Patent US2824787A successfully refreshed from Google Patents.
US2824787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of boron nitride
Assignee: American Potash and Chemical Corp
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Filing: 1955-06-22
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Granted: 1958-02-25
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Expires: 1975-06-22
Abstract
No abstract record available.
Inventors
- 👤 Frank H May
- 👤 Vladimir V Levasheff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:28
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN A PROCESS FOR PRODUCING BORON NITRIDE THE STEPS OF PRODUCING A BORON COMPLEX COMPRISING REACTING AMMONIA AND METHYL BORATE AT A TEMPERATURE ABOVE ABOUT 850*C., THE AMMONIA BEING PRESENT IN AT LEAST A SLIGHT EXCESS OVER A MOLE TO MOLE RATIO WIGH METHYL BORATE, AND RECOVERING THE PRODUCT OF REACTION.
Claim 2
Dependent Claim
51 words
IN A PROCESS FOR PRODUCING BORON NITRIDE THE STEPS OF PRODUCING A BORON COMPLEX COMPRISING REACTING AMMONIA AND METHYL BORATE AT A TEMPERATURE ABOVE ABOUT 850*C., THE AMMONIA BEING PRESENT IN AT LEAST A SLIGHT EXCESS OVER A MOLE TO MOLE RATIO WIGH METHYL BORATE, AND RECOVERING THE PRODUCT OF REACTION.
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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |