Patent US2412086A successfully refreshed from Google Patents.
US3949062A
Expired / Lapsed
US
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Method for producing polycrystalline diamond aggregates of predetermined shape
Assignee: Individual
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Filing: 1972-12-27
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Granted: 1976-04-06
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Expires: 1992-12-27
Abstract
Abstract A workpiece made of a non-diamond carbonaceous material and having dimensions exceeding those of a polycrystalline diamond aggregate by a contraction coefficient value of the non-diamond material during its transformation into a polycrystalline diamond material, is enclosed with a powder-like catalyst having particle dimensions less than the minimum dimensions of the workpiece, subjected to a pressure of at least 80 kb, and heated by a pulse of electric current for a period of 0.1 to 10 seconds sufficient for the formation of said polycrystalline aggregate.
Inventors
- 👤 Leonid Fedorovich Vereschagin
- 👤 Alexandr Yakovlevich Preobrazhensky
- 👤 Vasily Alexandrovich Stepanov
- 👤 Valentin Semenovich Voblikov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:30
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/061; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
A method for producing polycrystalline diamond aggregates of a predetermined shape which comprises surrounding and enclosing a monolithic workpiece made of graphite having a grain size of from 300 to 1000 A and having said predetermined shape and dimensions exceeding those of the polycrystalline diamond aggregate of a predetermined shape by a contraction coefficient value of the graphite during its transformation into a polycrystalline diamond material, in a catalyst in powder form having a particle size of from 1 to 5 μ, subjecting said workpiece to a pressure of at least 80 kb, and heating it to a temperature of at least 1,500°C for a period of 0.1 to 10 seconds sufficient for the formation of said polycrystalline aggregate.
Claim 2
Independent Claim
119 words
A method for producing polycrystalline diamond aggregates of a predetermined shape which comprises surrounding and enclosing a monolithic workpiece made of graphite having a grain size of from 300 to 1000 A and having said predetermined shape and dimensions exceeding those of the polycrystalline diamond aggregate of a predetermined shape by a contraction coefficient value of the graphite during its transformation into a polycrystalline diamond material, in a catalyst in powder form having a particle size of from 1 to 5 μ, subjecting said workpiece to a pressure of at least 80 kb, and heating it to a temperature of at least 1,500°C for a period of 0.1 to 10 seconds sufficient for the formation of said polycrystalline aggregate.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, wherein the said workpiece has dimensions exceeding by 20 to 30% those of the polycrystalline aggregate of a predetermined shape.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1, wherein said graphite has a density of at least 2.00 g/cm 3 .
Claim 5
Dependent Claim
15 words
A method as claimed in claim 1, wherein said graphite is spectral purity grade graphite.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |