Patent US3836673A successfully refreshed from Google Patents.
US3836673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered silicon carbide
Assignee: Saint Gobain Abrasives Inc
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Filing: 1972-03-23
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Granted: 1974-09-17
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Expires: 1992-03-23
Abstract
Abstract A DENSE SILICON CARBIDE PRODUCT IS DESCRIBED. THE PRODUCT HAS A FLEXURAL STRENGTH ABOVE 100,000 P.S.I. AT ROOM TEMPERATURE, ABOVE 80,000 P.S.I. AT 1200*C., ABOVE 60,000 P.S.I. AT 1375*C. AND ABOVE 45,000 P.S.I AT 1500*C. THE PRODUCT HAS A GRAIN SIZE OF LESS THAN 5 MICRONS AND ESENTIALLY ALL OF THE SILICON CARBIDE IS IN THE ALPHA FORM. THE PRODUCT HAS A DENSITY IN EXCESS OF 99% OF THEORETICAL DENSITY AND CONTAINS ABOUT .5% TO 5% ALUMINUM. A PREFERRED PROCESS FOR PREPARING THE PRODUCT IS ALSO DESCRIBED.
Inventors
- 👤 G Weaver
- 👤 B Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/575; Y; Y10; Y10S; Y10S75/00; Y10S75/95
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |