Patent US3825440A successfully refreshed from Google Patents.
US3825440A
Expired / Lapsed
US
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Vapor deposition method
Assignee: United States Department of the Army
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Filing: 1973-04-03
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Granted: 1974-07-23
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Expires: 1993-04-03
Abstract
Abstract ISOTROPIC BORON NITRIDE IS VAPOR DEPOSITED ONTO A SUBSTRATE BY SUSPENDING THE SUBSTRATE IN A HOT REACTION CHAMBER THE INNER WALLS OF WHICH BEAR A DEPOSIT OF ANISOTROPIC BORON NITRIDE, AND ADDING EITHER WATER OR AMMONIUM HYDROXIDE TO THE REACTION CHAMBER WHILE THE TEMPERATURE OF OF THE REACTION CHAMBER IS MAINTAINED AT ABOUT 850 DEGREES C. TO ABOUT 1600 DEGREES C.
Inventors
- 👤 M Long
- 👤 L Branovich
- 👤 W Fitzpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:47
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/34; C23C16/342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |