Patent US2430896A successfully refreshed from Google Patents.
Patent US2492790A successfully refreshed from Google Patents.
US2492790A
Expired / Lapsed
US
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Acid resisting cement and method of making
Assignee: Ellis Foster Co
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Filing: 1947-04-30
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Granted: 1949-12-27
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Expires: 1967-04-30
Abstract
No abstract record available.
Inventors
- 👤 Farkas Ladislaw Vilmos
- 👤 Szwarc Michael Mojzesz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:55
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C04B24/00; C04B24/04; C04B24/045; C04B24/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |