Patent US2251508A successfully refreshed from Google Patents.
US2251508A
Expired / Lapsed
US
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Treatment of polyamides
Assignee: EIDP Inc
•
Filing: 1939-08-04
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Granted: 1941-08-05
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Expires: 1959-08-04
Abstract
No abstract record available.
Inventors
- 👤 Frederick K Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:46
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/58; D06M11/66; D06M11/51; D06M11/54; D06M11/68; D06M11/69; D06M13/00; D06M13/10; D06M13/184; D06M13/207; D06M13/21
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) | 1944-08-04 | 1945-02-03 | 1945-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-04 | 1949-02-03 | 1949-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-04 | 1953-02-03 | 1953-08-05 | $7700.00 | Window Closed / Lapsed |