US3768972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing cubic boron nitride with aluminum containing catalyst
Assignee: Westinghouse Electric Corp
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Filing: 1971-05-10
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Granted: 1973-10-30
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Expires: 1991-05-10
Abstract
Abstract An improved method for converting boron nitride from the hexagonal to the cubic form in which powdered hexagonal boron nitride is mixed with at least one catalyst selected from the group consisting of elemental aluminum, and Beta -phase alloys of nickel and aluminum, and particularly NiAl, CoAl, FeNiAl, CoNiAl, CoCuAl, CuNiAl, FeNiCoAl, CuCoNiAl, and FeCoCuAl, and the mixture compressed at a pressure of from about 60 kilobars to about 85 kilobars and higher while heating to a temperature of from about 800* C to about 1600* C.
Inventors
- 👤 A Taylor
- 👤 N Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
20 words
The method of claim 1 in which the amount of boron nitride in the mixture is about 99.5 wt. percent.
Claim 2
Dependent Claim
15 words
The method of claim 2 in which the catalyst is 0.5 wt. percent elemental aluminum.
Claim 3
Dependent Claim
16 words
The method of claim 3 wherein the mixture is heated to a temperature of about 1,000*C.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein the mixture is compressed to a pressure of about 78 kilobars.
Claim 5
Dependent Claim
21 words
Method of claim 1 in which the particle size of the powders is within the range between 0.05 and 1.0 micron.
References Cited (Backward Citations)
DE1131645B
Cited
US2947617A
Cited
US3261667A
Cited
US3141802A
Cited
US3150929A
Cited
US3240563A
Cited
US3411882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |