Patent US2991824A successfully refreshed from Google Patents.
US2991824A
Expired / Lapsed
US
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Recessed end gypsum board and process of manufacture
Assignee: Celotex Corp
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Filing: 1957-08-29
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Granted: 1961-07-11
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Expires: 1977-08-29
Abstract
No abstract record available.
Inventors
- 👤 Clarence J Loechl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:51
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; B; B28; B28B; B28B19/00; B28B19/0092; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2006528A
Cited
US2044234A
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US2090084A
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US2168803A
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US2238017A
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US2246987A
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US2537509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |