US3212852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for converting hexagonal boron nitride to a new structure
Assignee: General Electric Co
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Filing: 1962-07-30
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Granted: 1965-10-19
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Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 Francis P Bundy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831; B; B82; B82Y; B82Y30/00; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C01P; C01P2006/00; C01P2006/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A METHOD FOR CONVERTING HEXAGONAL BORON NITIRDE IN THE ABSENCE OF A CATALYST TO A CRYSTALLINE SUBSTANCE SUBSTANTIALLY EQUAL IN HARDNESS TO THE HARDNESS OF DIAMOND WHICH COMPRISES OF STEPS OF: (A) PREPARING A SPECIMEN CONSISTING ESSENTIALLY OF HEXAGONAL BORON NITRIDE, (B) SUBJECTING SAID SPECIMEN TO SIMULTANEOUS PRESSURE AND TEMPERATURE CONDITIONS IN THE REGION ABOVE THE LOWER LIMITS OF THE CURVE TH OF THE GRAPH OF FIG. 6 FOR A PERIOD OF AT LEAST ABOUT 1 MINUTE, (1) SAID PRESSURE BEING STATICALLY APPLIED AND HAVING A VALUE OF AT LEAST ABOUT 100 KILOBARS, (2) SAID TEMPERATURE HAVING A MAXIMUM VALUE OF ABOUT 3600*K., (C) PERMITTING SAID SPECIMEN TO RETURN TO AMBIENT ATMOSPHERIC CONDITIONS, AND (D) SEPARATING THE BORON NITRIDE CRYSTALS OF INCREASED HARDNESS FROM ANY UNCOVERTED HEXAGONAL BORON NITRIDE.
Claim 2
Independent Claim
129 words
A METHOD FOR CONVERTING HEXAGONAL BORON NITIRDE IN THE ABSENCE OF A CATALYST TO A CRYSTALLINE SUBSTANCE SUBSTANTIALLY EQUAL IN HARDNESS TO THE HARDNESS OF DIAMOND WHICH COMPRISES OF STEPS OF: (A) PREPARING A SPECIMEN CONSISTING ESSENTIALLY OF HEXAGONAL BORON NITRIDE, (B) SUBJECTING SAID SPECIMEN TO SIMULTANEOUS PRESSURE AND TEMPERATURE CONDITIONS IN THE REGION ABOVE THE LOWER LIMITS OF THE CURVE TH OF THE GRAPH OF FIG. 6 FOR A PERIOD OF AT LEAST ABOUT 1 MINUTE, (1) SAID PRESSURE BEING STATICALLY APPLIED AND HAVING A VALUE OF AT LEAST ABOUT 100 KILOBARS, (2) SAID TEMPERATURE HAVING A MAXIMUM VALUE OF ABOUT 3600*K., (C) PERMITTING SAID SPECIMEN TO RETURN TO AMBIENT ATMOSPHERIC CONDITIONS, AND (D) SEPARATING THE BORON NITRIDE CRYSTALS OF INCREASED HARDNESS FROM ANY UNCOVERTED HEXAGONAL 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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |