US3573092A
Expired / Lapsed
US
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Method for introducing carbon into chemical vapor deposited refractory metal,and resulting product
Assignee: Air Products and Chemicals Inc
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Filing: 1968-04-01
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Granted: 1971-03-30
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Expires: 1988-04-01
Abstract
Abstract CONVENTIONAL CHEMICAL VAPOR DEPOSITION TECHNIQUE IS EMPLOYED TO INTRODUCE A TRACE AMOUNT OF CARBON INTO A REFRACTORY METAL, SUCH AS TUNGSTEN, FOLLOWED BY HEAT TREATMENT OF THE METAL, TO STABILIZE THE GRAIN STRUCTURE, STRENGTHEN THE METAL, AND PREVENT GROWTH OF THE GRAINS WHEN THE METAL IS SUBJECTED TO A HIGH TEMPERATURE ENVIRONMENT.
Inventors
- 👤 Robert A Holzl
- 👤 Richard D Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:53
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/56; C23C16/06; C23C16/08; C23C16/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |