Patent US2200155A successfully refreshed from Google Patents.
US2200155A
Expired / Lapsed
US
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Manufacture of wallboard having a cementitious core
Assignee: United States Gypsum Co
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Filing: 1936-11-21
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Granted: 1940-05-07
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Expires: 1956-11-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas P Camp
- 👤 Ellyn Glen
- 👤 Page John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:20
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0092; B28B1/00; B28B1/50; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-05-07 | 1943-11-06 | 1944-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-07 | 1947-11-06 | 1948-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-07 | 1951-11-06 | 1952-05-07 | $7700.00 | Window Closed / Lapsed |