Patent US4381955A successfully refreshed from Google Patents.
US4381955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gold based electrical contact materials, and method therefor
Assignee: United States Department of the Navy
•
Filing: 1981-04-17
•
Granted: 1983-05-03
•
Expires: 2001-04-17
Abstract
Abstract There is presented gold based contact materials fabricated by internal carburization and method therefor. Carburizable refractory elements are carburized by internal carburization by exposing a gold based solid solution containing the refractory element to an atmosphere of a gaseous oxide of carbon at an elevated temperature. The elevated temperature is chosen to be below the melting point of the solid solution and high enough to cause gaseous decomposition of a carbon material packed with the solid solution within an enclosing container. The carburizable refractory element with the solid solution is preferentially carburized by the gaseous oxide of carbon to form hard, refractory second phase carbide particles within the gold matrix.
Inventors
- 👤 Jaydev D. Desai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:34
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
A method of carburizing by internal carburization a carburizable refractory element in a solid solution with gold comprising the steps of: enclosing the solid solution and a temperature decomposable carbon material, and subjecting the solid solution and the carbon bearing material to a predetermined temperature below the melting temperature of the solid solution and higher than the decomposition temperature of the carbon material for a predetermined period of time.
Claim 2
Independent Claim
69 words
A method of carburizing by internal carburization a carburizable refractory element in a solid solution with gold comprising the steps of: enclosing the solid solution and a temperature decomposable carbon material, and subjecting the solid solution and the carbon bearing material to a predetermined temperature below the melting temperature of the solid solution and higher than the decomposition temperature of the carbon material for a predetermined period of time.
Claim 3
Independent Claim
108 words
A method of carburizing a carburizable refractory element in a solid solution with gold comprising the steps of: enclosing the solid solution and a temperature decomposable carbon material, and subjecting the solid solution and the carbon material to a predetermined temperature below the melting temperature of the solid solution and higher than the decomposition temperature of the carbon material for a predetermined period of time, the carbon material being chosen to generate a gaseous oxide of carbon at the predetermined temperature, the gaseous oxide of carbon preferentially carburizing the carburizable refractory element by internal carburization to form carbide particles of the carburizable refractory element within the solid solution.
Claim 4
Independent Claim
108 words
A method of carburizing a carburizable refractory element in a solid solution with gold comprising the steps of: enclosing the solid solution and a temperature decomposable carbon material, and subjecting the solid solution and the carbon material to a predetermined temperature below the melting temperature of the solid solution and higher than the decomposition temperature of the carbon material for a predetermined period of time, the carbon material being chosen to generate a gaseous oxide of carbon at the predetermined temperature, the gaseous oxide of carbon preferentially carburizing the carburizable refractory element by internal carburization to form carbide particles of the carburizable refractory element within the solid solution.
Claim 5
Independent Claim
113 words
A method of carburizing by internal carburization a carburizable refractory element in a solid solution with gold comprising the steps of: providing a carbon material in a close proximity to the solid solution, elevating the temperature of the solid solution and the carbon bearing material, the carbon material having been chosen for generating a gaseous oxide of carbon at a predetermined temperature below the melting temperature of the solid solution, and subjecting the solid solution to the gaseous oxide of carbon for a predetermined period of time sufficient for at least a portion of the refractory element to carburize, by internal carburization, forming carbide particles of the refractory element within the solid solution.
Claim 6
Independent Claim
113 words
A method of carburizing by internal carburization a carburizable refractory element in a solid solution with gold comprising the steps of: providing a carbon material in a close proximity to the solid solution, elevating the temperature of the solid solution and the carbon bearing material, the carbon material having been chosen for generating a gaseous oxide of carbon at a predetermined temperature below the melting temperature of the solid solution, and subjecting the solid solution to the gaseous oxide of carbon for a predetermined period of time sufficient for at least a portion of the refractory element to carburize, by internal carburization, forming carbide particles of the refractory element within the solid solution.
Claim 7
Independent Claim
90 words
A method for forming by internal carburization a carbide dispersion of a carburizable refractory element in a solid solution with gold comprising the steps of: enclosing the solid solution and a temperature decomposable carbon bearing material, and subjecting the solid solution and the carbon bearing material to a temperature below the melting temperature of the solid solution and higher than the decomposition temperature of the carbon bearing material for a predetermined period of time for forming by internal carburization carbide particles of the carburizable refractory element within the solid solution.
Claim 8
Independent Claim
90 words
A method for forming by internal carburization a carbide dispersion of a carburizable refractory element in a solid solution with gold comprising the steps of: enclosing the solid solution and a temperature decomposable carbon bearing material, and subjecting the solid solution and the carbon bearing material to a temperature below the melting temperature of the solid solution and higher than the decomposition temperature of the carbon bearing material for a predetermined period of time for forming by internal carburization carbide particles of the carburizable refractory element within the solid solution.
Claim 9
Independent Claim
29 words
The method of claims 1, 2 or 4 wherein the carburizable refractory element is selected from a group consisting of Ti, Ta, Hf, V, Nb, Zr, Cr and W.
Claim 10
Dependent Claim
26 words
The method of claim 3, wherein the carburizable refractory element is selected from a group consisting of Ti, Ta, Hf, V, Nb, Zr, Cr and W.
References Cited (Backward Citations)
US2032694A
Cited
US2148040A
Cited
US2413928A
Cited
US3197346A
Cited
US3099589A
Cited
US3153163A
Cited
US3650850A
Cited
US3830670A
Cited
US3992199A
Cited
US4268323A
Cited
US4253885A
Cited
US4306918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |