Patent US2899676A successfully refreshed from Google Patents.
US2249686A
Expired / Lapsed
US
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Polymeric material
Assignee: EIDP Inc
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Filing: 1938-09-29
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Granted: 1941-07-15
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Expires: 1958-09-29
Abstract
No abstract record available.
Inventors
- 👤 Harry B Dykstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:13
CPC Classifications
C; C08; C08L; C08L77/00; C08L21/00; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08L7/00; D; D01; D01F; D01F6/00; D01F6/58; D01F6/60
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) | 1944-07-14 | 1945-01-13 | 1945-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-14 | 1949-01-13 | 1949-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-14 | 1953-01-13 | 1953-07-15 | $7700.00 | Window Closed / Lapsed |