US2831242A - Sintered electric resistance heating element - Google Patents
Sintered electric resistance heating element Download PDFInfo
- Publication number
- US2831242A US2831242A US344666A US34466653A US2831242A US 2831242 A US2831242 A US 2831242A US 344666 A US344666 A US 344666A US 34466653 A US34466653 A US 34466653A US 2831242 A US2831242 A US 2831242A
- Authority
- US
- United States
- Prior art keywords
- molybdenum
- oxide
- silicon
- aluminum
- heating element
- 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
Links
- 238000010438 heat treatment Methods 0.000 title description 12
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims description 12
- 239000011733 molybdenum Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 8
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 4
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 claims description 3
- 229910000951 Aluminide Inorganic materials 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 claims description 3
- 229910021343 molybdenum disilicide Inorganic materials 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 claims description 3
- 229910003452 thorium oxide Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- HMPVUDRACAQMSH-UHFFFAOYSA-N [Al].[Mo].[Mo].[Mo] Chemical compound [Al].[Mo].[Mo].[Mo] HMPVUDRACAQMSH-UHFFFAOYSA-N 0.000 description 6
- 229910021344 molybdenum silicide Inorganic materials 0.000 description 6
- 238000007792 addition Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000004014 plasticizer Substances 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- ZXTFQUMXDQLMBY-UHFFFAOYSA-N alumane;molybdenum Chemical compound [AlH3].[Mo] ZXTFQUMXDQLMBY-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910016006 MoSi Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- -1 molybdenum-silicon-aluminum Chemical compound 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical class [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910052851 sillimanite Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/148—Silicon, e.g. silicon carbide, magnesium silicide, heating transistors or diodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/018—Heaters using heating elements comprising mosi2
Definitions
- This invention relates to materials which exhibit strength and oxidation resistance at high temperatures and are particularly suited for resistor heating elements that can be operated without protective atmosphere and have a surprisingly high service life also in oxidizing atmospheres.
- materials consisting of molybdenum, silicon and, if desired, further additions, meet these requirements.
- a heating element ofthe outlined requirements may consist, for instance, of molybdenum silicides; and particularly advantageous are compositions of the ternary system, molybdenum-silicon-aluminum.
- the heating element may be composed, for instance, of molybdenum silicides and molybdenum aluminides; or of molybdenum-silicon and molybdenum-aluminum alloys; or of a molybdenum, molybdenum-silicon or molybdenum-aluminum skeleton infiltrated with an aluminum-silicon alloy; or of molybdenum aluminide and silicon.
- porous bodies of molybdenum or molybdenum-silicon or molybdenum-aluminum pre-alloys and to infiltrate these bodies with aluminum-silicon alloys.
- Molybdenum-silicide of the composition MoSi is prepared, either by melting or by hot-pressing, and pulverized. After addition of a plasticizer, the silicide is extruded to form rods or tubes. The plasticizer is volatilized by heating and the compacts are then annealed (sintered) in a high-frequency furnace for 1-2 hours.
- the sintered materials thus prepared have metallic conductivity, satisfactory strength and very high oxidation resistance.
- a material on molybdenum silicide-molybdenum aluminide basis is prepared in the following manner: About 5% of molybdenum aluminide is added to molybdenum silicide. The mixture is compacted in the presence of a plasticizer. After volatilization of the plasticizer at red heat, the compact is presintered at 1100 C. and then subjected'to a final sintering process by direct passage of current through the compact in vacuum or in reducing or oxidizing atmosphere.
- protective layers containing aluminum oxide is seen in the formation of compositions of mullite or sillimanite character.
- the following example refers to the production of heating elements having a protective layer of this type.
- the ends of the tube-shaped heating elements Prior to the final sintering operation, the ends of the tube-shaped heating elements are suitably inserted in terminal tubes of increased thickness; sintering then provides bonding between the terminals and the ends of the heatides which become conducting at high temperatures, such as zirconium oxide and thorium oxide, as well as with additions which are practically non-coductive at high temperatures, such as aluminum oxide, beryllium oxide and silicon oxide.
- high temperatures such as zirconium oxide and thorium oxide
- additions which are practically non-coductive at high temperatures such as aluminum oxide, beryllium oxide and silicon oxide.
- the choice of the oxide to be added is dictated by the intended use of the elements.
- a mixture of parts of molybdenum silicides, 10 parts of molybdenum aluminide and 30 parts of zirconium oxide is filled in a graphite die of cylindrical cross-section, the die than being introduced into a hot press where the charge is heated to 1400 C. under application of a pressure of l50200 kg./cm.
- the die may be heated by a high-frequency field or by utilizing the graphite punches of the press for resistance heating.
- the scope of the invention is not limited to molybdenum alloys;
- the molybdenum may be partly replaced by other refractory metals such as tungsten, tantalum,
- an elongated heater resistance body formed by sintering at an elevated temperature particles of its constituents, which constituents consist essentially of 60 to 70 parts by weight of molybdenum and silicon in proportions present in molybdenum disilicide, and 10 to 30 parts by weight of molybdenum and aluminum in proportions present in molybdenum aluminide (MoAl said constituents containing also up to 30% by weight of a refractory oxide selected from the group consisting of zirconium oxide, thorium oxide, aluminum oxide, beryllium oxide, silicon oxide, and mixtures of said oxides.
- a heater device as claimed in claim 1 having a resistance body which consists essentially of about 70% of molybdenum and silicon in the proportions present in molybdenum disilicide and about 30% of aluminum and additional molybdenum in the proportions present in molybdenum aluminide (MoAl 3.
Landscapes
- Resistance Heating (AREA)
- Ceramic Products (AREA)
Description
SINTERED ELECTRIC RESISTANCE HEATING ELEMENT Richard A. Kielfer, Camillo Konopicky, and Friedrich Benesovsky, Reutte, Tirol, Austria, assignors to Schwarzkopf Development Corporation, a corporation of Maryland No Drawing. Application March 25, 1953 Serial No. 344,666
4 Claims. (Cl; 29-1825) This invention relates to materials which exhibit strength and oxidation resistance at high temperatures and are particularly suited for resistor heating elements that can be operated without protective atmosphere and have a surprisingly high service life also in oxidizing atmospheres.
According to the invention, materials consisting of molybdenum, silicon and, if desired, further additions, meet these requirements.
According to the invention, a heating element ofthe outlined requirements may consist, for instance, of molybdenum silicides; and particularly advantageous are compositions of the ternary system, molybdenum-silicon-aluminum. Accordingly, the heating element may be composed, for instance, of molybdenum silicides and molybdenum aluminides; or of molybdenum-silicon and molybdenum-aluminum alloys; or of a molybdenum, molybdenum-silicon or molybdenum-aluminum skeleton infiltrated with an aluminum-silicon alloy; or of molybdenum aluminide and silicon.
Heating elements, according to the invention, may be fabricated by any of the methods known to the art. It is thus possible to prepare heating elements in the form of tubes or loops by casting. It appears, however, preferable to prepare the elements by techniques of powder metallurgy; for instance, by extrusion followed by sintering and, if desired, under application of pressure during sintering.
It is also possible to prepare porous bodies of molybdenum or molybdenum-silicon or molybdenum-aluminum pre-alloys and to infiltrate these bodies with aluminum-silicon alloys.
The following examples will clarify the principle of the invention:
Molybdenum-silicide of the composition MoSi is prepared, either by melting or by hot-pressing, and pulverized. After addition of a plasticizer, the silicide is extruded to form rods or tubes. The plasticizer is volatilized by heating and the compacts are then annealed (sintered) in a high-frequency furnace for 1-2 hours. The sintered materials thus prepared have metallic conductivity, satisfactory strength and very high oxidation resistance.
A material on molybdenum silicide-molybdenum aluminide basis is prepared in the following manner: About 5% of molybdenum aluminide is added to molybdenum silicide. The mixture is compacted in the presence of a plasticizer. After volatilization of the plasticizer at red heat, the compact is presintered at 1100 C. and then subjected'to a final sintering process by direct passage of current through the compact in vacuum or in reducing or oxidizing atmosphere.
It is recommended to subject the heating element, prior to service, to a short-time treatment in an oxidizing at mosphere in order to form an adherent and gas-impervious protective layer. This is particularly recommended when the final sintering operation has been performed in a non-oxidizing atmosphere. After an insignificant volatilization of small amounts of molybdenum trioxide, this 2,831,242 Patented Apr. 22, 1958 V "ice ing from the aluminides as well as lower molybdenum oxides take part in the formation of the adherent protective layer.
The advantage of protective layers containing aluminum oxide is seen in the formation of compositions of mullite or sillimanite character. The following example refers to the production of heating elements having a protective layer of this type.
70 parts of molybdenum silicide and 30 parts of molybdenum aluminide of the approximate composition MoAl are mixed and hydrostatically compacted to the shape of tubes. The compacts are pre-heated, in carbon dioxide, at 1200 C., and finally sintered by direct passage of current at about 1600 C. (Throughout the specification and claims, all proportions are by weight, unless otherwise specifically stated.)
Prior to the final sintering operation, the ends of the tube-shaped heating elements are suitably inserted in terminal tubes of increased thickness; sintering then provides bonding between the terminals and the ends of the heatides which become conducting at high temperatures, such as zirconium oxide and thorium oxide, as well as with additions which are practically non-coductive at high temperatures, such as aluminum oxide, beryllium oxide and silicon oxide. The choice of the oxide to be added is dictated by the intended use of the elements.
The use of oxide additions is illustrated by the following example:
A mixture of parts of molybdenum silicides, 10 parts of molybdenum aluminide and 30 parts of zirconium oxide is filled in a graphite die of cylindrical cross-section, the die than being introduced into a hot press where the charge is heated to 1400 C. under application of a pressure of l50200 kg./cm. The die may be heated by a high-frequency field or by utilizing the graphite punches of the press for resistance heating. v
The scope of the invention is not limited to molybdenum alloys; The molybdenum may be partly replaced by other refractory metals such as tungsten, tantalum,
. niobium or chromium.
We claim:
1. In an electric heater device, an elongated heater resistance body formed by sintering at an elevated temperature particles of its constituents, which constituents consist essentially of 60 to 70 parts by weight of molybdenum and silicon in proportions present in molybdenum disilicide, and 10 to 30 parts by weight of molybdenum and aluminum in proportions present in molybdenum aluminide (MoAl said constituents containing also up to 30% by weight of a refractory oxide selected from the group consisting of zirconium oxide, thorium oxide, aluminum oxide, beryllium oxide, silicon oxide, and mixtures of said oxides.
2. In a heater device as claimed in claim 1, having a resistance body which consists essentially of about 70% of molybdenum and silicon in the proportions present in molybdenum disilicide and about 30% of aluminum and additional molybdenum in the proportions present in molybdenum aluminide (MoAl 3. Ina heater device as claimed in claim 1, having a resistance body which consists essentially of about 60% of molybdenum and silicon in the proportions found in Heany -2 Jan. 29, 1907 4 Linz July 21, Linz May 7, Stern Sept. 4, Goetzel et a1 Jan. 1, Briney Nov. 25, Beidler Jan. 12,
FOREIGN PATENTS Australia Aug. 10,
OTHER REFERENCES Mellor: Comprehensive Treatise on Inorganic and Theoretical Chemistry, vol. 11, page 523; pub. by Longmans, Green and Co., N. Y.
Claims (1)
1. IN AN ELECTRIC HEATER DEVICE, AN ELONGATED HEATER RESISTANCE BODY FORMED BY SINTERING AT AN ELEVATED TEMPERATURE PARTICLES OF ITS CONSTITUENTS, WHICH CONSTITUENTS CONSIST ESSENTIALLY OF 60 TO 70 PARTS BY WEIGHT OF MOLYBDENUM AND SILICON IN PROPORTIONS PRESENT IN MOLYBDENUM DISILICIDE, AND 10 TO 30 PARTS BY WEIGHT OF MOLYBEDENUM AND ALUMINUM IN PROPORTIONS PRESENT IN MOLYBEDENUM ALUMINIDE (MOAL5), SAID CONSTITUENTS CONTAINING ALSO UP TO 30% BY WEIGHT OF A REFRACTORY OXIDE SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM OXIDE, THORIUM OXIDE, ALUMINUM OXIDE, BERYLLIUM OXIDE, SILICON OXIDE, AND MIXTURES OF SAID OXIDES.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US344666A US2831242A (en) | 1953-03-25 | 1953-03-25 | Sintered electric resistance heating element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US344666A US2831242A (en) | 1953-03-25 | 1953-03-25 | Sintered electric resistance heating element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2831242A true US2831242A (en) | 1958-04-22 |
Family
ID=23351466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US344666A Expired - Lifetime US2831242A (en) | 1953-03-25 | 1953-03-25 | Sintered electric resistance heating element |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2831242A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3297487A (en) * | 1964-10-16 | 1967-01-10 | Du Pont | Fuel cell |
| US20100268214A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Surgical tool with inductively heated regions |
| US8617151B2 (en) | 2009-04-17 | 2013-12-31 | Domain Surgical, Inc. | System and method of controlling power delivery to a surgical instrument |
| US8858544B2 (en) | 2011-05-16 | 2014-10-14 | Domain Surgical, Inc. | Surgical instrument guide |
| US8915909B2 (en) | 2011-04-08 | 2014-12-23 | Domain Surgical, Inc. | Impedance matching circuit |
| US8932279B2 (en) | 2011-04-08 | 2015-01-13 | Domain Surgical, Inc. | System and method for cooling of a heated surgical instrument and/or surgical site and treating tissue |
| US9078655B2 (en) | 2009-04-17 | 2015-07-14 | Domain Surgical, Inc. | Heated balloon catheter |
| US9107666B2 (en) | 2009-04-17 | 2015-08-18 | Domain Surgical, Inc. | Thermal resecting loop |
| US9131977B2 (en) | 2009-04-17 | 2015-09-15 | Domain Surgical, Inc. | Layered ferromagnetic coated conductor thermal surgical tool |
| US9265556B2 (en) | 2009-04-17 | 2016-02-23 | Domain Surgical, Inc. | Thermally adjustable surgical tool, balloon catheters and sculpting of biologic materials |
| US9526558B2 (en) | 2011-09-13 | 2016-12-27 | Domain Surgical, Inc. | Sealing and/or cutting instrument |
| US10357306B2 (en) | 2014-05-14 | 2019-07-23 | Domain Surgical, Inc. | Planar ferromagnetic coated surgical tip and method for making |
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|---|---|---|---|---|
| US842546A (en) * | 1904-12-29 | 1907-01-29 | John Allen Heany | Manufacture of luminant for electric lamps. |
| US2290194A (en) * | 1940-08-13 | 1942-07-21 | Climax Molybdenum Co | Process of producing molybdenum containing alloys |
| US2399747A (en) * | 1943-10-11 | 1946-05-07 | Climax Molybdenum Co | Metallurgy |
| US2566752A (en) * | 1948-10-14 | 1951-09-04 | American Electro Metal Corp | Method of producing a ferrous metal article infiltrated with a cuprous infiltrant |
| US2581252A (en) * | 1947-12-31 | 1952-01-01 | Sintercast Corp America | Powder metallurgy articles |
| US2619406A (en) * | 1949-04-27 | 1952-11-25 | Union Carbide & Carbon Corp | Method for the solid phase production of a disilicide |
| US2665474A (en) * | 1950-03-18 | 1954-01-12 | Fansteel Metallurgical Corp | Highly refractory molybdenum alloys |
-
1953
- 1953-03-25 US US344666A patent/US2831242A/en not_active Expired - Lifetime
Patent Citations (7)
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|---|---|---|---|---|
| US842546A (en) * | 1904-12-29 | 1907-01-29 | John Allen Heany | Manufacture of luminant for electric lamps. |
| US2290194A (en) * | 1940-08-13 | 1942-07-21 | Climax Molybdenum Co | Process of producing molybdenum containing alloys |
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Cited By (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3297487A (en) * | 1964-10-16 | 1967-01-10 | Du Pont | Fuel cell |
| US9320560B2 (en) | 2009-04-17 | 2016-04-26 | Domain Surgical, Inc. | Method for treating tissue with a ferromagnetic thermal surgical tool |
| US8292879B2 (en) | 2009-04-17 | 2012-10-23 | Domain Surgical, Inc. | Method of treatment with adjustable ferromagnetic coated conductor thermal surgical tool |
| US20100268212A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Method for inductively heating a surgical implement |
| US20100268213A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Inductively heated multi-mode surgical tool |
| US20100268209A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Inductively heated snare |
| US20100268208A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Surgical scalpel with inductively heated regions |
| US20100268206A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Method of treatment with multi-mode surgical tool |
| US20100268210A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Inductively heated surgical implement driver |
| US20100268205A1 (en) * | 2009-04-17 | 2010-10-21 | Kim Manwaring | Method of treatment with adjustable ferromagnetic coated conductor thermal surgical tool |
| US11123127B2 (en) | 2009-04-17 | 2021-09-21 | Domain Surgical, Inc. | System and method of controlling power delivery to a surgical instrument |
| US10639089B2 (en) | 2009-04-17 | 2020-05-05 | Domain Surgical, Inc. | Thermal surgical tool |
| US8372066B2 (en) | 2009-04-17 | 2013-02-12 | Domain Surgical, Inc. | Inductively heated multi-mode surgical tool |
| US8377052B2 (en) | 2009-04-17 | 2013-02-19 | Domain Surgical, Inc. | Surgical tool with inductively heated regions |
| US8414569B2 (en) | 2009-04-17 | 2013-04-09 | Domain Surgical, Inc. | Method of treatment with multi-mode surgical tool |
| US8419724B2 (en) | 2009-04-17 | 2013-04-16 | Domain Surgical, Inc. | Adjustable ferromagnetic coated conductor thermal surgical tool |
| US8425503B2 (en) | 2009-04-17 | 2013-04-23 | Domain Surgical, Inc. | Adjustable ferromagnetic coated conductor thermal surgical tool |
| US8430870B2 (en) | 2009-04-17 | 2013-04-30 | Domain Surgical, Inc. | Inductively heated snare |
| US8491578B2 (en) | 2009-04-17 | 2013-07-23 | Domain Surgical, Inc. | Inductively heated multi-mode bipolar surgical tool |
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