US2829427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered refractory material
Assignee: Office National d'Études et de Recherches Aérospatiales
•
Filing: 1953-04-14
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Granted: 1958-04-08
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Expires: 1973-04-14
Abstract
No abstract record available.
Inventors
- 👤 Tacvorian Skon
- 👤 Levecque Marcel
- 👤 Leclerc Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:56
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/12; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026; B; B22; B22F; B22F2999/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
A REFRACTORY MATERIAL CONSISTING ESSENTIALLY OF, IN INTIMATELY BONDED RELATIONSHIP RESULTING FROM SINTERING: ALUMINA IN AN AMOUNT AT LEAST EQUAL TO 20% BY WEIGHT, 2-80% CHROMIUM AND CHROMIUM OXIDE IN AN AMOUNT COMPRISED BETWEEN 0.3% AND 4%.
References Cited (Backward Citations)
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Cited
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US2431660A
Cited
US2554343A
Cited
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Cited
GB676441A
Cited
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Cited
US2672426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |