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US4089933A
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Method of producing polycrystalline diamond aggregates
Assignee: Institut Fiziki Vysokikh Daleny Akademi Nauk
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Filing: 1976-09-27
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Granted: 1978-05-16
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Expires: 1996-09-27
Abstract
Abstract A method of producing polycrystalline diamond aggregates, wherein a carbon-containing material is given a required shape, after which, in the presence of a catalyst taken in the form of a powder whose envelope surrounds the carbon-containing material, said material is subjected to the action of pressure and simultaneous heating by an electric current pulse with a duration of 0.1 to 10.0 sec.
Inventors
- 👤 Leonid Fedorovich Vereschagin
- 👤 Evgeny Nikolaevich Yakovlev
- 👤 Tatyana Dmitrievna Varfolomeeva
- 👤 Alexandr Yakovlevich Preobrazhensky
- 👤 Vladislav Nikolaevich Slesarev
- 👤 Vasily Alexandrovich Stepanov
- 👤 Ljudmila Efimovna Shterenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:20
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: 2
Claim 1
Independent Claim
122 words
In a method of producing polycrystalline diamond aggregates, wherein a carbon-containing material is given a required shape and in the presence of a catalyst subjected to a pressure of at least about 80 kbar and heated simultaneously to a temperature of at least about 1,500° C for a period of time sufficient for the formation of diamond aggregates, the improvement which comprises imparting to said carbon-containing material the shape of the required polycrystalline aggregate and providing said catalyst as an envelope in the form of powder surrounding said carbon-containing material, said catalyst transmitting pressure uniformly to said carbon-containing material in the course of compression, and said heating being effected by an electric pulse having a duration of from 0.1 to 10 seconds.
Claim 2
Dependent Claim
122 words
In a method of producing polycrystalline diamond aggregates, wherein a carbon-containing material is given a required shape and in the presence of a catalyst subjected to a pressure of at least about 80 kbar and heated simultaneously to a temperature of at least about 1,500° C for a period of time sufficient for the formation of diamond aggregates, the improvement which comprises imparting to said carbon-containing material the shape of the required polycrystalline aggregate and providing said catalyst as an envelope in the form of powder surrounding said carbon-containing material, said catalyst transmitting pressure uniformly to said carbon-containing material in the course of compression, and said heating being effected by an electric pulse having a duration of from 0.1 to 10 seconds.
References Cited (Backward Citations)
US2947608A
Cited
US2947610A
Cited
US2947609A
Cited
US3334968A
Cited
US3310501A
Cited
US3399254A
Cited
US3574580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |