US2575724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating kovar
Assignee: Westinghouse Electric Corp
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Filing: 1949-03-09
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Granted: 1951-11-20
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Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Ralph O Mcintosh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:28
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; C23C8/16; C23C8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
THE METHOD OF SUBJECTING A KOVAR MEMBER TO SUCCESSIVE TREATMENTS BY HYDROGEN AND OXYGEN AT HIGH TEMPERATURES WHICH COMPRISES HEATING THE KOVAR FROM ROOM TEMPERATURE TO THE DESIRED REACTING TEMPERATURE WHILE SURROUNDED BY AN ATMOSPHERE TO WHICH SAID KOVAR IS CHEMICALLY INERT, THEREUPON DISPLACING THE CHEMICALLY INERT ATMOSPHERE WITH AN ATMOSPHERE WHICH PRODUCES A REDUCING REACTION ON KOVAR AND CONTINUING THE PRESENCE OF THE REDUCING ATMOSPHERE ONLY FOR THE TIME DURING WHICH REACTION IS DESIRED TO TAKE PLACE; THEN DISPLACING THE REDUCING ATMOSPHERE WITH A CHEMICALLY INERT ATMOSPHERE ABOUT THE OBJECT, THEN RAPIDLY DISPLACING THE CHEMICALLY INERT ATMOSPHERE ABOUT THE OBJECT BY AN ATMOSPHERE WHICH HAS AN OXIDIZING EFFECT ON KOVAR AND CONTINUING THE PRESENCE OF THE OXIDIZING ATMOSPHERE FOR THE PERIOD DURING WHICH IT IS DESIRED TO CONTINUE OXIDATION; THEN RAPIDLY DISPLACING THE OXIDIZING ATMOSPHERE WITH AN ATMOSPHERE WHICH IS CHEMICALLY INERT TO KOVAR AND THEREAFTER COOLING THE KOVAR WHILE SURROUNDED BY SAID INERT ATMOSPHERE TO A TEMPERATURE AT WHICH IT WILL NOT OXIDIZE IN AIR BEFORE REMOVING IT FROM THE FURNACE.
Claim 2
Independent Claim
173 words
THE METHOD OF SUBJECTING A KOVAR MEMBER TO SUCCESSIVE TREATMENTS BY HYDROGEN AND OXYGEN AT HIGH TEMPERATURES WHICH COMPRISES HEATING THE KOVAR FROM ROOM TEMPERATURE TO THE DESIRED REACTING TEMPERATURE WHILE SURROUNDED BY AN ATMOSPHERE TO WHICH SAID KOVAR IS CHEMICALLY INERT, THEREUPON DISPLACING THE CHEMICALLY INERT ATMOSPHERE WITH AN ATMOSPHERE WHICH PRODUCES A REDUCING REACTION ON KOVAR AND CONTINUING THE PRESENCE OF THE REDUCING ATMOSPHERE ONLY FOR THE TIME DURING WHICH REACTION IS DESIRED TO TAKE PLACE; THEN DISPLACING THE REDUCING ATMOSPHERE WITH A CHEMICALLY INERT ATMOSPHERE ABOUT THE OBJECT, THEN RAPIDLY DISPLACING THE CHEMICALLY INERT ATMOSPHERE ABOUT THE OBJECT BY AN ATMOSPHERE WHICH HAS AN OXIDIZING EFFECT ON KOVAR AND CONTINUING THE PRESENCE OF THE OXIDIZING ATMOSPHERE FOR THE PERIOD DURING WHICH IT IS DESIRED TO CONTINUE OXIDATION; THEN RAPIDLY DISPLACING THE OXIDIZING ATMOSPHERE WITH AN ATMOSPHERE WHICH IS CHEMICALLY INERT TO KOVAR AND THEREAFTER COOLING THE KOVAR WHILE SURROUNDED BY SAID INERT ATMOSPHERE TO A TEMPERATURE AT WHICH IT WILL NOT OXIDIZE IN AIR BEFORE REMOVING IT FROM THE FURNACE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |