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Patent US3203814A successfully refreshed from Google Patents.
US3203814A
Expired / Lapsed
US
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Method for increasing the thermal endurance of silicon carbide
Assignee: Hitachi Ltd
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Filing: 1965-02-09
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Granted: 1965-08-31
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Expires: 1985-02-09
Abstract
No abstract record available.
Inventors
- 👤 Muta Akinori
- 👤 Gejo Tetuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:39
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C04B41/45; C04B41/50; C04B41/5076; C04B41/5092; C04B41/80; C04B41/81; C04B41/85
Claims Analysis
Total Claims: 0
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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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |