US3630677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of synthetic diamonds
Assignee: Case Western Reserve University
•
Filing: 1968-06-26
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Granted: 1971-12-28
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Expires: 1988-06-26
Abstract
Abstract There is provided an improvement on a low-pressure process for the growth of synthetic diamonds from diamond seed crystals by contacting them with a monocarbon atom gas which also contains a ''''doping agent'''' such as a compound of boron or aluminum or lithium vapor in the gas phase at a pressure of from 760 (Torr.) to 1 X 10 1 (Torr.) and at a temperature in the range of from 900* C. to 1450* C. and for deposition-cleaning cycle periods in the range of from 4 to 28 hours.
Inventors
- 👤 John C Angus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:16
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/25; C01B32/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
A process in accordance with claim 1 in which the gaseous doping is a borane.
Claim 2
Dependent Claim
15 words
A process in accordance with claim 2 in which the borane is a halogenated borane.
Claim 3
Dependent Claim
13 words
A process in accordance with claim 2 in which the borane is diborane.
Claim 4
Dependent Claim
17 words
A process in accordance with claim 1 in which the gaseous doping agent is an aluminum halide.
Claim 5
Dependent Claim
15 words
A process in accordance with claim 5 in which the aluminum halide is aluminum chloride.
Claim 6
Dependent Claim
17 words
A process in accordance with claim 1 in which the gaseous doping agent is an aluminum alkyl.
Claim 7
Dependent Claim
15 words
A process in accordance with claim 7 in which the aluminum alkyl is aluminum triethyl.
Claim 8
Dependent Claim
14 words
A process in accordance with claim 1 in which the doping agent is lithium.
References Cited (Backward Citations)
US3030188A
Cited
US3148161A
Cited
US3134739A
Cited
US3142595A
Cited
US3268457A
Cited
US3348984A
Cited
US3473974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |