Patent US2569157A successfully refreshed from Google Patents.
US2569157A
Expired / Lapsed
US
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Method of molding structural slabs of cement and fiber
Assignee: Individual
•
Filing: 1949-07-08
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Granted: 1951-09-25
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Expires: 1969-07-08
Abstract
No abstract record available.
Inventors
- 👤 Evensen Sverre Wilfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:09
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/52; B28B1/525; Y; Y10; Y10S; Y10S264/00; Y10S264/57
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |