Patent US3380971A successfully refreshed from Google Patents.
US3380971A
Expired / Lapsed
US
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Chemical polymers
Assignee: EIDP Inc
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Filing: 1964-10-30
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Granted: 1968-04-30
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Expires: 1984-10-30
Abstract
No abstract record available.
Inventors
- 👤 John R Chalmers
- 👤 Frederic B Stilmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:07
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; C08; C08F; C08F16/00; C08F16/12; C08F16/14; C08F16/24; C08F214/00; C08F214/18; C08F214/26; C08F214/265; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |