US3898500A - Halogen type filament lamp containing phosphorus and nitrogen - Google Patents
Halogen type filament lamp containing phosphorus and nitrogen Download PDFInfo
- Publication number
- US3898500A US3898500A US395610A US39561073A US3898500A US 3898500 A US3898500 A US 3898500A US 395610 A US395610 A US 395610A US 39561073 A US39561073 A US 39561073A US 3898500 A US3898500 A US 3898500A
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- United States
- Prior art keywords
- envelope
- lamp
- halogen
- nitrogen
- halide
- 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.)
- Expired - Lifetime
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- 229910052736 halogen Inorganic materials 0.000 title claims abstract description 22
- 150000002367 halogens Chemical class 0.000 title claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 title claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 title claims description 8
- 239000011574 phosphorus Substances 0.000 title claims description 8
- 150000004820 halides Chemical class 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910052794 bromium Inorganic materials 0.000 claims description 15
- 229910052721 tungsten Inorganic materials 0.000 claims description 12
- 239000010937 tungsten Substances 0.000 claims description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 5
- 238000010494 dissociation reaction Methods 0.000 claims description 5
- 230000005593 dissociations Effects 0.000 claims description 5
- 238000005247 gettering Methods 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- 230000001172 regenerating effect Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229910021295 PNCl2 Inorganic materials 0.000 claims 4
- 101100381452 Panax ginseng OSCPNY2 gene Proteins 0.000 claims 1
- 239000002904 solvent Substances 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 10
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 9
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 150000001649 bromium compounds Chemical class 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 241000237519 Bivalvia Species 0.000 description 1
- 108091006473 SLC25A33 Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 102100033827 Solute carrier family 25 member 33 Human genes 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- 235000020639 clam Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012442 inert solvent Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000012454 non-polar solvent Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- -1 tungsten halogen Chemical class 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/50—Selection of substances for gas fillings; Specified pressure thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- halide can'be introduced into the lamp envelope in so- UNITED STATES PATENTS lution, the solvent being evaporated thereafter to 674,754 5/1901 Blau 313/222 X leave the halide as a residue 1,249,978 12/1917 MacKay 313/222 X 1.925.857 9/1933 van Liempt 313/222 x 4 Clams, 1 Drawmg Flgure PATENTEU M18 W5 ATTORNEY HALOGEN TYPE FILAMENT LAMP CONTAINING PHOSPIIORUS AND NITROGEN This is a continuation of application Ser. No. 1,404, filed on Jan. 8, 1970, now abandoned.
- the present invention relates to tungsten-halogen cycle electric incandescent lamps.
- a halogen element which acts in association with tungsten vapour evaporated from the filament, to minimise deposition of tungsten on the envelope wall.
- the present invention provides a means whereby the halogen can be introduced as a substance which remains inert during lamp processing, but releases a predetermined quantity of halogen and provides a gettering action upon thermal dissociation.
- a tungsten-halogen cycle electric incandescent lamp having a fill including a phosphonitrilic halide.
- Mixtures of phosphonitrilic halides having different halogen atoms and/or different number of (PNY units, where Y is the halogen, in the molecule may be employed, such as a mixture of (PNBr and (PNBr
- the phhosphonitrilic halides can be prepared by conventional techniques.
- the halides are stable at room temperature. However, they can be dissociated into their elements by heating within the lamp envelope, for example by operating the lamp.
- the halogen supports the regenerative cycle, and the phosphorus provides a gettering action.
- the phosphorus serves a function similar to that of hydrogen, when the halogen is bromine, in that it inhibits the reaction between bromine and the tungsten filament, but the disadvantage of a short lamp life resulting from loss of hydrogen by diffusion is avoided.
- the phosphonitrilic halides can be dissolved in inert solvents, preferably non-polar solvents such as benzene, ether, petroleum ether and chlorinated hydrocarbons, and can thus be introduced into the lamp envelope as a solution, for example by injection onto the filament or envelope wall, facilitating close control of the quantity of halide introduced.
- the solvent can be evaporated from the envelope, e.g. under a vacuum, leaving the halide-as a residue; Y
- EXAMPLE III In making a 12v. 55w. compact car lamp having an internal volume of 0.65 cc.s approximately the procedure of Example I was followed except that 0.05 cc.s of a solution in petroleum ether of a mixture of (PNCI L, (PNC1 PNCI and (PNCI containing 0.05 g. of the mixture per cc.s of solution was injected into the lamp envelope instead of the solution of mixed phosphonitrilic bromides.
- Example III The solution used in Example III has been found to be particularly well suited for lamps having a loading of less than 20w./cm. of internal envelope wall area.
- the procedures for making lamps according to the invention as described in the examples are more similar to those for making conventional electric incandescent lamps, because of the gettering action of the phosphorus released on dissociation of the halides.
- a lower standard deviation in the lamp life may also be achieved.
- a longer lamp life may be obtained.
- the present invention also allows use of useof less expensive materials, containing greater amounts of impurities than were hitherto practicable, to be used for the lamp envelopes, as for example high melting point glasses, or Vycor (approximately 96 percent silicon glass), instead of the more usual high purity fused silica envelopes.
- the accompanying drawing illustrates an example of one form of lamp prepared as described in Example 1.
- the lamp has a high melting point glass envelope 1 provided with an aperture 2 through which the lamp was exhausted and filled.
- the lamp was thereafter sealed by sealing off an exhaust tube 3 with which the aperture 2 is provided.
- the envelope has two lead-in wires 4 sealed therethrough, connected to a tungsten filament 5.
- An electric incandescent lamp comprising: a closed light-transmitting envelope of a high temperature-resisting material; electrically-conducting lead-in wires sealed through said envelope; a tungsten filament inside said envelope connected to said lead-in wires; and a fill inside said envelope comprising an inert gas and the products resulting from the thermal dissociation of a phosphonitrilic halide comprising (PNY where n is an integer and Y is Br or Cl, said fill thereby releasing a predetermined amount of said Br or C1 to produce a regenerative cycle and releasing a predetermined amount of said P to produce a gettering action and to inhibit the reaction of said Br and Cl with said tungsten filament.
- a lamp according to claim 1 wherein said phosphonitrilic halide includes a mixture of (PNBr and (PNBr- 3.
- a lamp according to claim 1 wherein said phosphonitrilic halide includes a mixture of (PNCI (PNCl (PNCl and (PNCl 4.
- An electric incandescent lamp comprising: a closed light transmitting envelope of a high temperature-resisting material; electrically-conducting lead-in wires sealed through said envelope; a tungsten filament inside said envelope connected to said lead-in wires; and a fill comprising an inert gas and nitrogen, phosphorus and a halogen, said nitrogen, phosphorus and halogen having being formed by thermal dissociation of a phosphonitrilic halide.
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- Discharge Lamp (AREA)
Abstract
A tungsten-halogen cycle electric incandescent lamp has a fill including a phosphonitrilic halide. Mixtures of more than one of the halides may be employed. The halide can be introduced into the lamp envelope in solution, the solvent being evaporated thereafter to leave the halide as a residue.
Description
United States Patent Johnston et al. 1 1 Aug. 5, 197 5 15 1 HALOGEN TYPE FILAMENT LAMP 2,882,435 4/1959 Millner et a1. 313/222 CONTAINING AND 2.928977 3/1960 ROth et al. 313/222 NITROGEN 3,311,777 3/1967 Schroder 313/222 X 3,465,193 9/1969 Beuvens et al.... 313/174 X [75] Inventors; Robert Bernard Johnston; John 3,712,701 1/1973 Johnston et a1 313/222 X g i i Rees both of FOREIGN PATENTS OR APPLICATIONS an 763,062 7/1967 Canada 313/222 173] AssIgnee: Thorn Electrlcal Industnes LImIted, OTHER PUBUCATIONS London, England Chem1cal Abstracts, Jam-June, 1967,-Formula Index, [22] Filed: Sept. 10, 1973 VOL 66, 950]; [2]] App} 395 0 Chemical Abstracts, Jan..1une, 1967,Formula Index,
Vol. 66, p. 12F. Related US. Application Data Continuation of S812 N0. 1,404, Jan. 8, 1970, Primary Examiner palmer Demeo abandoned- Attorney, Agent, or FirmRobert F. OConnell [52] US. Cl 313/174; 313/222 [57] ABSTRACT [51] Int. Cl H01 61/26; HOlk 1/50 A tungsten halogen cycle electric incandescent p 174 22 2 [58] Fleld of Search 2 23 has a fill mcludmg a phosphomtrlllc hallde. MIxtures [56] References Cited of more than one of the halides may be employed. The
halide can'be introduced into the lamp envelope in so- UNITED STATES PATENTS lution, the solvent being evaporated thereafter to 674,754 5/1901 Blau 313/222 X leave the halide as a residue 1,249,978 12/1917 MacKay 313/222 X 1.925.857 9/1933 van Liempt 313/222 x 4 Clams, 1 Drawmg Flgure PATENTEU M18 W5 ATTORNEY HALOGEN TYPE FILAMENT LAMP CONTAINING PHOSPIIORUS AND NITROGEN This is a continuation of application Ser. No. 1,404, filed on Jan. 8, 1970, now abandoned.
The present invention relates to tungsten-halogen cycle electric incandescent lamps.
In operation of these lamps a halogen element,'usually either bromine or iodine acts in association with tungsten vapour evaporated from the filament, to minimise deposition of tungsten on the envelope wall.
While allowing the use of compact and mechanically strong lamp envelopes, permitting pressure filling to several atmospheres, and increased filament life, these lamps are more difficult to produce than conventional incandescent lamps. Under therelatively high-temperatures of operation of these lamps, impurities can be released which interfere with efficient working but it is difficult to introduce a getter for impurities which will remain active after lamp processing but not interfere with the regenerative cycle. Furthermore, whereas close control of the quantityof halogenpresent is necessary in order to achieve optimum efficiency of the regenerative cycle, in known methods losses of halogen can occur either through evaporation or by chemical reaction or physical absorption either before or during lamp processing after introduction of the halogen.
The present invention provides a means whereby the halogen can be introduced as a substance which remains inert during lamp processing, but releases a predetermined quantity of halogen and provides a gettering action upon thermal dissociation.
According to the present invention there is provided a tungsten-halogen cycle electric incandescent lamp having a fill including a phosphonitrilic halide.
Mixtures of phosphonitrilic halides having different halogen atoms and/or different number of (PNY units, where Y is the halogen, in the molecule may be employed, such as a mixture of (PNBr and (PNBr The phhosphonitrilic halides can be prepared by conventional techniques.
The halides are stable at room temperature. However, they can be dissociated into their elements by heating within the lamp envelope, for example by operating the lamp. The halogen supports the regenerative cycle, and the phosphorus provides a gettering action.
Before the present invention, in the case of lamps having a fill including elementary bromine, precise control of the quantity of bromine was necessary in order to avoid corrosion of the tungsten filament by excess bromine, which would lead to lamp failure. Although corrosion could be reduced by introducing hydrogen with the bromine, as for example as hydrogen bromine or as CHBr Cl-l Br or C HgBI', the hydrogen tended to diffuse through the fused silica of the envelope, leading to the formation of an excess of bromine. In the present invention, the phosphorus serves a function similar to that of hydrogen, when the halogen is bromine, in that it inhibits the reaction between bromine and the tungsten filament, but the disadvantage of a short lamp life resulting from loss of hydrogen by diffusion is avoided.
The phosphonitrilic halides can be dissolved in inert solvents, preferably non-polar solvents such as benzene, ether, petroleum ether and chlorinated hydrocarbons, and can thus be introduced into the lamp envelope as a solution, for example by injection onto the filament or envelope wall, facilitating close control of the quantity of halide introduced. The solvent can be evaporated from the envelope, e.g. under a vacuum, leaving the halide-as a residue; Y
' For example a solution of a mixtureof trimeric and tetrameric bromides, eg in benzene or a solution of a mixture of (PNCI2)4, and eg in petroleum ether can be used.
The following are some examples of methods of making lamps in accordance with the present invention.
1 EXAMPLE 1 In making a 12v. 100 w. compact projection lamp having an internal volume of 0.65 cc.s approximately,
arid 0.035cc.s of the solution was injected into the lamp -'en\ elope. An exhaust/gas-filling apparatus was connec'ted to'the exhaust tube and the envelope was evacuated, flushed with nitrogen and heated to a low temperature (about 150C) to evaporate the solvent of the solution. Thereafter the envelope was filled with an inert gas e.g. N Ar, Kr or Xe to the required pressure in the conventional manner and the exhaust tube was sealed.
EXAMPLE II In making a 12v. 55 w. compact car lamp having an internal volume of 0.65 cc.s approximately the procedure of Example I was followed except that 0.024 cc.s of the solution was injected into the lamp envelope.
EXAMPLE III In making a 12v. 55w. compact car lamp having an internal volume of 0.65 cc.s approximately the procedure of Example I was followed except that 0.05 cc.s of a solution in petroleum ether of a mixture of (PNCI L, (PNC1 PNCI and (PNCI containing 0.05 g. of the mixture per cc.s of solution was injected into the lamp envelope instead of the solution of mixed phosphonitrilic bromides.
The solution used in Example III has been found to be particularly well suited for lamps having a loading of less than 20w./cm. of internal envelope wall area.
In the method described in the Examples the exhaust- /gas filling system is not exposed to the corrosive action of halogens. Thus the need for the usual corrosionresistant materials and frequent maintainance of the system can be avoided. In addition, the disadvantage of halogen-degradation of the lubricants employed, leading to a reduction in the life of the vacuum pumps, can be avoided.
Whereas before the present invention specialised procedures for handling and processing the components for tungsten-halogen lamps were required, the procedures for making lamps according to the invention as described in the examples are more similar to those for making conventional electric incandescent lamps, because of the gettering action of the phosphorus released on dissociation of the halides. As a result of the accuracy with which the halogen can be introduced, a lower standard deviation in the lamp life may also be achieved. In addition, a longer lamp life may be obtained. The present invention also allows use of useof less expensive materials, containing greater amounts of impurities than were hitherto practicable, to be used for the lamp envelopes, as for example high melting point glasses, or Vycor (approximately 96 percent silicon glass), instead of the more usual high purity fused silica envelopes.
The accompanying drawing illustrates an example of one form of lamp prepared as described in Example 1. Referring to the drawing, the lamp has a high melting point glass envelope 1 provided with an aperture 2 through which the lamp was exhausted and filled. The lamp was thereafter sealed by sealing off an exhaust tube 3 with which the aperture 2 is provided. The envelope has two lead-in wires 4 sealed therethrough, connected to a tungsten filament 5.
We claim:
1. An electric incandescent lamp comprising: a closed light-transmitting envelope of a high temperature-resisting material; electrically-conducting lead-in wires sealed through said envelope; a tungsten filament inside said envelope connected to said lead-in wires; and a fill inside said envelope comprising an inert gas and the products resulting from the thermal dissociation of a phosphonitrilic halide comprising (PNY where n is an integer and Y is Br or Cl, said fill thereby releasing a predetermined amount of said Br or C1 to produce a regenerative cycle and releasing a predetermined amount of said P to produce a gettering action and to inhibit the reaction of said Br and Cl with said tungsten filament.
2. A lamp according to claim 1 wherein said phosphonitrilic halide includes a mixture of (PNBr and (PNBr- 3. A lamp according to claim 1 wherein said phosphonitrilic halide includes a mixture of (PNCI (PNCl (PNCl and (PNCl 4. An electric incandescent lamp comprising: a closed light transmitting envelope of a high temperature-resisting material; electrically-conducting lead-in wires sealed through said envelope; a tungsten filament inside said envelope connected to said lead-in wires; and a fill comprising an inert gas and nitrogen, phosphorus and a halogen, said nitrogen, phosphorus and halogen having being formed by thermal dissociation of a phosphonitrilic halide.
Claims (4)
1. An electric incandescent lamp comprising: a closed light-transmitting envelope of a high temperature-resisting material; electrically-conducting lead-in wires sealed through said envelope; a tungsten filament inside said envelope connected to said lead-in wires; and a fill inside said envelope comprising an inert gas and the products resulting from the thermal dissociation of a phosphonitrilic halide comprising (PNY2)n, where n is an integer and Y is Br or Cl, said fill thereby releasing a predetermined amount of said Br or Cl to produce a regenerative cycle and releasing a predetermined amount of said P to produce a gettering action and to inhibit the reaction of said Br and Cl with said tungsten filament.
2. A lamp according to claim 1 wherein said phosphonitrilic halide includes a mixture of (PNBr2)3 and (PNBr2)4.
3. A lamp according to claim 1 wherein said phosphonitrilic halide includes a mixture of (PNCl2)4, (PNCl2)5, (PNCl2)6, and (PNCl2)7.
4. AN ELECTRIC INCANDESCENT LAMP COMPRISING A CLOSED LIGHT TRANSMITTING ENVELOPE OF A HIGH TEMPERATURE-RESISTING MATERIAL, ELECTRICALLY-CONDUCTING LEAD-IN-WIRES SEALED THROUGH SAID ENVELOPE, A TUNGSTEN FILAMENT INSIDE SAID ENVELOPE CONNECTED TO SAID LEAD-IN WIRES, AND A FILL COMPRISING AN INERT GAS AND NITROGEN, PHOSPHORUS AND A HALOGEN, SAID NITROGEN, PHOSPHORUS AND HALOGEN HAVING BEING FORMED BY THERMAL DISSOCIATON OF A PHOSPHONITRILLIC HALIDE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US395610A US3898500A (en) | 1970-01-08 | 1973-09-10 | Halogen type filament lamp containing phosphorus and nitrogen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US140470A | 1970-01-08 | 1970-01-08 | |
| US395610A US3898500A (en) | 1970-01-08 | 1973-09-10 | Halogen type filament lamp containing phosphorus and nitrogen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3898500A true US3898500A (en) | 1975-08-05 |
Family
ID=26668986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US395610A Expired - Lifetime US3898500A (en) | 1970-01-08 | 1973-09-10 | Halogen type filament lamp containing phosphorus and nitrogen |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3898500A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4032808A (en) * | 1975-04-12 | 1977-06-28 | U.S. Philips Corporation | Electric incandescent lamp |
| US4039879A (en) * | 1975-10-07 | 1977-08-02 | U.S. Philips Corporation | Electric tungsten/bromine cycle lamp and method of manufacturing said lamp |
| US4099081A (en) * | 1976-02-25 | 1978-07-04 | Thorn Electrical Industries Limited | Electric lamps and their production |
| US4185922A (en) * | 1977-01-17 | 1980-01-29 | Thorn Electrical Industries Limited | Method of introducing fluorine into a lamp |
| EP0068655A2 (en) * | 1981-06-23 | 1983-01-05 | THORN EMI plc | Tungsten halogen incandescent lamps and mixed filling of gas and halogen compounds |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US674754A (en) * | 1901-01-02 | 1901-05-21 | Fritz Blau | Manufacture of electric glow-lamps. |
| US1249978A (en) * | 1913-09-08 | 1917-12-11 | Gen Electric | Incandescent lamp. |
| US1925857A (en) * | 1930-01-22 | 1933-09-05 | Gen Electric | Electric incandescent lamp |
| US2882435A (en) * | 1956-12-26 | 1959-04-14 | Egyesuelt Izzolampa | Gas-filled electric incandescent lamp |
| US2928977A (en) * | 1958-12-19 | 1960-03-15 | Gen Electric | Incandescent lamp |
| US3311777A (en) * | 1963-03-28 | 1967-03-28 | Philips Corp | Incandescent lamp including a fluorine gas atmosphere and a solid fluorinating agent |
| US3465193A (en) * | 1966-09-15 | 1969-09-02 | Philips Corp | Incandescent lamp containing a getter for binding water vapor |
| US3712701A (en) * | 1971-08-27 | 1973-01-23 | British Lighting Ind Ltd | Electric incandescent lamps |
-
1973
- 1973-09-10 US US395610A patent/US3898500A/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US674754A (en) * | 1901-01-02 | 1901-05-21 | Fritz Blau | Manufacture of electric glow-lamps. |
| US1249978A (en) * | 1913-09-08 | 1917-12-11 | Gen Electric | Incandescent lamp. |
| US1925857A (en) * | 1930-01-22 | 1933-09-05 | Gen Electric | Electric incandescent lamp |
| US2882435A (en) * | 1956-12-26 | 1959-04-14 | Egyesuelt Izzolampa | Gas-filled electric incandescent lamp |
| US2928977A (en) * | 1958-12-19 | 1960-03-15 | Gen Electric | Incandescent lamp |
| US3311777A (en) * | 1963-03-28 | 1967-03-28 | Philips Corp | Incandescent lamp including a fluorine gas atmosphere and a solid fluorinating agent |
| US3465193A (en) * | 1966-09-15 | 1969-09-02 | Philips Corp | Incandescent lamp containing a getter for binding water vapor |
| US3712701A (en) * | 1971-08-27 | 1973-01-23 | British Lighting Ind Ltd | Electric incandescent lamps |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4032808A (en) * | 1975-04-12 | 1977-06-28 | U.S. Philips Corporation | Electric incandescent lamp |
| US4039879A (en) * | 1975-10-07 | 1977-08-02 | U.S. Philips Corporation | Electric tungsten/bromine cycle lamp and method of manufacturing said lamp |
| US4099081A (en) * | 1976-02-25 | 1978-07-04 | Thorn Electrical Industries Limited | Electric lamps and their production |
| US4185922A (en) * | 1977-01-17 | 1980-01-29 | Thorn Electrical Industries Limited | Method of introducing fluorine into a lamp |
| EP0068655A2 (en) * | 1981-06-23 | 1983-01-05 | THORN EMI plc | Tungsten halogen incandescent lamps and mixed filling of gas and halogen compounds |
| EP0068655A3 (en) * | 1981-06-23 | 1983-07-27 | Thorn Emi Plc | Tungsten halogen incandescent lamps - mixed halogens |
| US4532455A (en) * | 1981-06-23 | 1985-07-30 | Thorn Emi Plc | Tungsten halogen incandescent lamps containing mixed halogens |
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