US4201757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large boron nitride abrasive particles
Assignee: General Electric Co
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Filing: 1978-09-15
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Granted: 1980-05-06
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Expires: 1998-09-15
Abstract
Abstract Hard boron nitride particles of wurtzite and zincblende crystal structure of larger than 50 microns particle size are formed by subjecting recrystallized pyrolytic boron nitride to dynamic shock treatment to create pressures and temperatures in which the stable form of boron nitride has a wurtzite or zincblende crystal structure.
Inventors
- 👤 Francis R. Corrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:02
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/064; B; B01; B01J; B01J3/00; B01J3/06; B01J3/08; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; B01J2203/00; B01J2203/06; B01J2203/065; B01J2203/066; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/10; C01P2006/21
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
27 words
Wurtzite boron nitride particles having a particle size of at least 50 microns, said particles being obtained by compression of recrystallized pyrolytic boron nitride along the C-axis.
Claim 2
Dependent Claim
27 words
Wurtzite boron nitride particles having a particle size of at least 50 microns, said particles being obtained by compression of recrystallized pyrolytic boron nitride along the C-axis.
Claim 3
Dependent Claim
19 words
Wurtzite boron nitride particles as claimed in claim 1 in which the average particle size is about 100 microns.
Claim 4
Dependent Claim
39 words
Wurtizite nitride particles larger than 50 microns in diameter produced by subjecting recrystallized pyrolytic boron nitride to dynamic shock treatment at pressure and temperature in the stable region of the boron nitride phrase diagram for high density boron nitride.
Claim 5
Dependent Claim
39 words
Wurtizite nitride particles larger than 50 microns in diameter produced by subjecting recrystallized pyrolytic boron nitride to dynamic shock treatment at pressure and temperature in the stable region of the boron nitride phrase diagram for high density boron nitride.
Claim 6
Dependent Claim
13 words
The abrasive particles of claim 3 which are several hundred microns in diameter.
Claim 7
Dependent Claim
16 words
The abrasive particles of claim 3 in which the average particle size is about 100 microns.
Claim 8
Dependent Claim
13 words
Wurtzite boron nitride particles having a particle size of at least 50 microns.
Claim 9
Dependent Claim
13 words
Wurtzite boron nitride particles having a particle size of at least 50 microns.
Claim 10
Dependent Claim
16 words
The particles of claim 6, in which the particle size is several hundred microns in diameter.
Claim 11
Dependent Claim
15 words
The particles of claim 6, in which the average particle size is about 100 microns.
References Cited (Backward Citations)
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FR2083234A5
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |