GB2453929A - A coaxial spacer for a fluorescent lamp tube - Google Patents
A coaxial spacer for a fluorescent lamp tube Download PDFInfo
- Publication number
- GB2453929A GB2453929A GB0720128A GB0720128A GB2453929A GB 2453929 A GB2453929 A GB 2453929A GB 0720128 A GB0720128 A GB 0720128A GB 0720128 A GB0720128 A GB 0720128A GB 2453929 A GB2453929 A GB 2453929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spacer
- fluorescent lamp
- lamp tube
- sleeve
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 72
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000012858 resilient material Substances 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/06—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out ultraviolet radiation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/08—Lighting devices intended for fixed installation with a standard
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/04—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages the fastening being onto or by the light source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
A spacer 33 for spacing a cylindrical optical filter or sleeve 22 from a cylindrical fluorescent lamp tube 21, the spacer comprising a resilient, at least partially annular, member having an inner dimension arranged to form a friction fit with an outer diameter of the fluorescent lamp tube 21 and an outer diameter to form a sliding frictional fit with an inner diameter of the optical filter 22, wherein the spacer is sufficiently resilient to slide axially along the fluorescent lamp tube or to clip over the fluorescent lamp tube in a direction substantially orthogonal to a longitudinal axis of the fluorescent lamp tube.
Description
A COAXIAL SPACER
This invention relates to a coaxial spacer and in particular to a spacer to space a cylindrical sleeve or optical filter from a fluorescent lamp tube substantially coaxial with, and of smaller diameter than, the cylindrical sleeve or optical filter.
Referring to Figures Ia and I b, in a lamp fitting 10 it is known to fit a sleeve 12 over a fluorescent lamp tube 11, which sleeve has an internal diameter only just larger than an external diameter of the lamp so that the flexible sleeve 12 is adequately supported along its length by the fluorescent lamp tube. This sleeve is often of a coloured plastic material. Such sleeves form an optical filter for at least one of elimination of UV from light output from the fluorescent lamp tube or of colouring the light output and are normally made from polycarbonate, or a similar dyed material, to form sleeving which is fitted directly onto the lamp.
Such a close fitting sleeve tends thermally to insulate the lamp and in the case of small diameter fluorescent lamps, which tend to run at elevated temperatures compared with larger diameter lamps, as a result both the lamp and sleeve become heated above an optimum operating temperature, decreasing efficiency of the lamp. In addition, when using such close fitting sleeves over smaller diameter lamps, the smaller area of sleeve, and the higher luminous outputs of these smaller lamps compared with larger diameter lamps, produces a very high luminous flux density in the sleeve and an excessive power absorption density in the sleeve material. After extended use such small diameter sleeves are therefore prone to both blistering and deformation.
Thus problems that occur when applying the current technique to modem smaller diameter lamps, such as a currently popular T5 size, which are designed to run at higher temperatures than older T8 and T16 designs are: 1. that the filter tends thermally to insulate the lamp, 2. that the filter, which is designed to absorb energy from the light output, absorbs energy at a density which cannot easily be dissipated.
I
The result of these combined effects is that both lamp and filter or sleeve overheat and reach elevated temperatures which are damaging to the filter or sleeve substrate material and to the fluorescent lamp itself. This leads to a significantly shortened life expectancy from both the lamp and filter with the filter material visibly charring or blistering.
Diffusers are also known, for example of substantially U-shaped cross-section, having clips permanently fixed to the diffuser so that the diffuser can be clipped to a fluorescent lamp tUbe having a diameter similar to an internal maximum dimension of the diffuser. However, such diffusers do not completely surround a fluorescent lamp tube and therefore cannot be used to filter or colour substantially all light emitted from the fluorescent lamp and are liable to the same overheating problems if the diffuser forms a close fit to the fluorescent lamp tube.
It is an object of the present invention at least to ameliorate the aforesaid
shortcomings in the prior art.
According to the present invention there is provided a spacer for spacing a cylindrical optical filter or sleeve from a cylindrical fluorescent lamp tube, the spacer comprising a resilient, at least partially annular, member having an inner dimension arranged to form a friction fit with an outer diameter of the fluorescent lamp tube and an outer diameter to form a sliding frictional fit with an inner diameter of the optical filter or sleeve, wherein the spacer is sufficiently resilient to slide axially along the fluorescent lamp tube or to clip over the fluorescent lamp tube in a direction substantially orthogonal to a longitudinal axis of the fluorescent lamp tube.
Advantageously, friction between the spacer and the fluorescent lamp tube is arranged to be greater than friction between the spacer and the cylindrical optical filter.
Conveniently, the at least partially annular member comprises an opening smaller than the inner dimension which opening may be resiliently further opened to slide the spacer axially along the fluorescent lamp tube or for a portion of the fluorescent tube to pass through the opening in a direction substantially orthogonal to a longitudinal axis of the fluorescent lamp tube.
Optionally, the at least partially annular member comprises an annular member provided on an inner face thereof with a plurality of projections defining the inner dimension.
Conveniently, faces of the plurality of projections are arranged to be substantially tangential in use to an outer cylindrical face of the fluorescent lamp tube.
Conveniently, the spacer comprises a plurality of projections V-shaped in cross-section and joined substantially at an apex of the V-shaped cross-section to an inner face of the annular member.
Alternatively, inner portions of the plurality of projections are concavely arcuate and arranged to conform substantially to portions of the outer cylindrical face of the fluorescent lamp tube.
Conveniently, the spacer comprises three projections.
Conveniently, the spacer is stamped or cut from a sheet of metal, plastics or other sufficiently heat-tolerant and resilient material.
Advantageously, the plastics material is a polyamide.
Alternatively, the spacer is moulded from a plastics or other sufficiently heat-tolerant and resilient mouldable material.
Conveniently, the at least partially annular member is a double-walled, partial annulus formed from metal wire or tape.
Optionally, an inner wall of the double-walled annulus is provided with a gap therein substantially opposite the opening.
Optionally, an outer wall of the double-walled annulus is provided with a gap therein substantially opposite the opening.
Optionally, an outer wall of the double-walled annulus is provided with a gap therein proximate the opening.
Advantageously, the spacer comprises a flat coil spring having an outer coil with an outer diameter substantially conforming to an inner diameter of the cylindrical optical filter, an inner coil having an inner diameter substantially conforming to an external diameter of the fluorescent lamp tube and a member connecting the outer coil to the inner coil.
Conveniently, the coils are formed of metal or other sufficiently heat-tolerant and resilient material.
The invention will now be described, by way of example, with reference to the accompanying drawings in which: Figure la is an end view of a known fluorescent lamp tube and sleeve; Figure lb is a perspective view of the known fluorescent lamp tube and sleeve of Figure Ia; Figure 2a is an end view of a fluorescent lamp tube and sleeve with a spacer according to an embodiment of the invention; Figure 2b is a perspective view of the fluorescent lamp tube and sleeve with a spacer of Figure 2a; Figures 3a-3b are cross-sectional views of embodiments of spacers according to the invention comprising a clip, stamped or cut from sheet material or moulded; Figures 4a-4b are cross-sectional view of embodiments of spacers according to the invention each comprising a metal clip fabricated from metal wire or tape; and Figure 5 is a cross-sectional view of an embodiment of a spacer according to the invention comprising a wire or tape spiral.
In the Figures like reference numerals denote like parts.
Referring to Figures 2a and 2b, according to the invention there is provided a cylindrical spacer 33 having an inner diameter conforming to an external diameter of a fluorescent lamp tube 21 and an outer diameter conforming to an internal diameter of a sleeve 22.
A function of the spacer 33 is to support a large diameter tube on a smaller diameter tube. In a specific application for fluorescent lamp tubes, the inner glass tube 21 is not compliant whereas the outer sleeve 22 is both flexible and compliant and requires support. For these reasons the spacer 33 requires significant compliance at the inner diameter to fit over and grip the florescent lamp tube 21 whilst the outer diameter does not require significant compliance to fit and adequately support the outer sleeve 22.
Referring to Figures 3a -3b a first group of embodiments of a spacer according to the invention comprise a clip 31, 32, 33, either stamped or cut from sheet material or else moulded, in which an internal diameter fits over an external diameter of an inner tube, such as a fluorescent lamp tube, whilst an external diameter of the clip supports the outer tube or sleeve, such as an optical filter.
Referring to Figure 3a, a spacer according to the invention is a clip 31 essentially in the form of a partial annulus having an opening 313 in the partial annulus so that the partial annulus so formed is substantially similar in cross-section to an annular portion of a circlip. The spacer 31 has an inner diameter defined by an inner face 311 of the partially annular clip substantially equal to an external diameter of the fluorescent lamp tube 21 in order to grip the fluorescent lamp tube in use and an outer diameter, defined by an outer face 312 of the partially annular clip, arranged to be a sliding frictional fit with an inner diameter of a sleeve 22. The opening 313 is smaller than the inner diameter of the clip so that the annular clip may be resiliently further opened to slid over an end of, and axially along, the fluorescent lamp tube to a suitable position to support the sleeve. Alternatively, the clip may be sufficiently resilient that the clip may be clipped onto the fluorescent lamp tube in a direction substantially orthogonal to a longitudinal axis of the fluorescent lamp tube.
Referring to Figure 3b, a second embodiment of a spacer 32 according to the invention comprises in cross-section an annulus 324 with an outer diameter, defined by an outer face 322 of the annulus, arranged to be a sliding frictional fit with an inner diameter of a sleeve 22. Located within the annulus are three projections with a substantially V-shaped cross-section so spaced and shaped that arms of the V-shaped projections are arranged to form tangents to a fluorescent lamp tube having an external diameter to form a sliding fit between inner faces 321 of the tangential arms. It will be understood that a different number of projections could be used.
Referring to Figure 3c, a third embodiment of a spacer 33 according to the invention comprises in cross-section an annulus 334 with an outer diameter, defmed by an outer face 332 of the annulus, arranged to be a sliding frictional fit with an inner diameter of a sleeve 22. Located within the annulus are three projections with, in cross-section, concave inner faces 331 forming arcs concentric with the outer face 332, so spaced that the concave inner faces 331 form a sliding frictional fit with an external diameter of a fluorescent lamp tube 21. It will be understood that a different number of projections could be used.
It will be understood that the embodiments of Figures 3a -3c may be, for example, either stamped or laser cut from thin metal or plastic sheet material such as polyamide or moulded from a suitable heat resistant plastic material, for
example Nylon 66.
Referring to Figures 4a -4c further embodiments 41, 42, 43 of spacers according to the invention each comprise an annulus with an opening 413, 423, 433 respectively, similar in outline shape to the annulus of the first embodiment 31 of Figure 3a, formed from a metal clip fabricated from metal wire or tape. The metal wire or tape is formed into a double-walled annulus having an inner wall 411, 421, 431 respectively, arranged to clip over the external diameter of a fluorescent lamp tube 21 and an outer wall 412, 422, 432 respectively, having an outer diameter arranged to be a sliding fit with an inner diameter of a sleeve filter 22.
Referring to Figure 4a, a first such metal clip embodiment 41 has a break 414 in the inner wall 411 opposite the opening 413 to increase deformability of the spacer for clipping over, or sliding axially along, the fluorescent lamp tube 21.
Referring to Figure 4b, a second such metal clip embodiment 42 has a break 424 in the outer wall 422 opposite the opening 423 to increase deformability of the spacer for clipping over, or sliding axially along, the fluorescent lamp tube 21.
Referring to Figure 4c, a third such metal clip embodiment 43 has a break 434 in the outer wall 432 proximate one side of the opening 433 to increase deformability of the spacer for clipping over, or sliding axially along, the fluorescent lamp tube 21.
Referring to Figure 5, a further embodiment 51 of a spacer according to the invention comprises a wire or tape spiral incorporating an inner annular portion 511 having a diameter corresponding to an external diameter of a fluorescent lamp tube 21 and an outer annular portion 512 having a diameter corresponding to an internal diameter of a sleeve filter 22 wherein the inner annular portion 511 is connected to the outer annular portion 512 by a spiral portion 513 so that the spacer is in the form of a flat spiral metal spring with an internal diameter matching the external diameter of the fluorescent lamp tube and an outer diameter matching an internal diameter of the sleeve. It will be understood that the portion of the spacer connecting the inner annulus portion to the outer annulus portion may form more or less than one complete spiral or may be in some other non-spiral form which connects the two annuli. This embodiment is preferably fabricated from steel wire providing a spacer that has proved simplest and most cost efficient to manufacture while providing suitable compliance in both the internal and external diameters allowing for tolerances in the two spaced apart tubes with minimal visibility and optical effect on the lamp output.
In use a plurality of any of the spacers described above is used along the length of the fluorescent lamp tube to support the whole sleeve.
It will be understood that at least where the fluorescent tube is not to be used horizontally, the inner face of the spacer preferably is a frictional fit with the fluorescent tube and an outer face of the spacer a sliding frictional fit with the sleeve to allow assembly and disassembly of the fluorescent lamp tube, spacer and sleeve while maintaining the sleeve on the fluorescent lamp tube in use.
Moreover, friction between the spacer and the fluorescent lamp tube is preferably greater than friction between the spacer and the sleeve so that the spacers may first be mounted on the fluorescent lamp tube and the sleeve may subsequently be slid over the assembled spacers and fluorescent lamp tube. It will be understood that the assembly may be disassembled in a reverse process, in order, for example, to clean or replace the fluorescent lamp tube, or, for example, to change one colour filter for a filter of another colour.
The spacer allows the use of filters designed for use with lamps of a first diameter with lamps of a diameter smaller than the first diameter.
Using a larger diameter filter allows improved convection cooling of both the lamp and filter, and reduces the absorption energy density in the filter compared with use of a close-fitting filter or sleeve. As a result both lamp and filter operate at lower operating temperatures than they would with a close fitting sleeve.
Thus the advantages gained by use of the spacer of the invention to support a sleeve larger than a close-fitting sleeve over a high powered lamp are that both the larger sleeve and lamp can be better ventilated by allowing air to pass through the gap therebetween, and that a larger sleeve has in any case a higher contact area with the surrounding ambient air to improve heat dissipation. Furthermore, a luminous flux density arriving at the larger sleeve is much smaller than it would be at a smaller diameter sleeve giving rise to a much smaller power absorption density in the sleeve material. As a result, the lamp efficiency and lifetime is sustained by operating at more nonnal temperatures and the sleeve is no longer subject to blistering or deformation.
An important advantage of this invention is that it allows use of tubular optical filters over small diameter (T5) fluorescent lamps which are designed to run at higher temperatures than older, larger diameter fluorescent lamp designs.
Although the invention has been described in relation to linear fluorescent lamp tubes of circular cross-section and linear optical filters of circular cross-section, it will be understood that the invention has application to other shapes of fluorescent lamp tube and optical filter and other shaped cross-sections of fluorescent lamp tube and optical filter. For example, a spacer according to the invention need not provide an exactly coaxial positioning of the filter over the lamp, and could be used with a fluorescent lamp tube of circular cross-section and an optical filter with a square, rectangular or elliptical cross-section. The optical filter may also be arranged to act as an optical diffuser and may be substantially translucent or transparent to substantially all or part of the visible spectrum.
Claims (18)
- I. A spacer for spacing a cylindrical optical filter or sleeve from a cylindrical fluorescent lamp tube, the spacer comprising a resilient, at least partially annular, member having an inner dimension arranged to form a friction fit with an outer diameter of the fluorescent lamp tube and an outer diameter to form a sliding frictional fit with an inner diameter of the optical filter or sleeve, wherein the spacer is sufficiently resilient to slide axially along the fluorescent lamp tube or to clip over the fluorescent lamp tube in a direction substantially orthogonal to a longitudinal axis of the fluorescent lamp tube.
- 2. A spacer as claimed in claim 1, wherein friction between the spacer and the fluorescent lamp tube is arranged to be greater than friction between the spacer and the cylindrical optical filter.
- 3. A spacer as claimed in claims 1 or 2, wherein the at least partially annular member comprises an opening smaller than the inner dimension which opening may be resiliently further opened to slide the spacer axially along the fluorescent lamp tube or for a portion of the fluorescent tube to pass through the opening in a direction substantially orthogonal to a longitudinal axis of the fluorescent lamp tube.
- 4. A spacer as claimed in claim I or 2, wherein the at least partially annular member comprises an annular member provided on an inner face thereof with a plurality of projections defining the inner dimension.
- 5. A spacer as claimed in claim 4, wherein faces of the plurality of projections are arranged to be substantially tangential in use to an outer cylindrical face of the fluorescent lamp tube.
- 6. A spacer as claimed in claim 5, comprising a plurality of projections V-shaped in cross-section and joined substantially at an apex of the V-shaped cross-section to an inner face of the annular member.
- 7. A spacer as claimed in claim 4, wherein inner portions of the plurality of projections are concavely arcuate and arranged to conform substantially to portions of the outer cylindrical face of the fluorescent lamp tube.
- 8. A spacer as claimed in claims 6 or 7 comprising three projections.
- 9. A spacer as claimed in any of the preceding projections stamped or cut from a sheet of metal, plastics or other sufficiently heat-tolerant and resilient material.
- 10. A spacer as claimed in claim 9, wherein the plastics material is a polyamide.
- 11. A spacer as claimed in any of claims I to 8, moulded from a plastics or other sufficiently heat-tolerant and resilient mouldable material.
- 12. A spacer as claimed in claim 3, wherein the at least partially annular member is a double-walled partial annulus formed from metal wire or tape.
- 13. A spacer as claimed in claim 12, wherein an inner wall of the double-walled annulus is provided with a gap therein substantially opposite the opening.
- 14. A spacer as claimed in claim 12, wherein an outer wall of the double-walled annulus is provided with a gap therein substantially opposite the opening.
- 15. A spacer as claimed in claim 12, wherein an outer wall of the double-walled annulus is provided with a gap therein proximate the opening.
- 16. A spacer as claimed in claim 1, comprising a flat coil spring having an outer coil with an outer diameter substantially conforming to an inner diameter of the cylindrical optical filter or sleeve, an inner coil having an inner diameter substantially conforming to an outer diameter of the fluorescent lamp tube and a member connecting the outer coil to the inner coil.
- 17. A spacer as claimed in claim 16, wherein the coils are formed of metal or other sufficiently heat tolerant and resilient material.
- 18. A spacer substantially as described herein and as illustrated in any of Figures 2a to 5 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0720128A GB2453929A (en) | 2007-10-15 | 2007-10-15 | A coaxial spacer for a fluorescent lamp tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0720128A GB2453929A (en) | 2007-10-15 | 2007-10-15 | A coaxial spacer for a fluorescent lamp tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0720128D0 GB0720128D0 (en) | 2007-11-28 |
| GB2453929A true GB2453929A (en) | 2009-04-29 |
Family
ID=38813836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0720128A Withdrawn GB2453929A (en) | 2007-10-15 | 2007-10-15 | A coaxial spacer for a fluorescent lamp tube |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2453929A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120037151A1 (en) * | 2009-04-27 | 2012-02-16 | Mcentee Paul Thomas | Solar collector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3124307A (en) * | 1964-03-10 | Vapor lamp units | ||
| US3720826A (en) * | 1970-05-05 | 1973-03-13 | Westinghouse Electric Corp | Tubular electric discharge lamp with integral protective-insulating sleeve |
| DE3112962A1 (en) * | 1981-04-01 | 1982-10-14 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Luminaire for fluorescent lamps having a protective tube |
| DE3740701A1 (en) * | 1987-12-01 | 1989-06-15 | Trilux Lenze Gmbh & Co Kg Nehe | Luminaire with a fluorescent lamp |
| DE3837548A1 (en) * | 1988-11-04 | 1990-05-10 | Mellert Fa Hermann | Luminaire |
| US20060034087A1 (en) * | 2004-08-16 | 2006-02-16 | A.L.P. Lighting & Ceiling Products, Inc. | End cap for illumination tube guards |
-
2007
- 2007-10-15 GB GB0720128A patent/GB2453929A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3124307A (en) * | 1964-03-10 | Vapor lamp units | ||
| US3720826A (en) * | 1970-05-05 | 1973-03-13 | Westinghouse Electric Corp | Tubular electric discharge lamp with integral protective-insulating sleeve |
| DE3112962A1 (en) * | 1981-04-01 | 1982-10-14 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Luminaire for fluorescent lamps having a protective tube |
| DE3740701A1 (en) * | 1987-12-01 | 1989-06-15 | Trilux Lenze Gmbh & Co Kg Nehe | Luminaire with a fluorescent lamp |
| DE3837548A1 (en) * | 1988-11-04 | 1990-05-10 | Mellert Fa Hermann | Luminaire |
| US20060034087A1 (en) * | 2004-08-16 | 2006-02-16 | A.L.P. Lighting & Ceiling Products, Inc. | End cap for illumination tube guards |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120037151A1 (en) * | 2009-04-27 | 2012-02-16 | Mcentee Paul Thomas | Solar collector |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0720128D0 (en) | 2007-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |