US3473938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making high strength refractory structures
Assignee: EIDP Inc
•
Filing: 1968-04-05
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Granted: 1969-10-21
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Expires: 1988-04-05
Abstract
No abstract record available.
Inventors
- 👤 Robert E Oberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5076; C04B28/00; C04B28/24; C04B28/26; C04B35/00; C04B35/622; C04B35/64; C04B35/65; C04B38/00; C04B38/0006; C04B41/009; C04B41/80; C04B41/81; C04B41/85
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2631353A
Cited
US3255027A
Cited
US3244539A
Cited
US3248241A
Cited
US3296002A
Cited
US3285761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |