US1657172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making compound cellulose-ester plastic
Assignee: DuPont Viscoloid Co
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Filing: 1923-10-30
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Granted: 1928-01-24
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Expires: 1943-10-30
Abstract
No abstract record available.
Inventors
- 👤 Karl W Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:15
CPC Classifications
B; B44; B44C; B44C3/00; B44C3/02; B44C3/025; Y; Y10; Y10S; Y10S264/00; Y10S264/54; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T156/1052; Y10T156/1062; Y10T156/1075
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) | 1931-01-23 | 1931-07-25 | 1932-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-01-23 | 1935-07-25 | 1936-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-01-23 | 1939-07-25 | 1940-01-24 | $7700.00 | Window Closed / Lapsed |