Patent US4200063A successfully refreshed from Google Patents.
US3120504A
Expired / Lapsed
US
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Art of producing acrylonitrile polymers
Assignee: Wyeth Holdings LLC
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Filing: 1959-11-20
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Granted: 1964-02-04
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Expires: 1979-11-20
Abstract
No abstract record available.
Inventors
- 👤 Peter A Jarovitzky
- 👤 Wishman Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:00
CPC Classifications
C; C08; C08J; C08J3/00; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F6/00; C08F6/008; C08F8/00; C08F8/34; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/20; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE PRODUCTION OF A FILAMENT-FORMING POLYMER COMPRISED OF, BY WEIGHT, A MAJOR AMOUNT OF ACRYLONITRILE AND A MINOR AMOUNT OF A VINYLPYRDINE COMBINED IN THE POLYMER MOLECULE, THE IMPROVEMENT WHICH COMPRISES CONTACTING, AT 40*C. TO 80*C., AN UNDISSOLVED, INORGANIC ACID SALT FORM OF THE SAID POLYMER WITH A LIQUID TREATING AGENT MAINTAINED AT A PH RANGING BETWEEN 5.0 AND 7.5 BY THE ADDITION OF AQUEOUS AMMONIA SOLUTION AND IN WHICH THE SAID POLYMER IS INSOLUBLE, THEREBY TO REDUCE SUBSTANTIALLY THE AMOUNT OF INORGANIC ACID THAT IS PRESENT AS A SALT IN THE SAID POLYMER.
Claim 2
Dependent Claim
95 words
IN THE PRODUCTION OF A FILAMENT-FORMING POLYMER COMPRISED OF, BY WEIGHT, A MAJOR AMOUNT OF ACRYLONITRILE AND A MINOR AMOUNT OF A VINYLPYRDINE COMBINED IN THE POLYMER MOLECULE, THE IMPROVEMENT WHICH COMPRISES CONTACTING, AT 40*C. TO 80*C., AN UNDISSOLVED, INORGANIC ACID SALT FORM OF THE SAID POLYMER WITH A LIQUID TREATING AGENT MAINTAINED AT A PH RANGING BETWEEN 5.0 AND 7.5 BY THE ADDITION OF AQUEOUS AMMONIA SOLUTION AND IN WHICH THE SAID POLYMER IS INSOLUBLE, THEREBY TO REDUCE SUBSTANTIALLY THE AMOUNT OF INORGANIC ACID THAT IS PRESENT AS A SALT IN THE SAID POLYMER.
References Cited (Backward Citations)
US2564726A
Cited
US2936211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-03 | 1967-08-05 | 1968-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-03 | 1971-08-05 | 1972-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-03 | 1975-08-05 | 1976-02-04 | $7700.00 | Window Closed / Lapsed |