Patent FR663521A successfully refreshed from Google Patents.
Patent US2252554A successfully refreshed from Google Patents.
US2252554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric material
Assignee: Wilmington Trust Co
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Filing: 1938-09-19
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Granted: 1941-08-12
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Expires: 1958-09-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/56; C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265; Y; Y10; Y10S; Y10S273/00; Y10S273/06; Y10S36/00; Y10S36/02
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) | 1944-08-11 | 1945-02-10 | 1945-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-11 | 1949-02-10 | 1949-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-11 | 1953-02-10 | 1953-08-12 | $7700.00 | Window Closed / Lapsed |