US2907972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing silicon carbide bodies
Assignee: Unifrax I LLC
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Filing: 1957-08-12
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Granted: 1959-10-06
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Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Walter E Schildhauer
- 👤 Skuza Matthew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN A COLD END HEATING ROD HAVING A SILICON CARBIDE HEATING SECTION AND A COLD END OF SILICONIZED SILICON CARBIDE, A JOINT UNITING THE HEATING SECTION TO THE END AND HAVING A THICKNESS UP TO ABOUT 1/32'''', SAID JOINT CONSISTING ESSENTIALLY OF CRYSTALLINE SILICON CARBIDE, NOT MORE THAN ABOUT 8% BY WEIGHT OF THE JOINT OF ELEMENTAL SILICON,
Claim 2
Dependent Claim
58 words
IN A COLD END HEATING ROD HAVING A SILICON CARBIDE HEATING SECTION AND A COLD END OF SILICONIZED SILICON CARBIDE, A JOINT UNITING THE HEATING SECTION TO THE END AND HAVING A THICKNESS UP TO ABOUT 1/32'''', SAID JOINT CONSISTING ESSENTIALLY OF CRYSTALLINE SILICON CARBIDE, NOT MORE THAN ABOUT 8% BY WEIGHT OF THE JOINT OF ELEMENTAL SILICON,
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) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |