US3172879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of nitrile polymers with a carboxylic acid
Assignee: —
•
Filing: —
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Granted: 1965-03-09
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:54
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
A METHOD OF MODIFYING THE PHYSICAL PROPERTIES OF POLYACRYLONITRILE HAVING AT LEAST 85 MOLE PERCENT OF ACRYLONITRILE MONOMERS, WHICH COMPRISES REACTING SAID POLYACRYLONITRILE WITH AN UNSUBSTITUTED CARBOXYLIC ACID SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC, ALICYCLIC AND AROMATIC CARBOXYLIC ACIDS AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 180 TO 130*C. FOR A PERIOD OF TIME SUFFICIENT TO REDUCE THE NITROGEN CONTENT OF SAID POLYACRYLONITRILE BY AT LEAST 5% OF ITS ORIGINAL NITROGEN CONTENT, WITH AT LEAST PART OF THE NITROGEN REMOVED FROM SAID POLYACRYLONITRILE COMBINING WITH SAID CARBOXYLIC ACID WITH FORMATION OF THE NITRILE OF SAID CARBOXYLIC ACID.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |