Patent US2431327A successfully refreshed from Google Patents.
US2431327A
Expired / Lapsed
US
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Refractory and method of making same
Assignee: Unifrax I LLC
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Filing: 1943-08-03
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Granted: 1947-11-25
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Expires: 1963-08-03
Abstract
No abstract record available.
Inventors
- 👤 Charles F Geiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/984
Claims Analysis
Total Claims: 0
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Cited
US1331435A
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US1483507A
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US1868631A
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Cited
US2005956A
Cited
US2004594A
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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) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |