US3058809A
Expired / Lapsed
US
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Methods for making boron nitride materials
Assignee: Unifrax I LLC
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Filing: 1957-12-05
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Granted: 1962-10-16
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Expires: 1977-12-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:24
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C01B21/0648; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD OF PREPARING A STABILIZED AND HOT PRESSABLE BORON NITRIDE WHICH COMPRISES SELECTING A GRANULAR UNSTABILIZED BORON NITRIDE MATERIAL MADE BY DIRECTLY NITRIDING A MIXTURE OF AN OXIDIC COMPOUND OF BORON AND A DILUENT AND WHICH UPON ANALYSIS AFTER HEATING UNDER PRESSURE IN AN INSERT ATMOSPHERE TO A TEMPERATURE OF FROM 1500* C. TO 1800* C. FOR ONE HOUR CONTAINS MORE THAN ABOUT 7% AND UP TO ABOUT 20% FREE B203, HEATING SAID UNSTABILIZED BORON NITRIDE MATERIAL IN AN ATMOSPHERE OF AMMONIA AT A TEMPERATURE OF 1200* C. TO 1700* C. FOR A PERIOD OF TIME SUFFICIENT TO NITRIDE PART OF THE UNNITRIDED BORON COMPOUNDS PRESENT IN THE UNSTABILIZED BORON NITRIDE MATERIAL, AND DISCONTINUING SAID HEAT TREATMENT WHILE THE MATERIAL HAS A STABILIZATION PERCENTAGE OF ABOUT 2% TO 7% AND IS STILL CAPABLE OF BEING HOT PRESSED, THEREBY FORMING STABILIZED HOT PRESSABLE BORON NITRIDE.
Claim 2
Independent Claim
145 words
A METHOD OF PREPARING A STABILIZED AND HOT PRESSABLE BORON NITRIDE WHICH COMPRISES SELECTING A GRANULAR UNSTABILIZED BORON NITRIDE MATERIAL MADE BY DIRECTLY NITRIDING A MIXTURE OF AN OXIDIC COMPOUND OF BORON AND A DILUENT AND WHICH UPON ANALYSIS AFTER HEATING UNDER PRESSURE IN AN INSERT ATMOSPHERE TO A TEMPERATURE OF FROM 1500* C. TO 1800* C. FOR ONE HOUR CONTAINS MORE THAN ABOUT 7% AND UP TO ABOUT 20% FREE B203, HEATING SAID UNSTABILIZED BORON NITRIDE MATERIAL IN AN ATMOSPHERE OF AMMONIA AT A TEMPERATURE OF 1200* C. TO 1700* C. FOR A PERIOD OF TIME SUFFICIENT TO NITRIDE PART OF THE UNNITRIDED BORON COMPOUNDS PRESENT IN THE UNSTABILIZED BORON NITRIDE MATERIAL, AND DISCONTINUING SAID HEAT TREATMENT WHILE THE MATERIAL HAS A STABILIZATION PERCENTAGE OF ABOUT 2% TO 7% AND IS STILL CAPABLE OF BEING HOT PRESSED, THEREBY FORMING STABILIZED HOT PRESSABLE BORON NITRIDE.
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |