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US2979414A
Expired / Lapsed
US
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Ceramic tool material
Assignee: United States Ceramic Tile Co
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Filing: 1957-11-15
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Granted: 1961-04-11
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Expires: 1977-11-15
Abstract
No abstract record available.
Inventors
- 👤 Eugene I Ryshkewitch
- 👤 Taylor Hiram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/575; Y; Y10; Y10T; Y10T137/00; Y10T137/9464; Y10T407/00; Y10T407/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A WEAR-RESISTANT, DENSE, NON-POROUS MATERIAL CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF FINE-GRAINED SILICON CARBIDE PARTICLES AND FINE ALUMINA PARTICLES, THE SILICON CARBIDE PARTICLES CONSTITUTING FROM ABOUT 8 TO ABOUT 50% BY VOLUME OF THE MIXTURE, WHEREIN THE PARTICLES ARE IN INTIMATE CONTACT WITHOUT GAPS THEREBETWEEN.
Claim 2
Dependent Claim
46 words
A WEAR-RESISTANT, DENSE, NON-POROUS MATERIAL CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF FINE-GRAINED SILICON CARBIDE PARTICLES AND FINE ALUMINA PARTICLES, THE SILICON CARBIDE PARTICLES CONSTITUTING FROM ABOUT 8 TO ABOUT 50% BY VOLUME OF THE MIXTURE, WHEREIN THE PARTICLES ARE IN INTIMATE CONTACT WITHOUT GAPS THEREBETWEEN.
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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |