Patent US2834650A successfully refreshed from Google Patents.
US2834650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of boron nitride
Assignee: Union Carbide Corp
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Filing: 1955-10-04
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Granted: 1958-05-13
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Expires: 1975-10-04
Abstract
No abstract record available.
Inventors
- 👤 Louis A Conant
- 👤 Evart F Hittle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:57
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C01B21/0645
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A PROCESS FOR PRODUCING BORON NITRIDE WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF METABORIC ACID AND BORIC OXIDE WITH CALCIUM CYANAMIDE AT A TEMPERATURE IN THE RANGE 1200*C. TO 2000*C. IN A NON-OXIDIZING, NITROGENOUS ATMOSPHERE.
Claim 2
Dependent Claim
39 words
A PROCESS FOR PRODUCING BORON NITRIDE WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF METABORIC ACID AND BORIC OXIDE WITH CALCIUM CYANAMIDE AT A TEMPERATURE IN THE RANGE 1200*C. TO 2000*C. IN A NON-OXIDIZING, NITROGENOUS ATMOSPHERE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |