Patent US1798609A successfully refreshed from Google Patents.
US1798609A
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US
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Plaster-board manufacture
Assignee: Certainteed LLC
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Filing: 1927-04-05
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Granted: 1931-03-31
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Expires: 1947-04-05
Abstract
No abstract record available.
Inventors
- 👤 Theodore E Knowlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:47
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0092; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157; Y10T428/2419; Y10T428/24752; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249968
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) | 1934-03-30 | 1934-09-29 | 1935-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-03-30 | 1938-09-29 | 1939-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-03-30 | 1942-09-29 | 1943-03-31 | $7700.00 | Window Closed / Lapsed |