Patent US1932956A successfully refreshed from Google Patents.
US1932956A
Expired / Lapsed
US
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Method of making wall board
Assignee: National Gypsum Co
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Filing: 1933-02-23
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Granted: 1933-10-31
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Expires: 1953-02-23
Abstract
No abstract record available.
Inventors
- 👤 Crandell Dean De Forest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0092; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249959; Y10T428/24996; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
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) | 1936-10-30 | 1937-05-01 | 1937-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-30 | 1941-05-01 | 1941-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-30 | 1945-05-01 | 1945-10-31 | $7700.00 | Window Closed / Lapsed |