Patent US2691292A successfully refreshed from Google Patents.
US2691292A
Expired / Lapsed
US
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Prefabricated panel
Assignee: Celanese Corp
•
Filing: 1949-07-07
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Granted: 1954-10-12
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Expires: 1969-07-07
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:02
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/044; E04C2002/045; E04C2002/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1280530A
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US1469955A
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US1661044A
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US1867329A
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US1951421A
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US2063309A
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US2131462A
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US2263016A
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US2460309A
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US2518640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |