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US3607060A
Expired / Lapsed
US
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Method of manufacturing diamond crystals
Assignee: Individual
•
Filing: 1969-03-04
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Granted: 1971-09-21
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Expires: 1989-03-04
Abstract
Abstract Diamond crystals are produced by subjecting to elevated temperatures and pressures a mixture of a nondiamond form of carbon together with a mixture or alloy of cobalt and phosphorus, which serves as the solvent and catalyst for the conversion to diamond form. Use of cobalt and phosphorus for solvent and catalyst allows conversion of nondiamond carbon to diamond at lower pressures than previously utilized, i.e., from about 42,200 to about 49,000 atmospheres.
Inventors
- 👤 Tatsuo Kuratomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:54
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/0625; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/068
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
5 words
cooling the resultant product, and
Claim 2
Dependent Claim
14 words
The process of claim 1 in which the pressure employed is about 45,620 atmospheres.
Claim 3
Dependent Claim
14 words
The process of claim 2 in which the temperature employed is about 1,150* C.
Claim 4
Dependent Claim
5 words
separating the diamond crystals therefrom.
Claim 5
Dependent Claim
16 words
The process of claim 3 in which the ratio of cobalt to phosphorus is about 16:1.
Claim 6
Dependent Claim
20 words
The process of claim 4 in which the ratio of carbon to cobalt ranges from about 1.25:1 to about 1:1.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |