Patent US2883497A successfully refreshed from Google Patents.
Patent US1815761A successfully refreshed from Google Patents.
US1815761A
Expired / Lapsed
US
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Treatment of vegetable fibers of osmotic diaphragms
Assignee: Individual
•
Filing: 1929-08-23
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Granted: 1931-07-21
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Expires: 1949-08-23
Abstract
No abstract record available.
Inventors
- 👤 Cerini Leonardo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:40
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/38
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) | 1934-07-20 | 1935-01-19 | 1935-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-07-20 | 1939-01-19 | 1939-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-07-20 | 1943-01-19 | 1943-07-21 | $7700.00 | Window Closed / Lapsed |