Patent US2691640A successfully refreshed from Google Patents.
US2691640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylonitrile-dimethylamino-methylstyrene copolymers
Assignee: EIDP Inc
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Filing: 1951-03-13
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Granted: 1954-10-12
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Expires: 1971-03-13
Abstract
No abstract record available.
Inventors
- 👤 Hugh T Patterson
- 👤 Irving D Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:50
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
30 words
AN ARTICLE COMMERCE COMPRISING A FIBROUS POLYMER COMPRISING FROM 2% TO 10% BY WEIGHT OF P-DIMETHYLAMINOMETHYLSTYRENE AND CORRESPONDINGLY FROM 98% TO 90% BY WEIGHT OF ACRYLONITRILE, AND AN ORGANIC DYESTUFF.
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) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |