Patent US3202640A successfully refreshed from Google Patents.
US3202640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing acrylonitrile-beta-[1-vinyl-imidazolyl-(4)]-alkylsulfates polymers
Assignee: Teijin Ltd
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Filing: 1961-07-14
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Granted: 1965-08-24
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Expires: 1981-07-14
Abstract
No abstract record available.
Inventors
- 👤 Taniyama Masakazu
- 👤 Kawakatsu Michihiko
- 👤 Sawa Natsuo
- 👤 Iwasaki Yasuhiro
- 👤 Yoshida Masatoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:27
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F220/46; C08F28/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
52 words
A METHOD OF PREPARING POLYMERIC MATERIALS WHICH COMPRISES COPOLYMERIZING IN THE PRESENCE OF A FREE RADICAL CATALYST A COMPOUND OF ACRYLONITRILE AND A MONOMER, SAID ACRYLONITRILE BEING AT LEAST 85% BY WEIGHT OF THE COMPOUND AND SAID MONOMER BEING THE REMAINING PERCENTAGE BY WEIGHT OF THE COMPOUND, SAID MONOMER HAVING THE STRUCTURE:
Claim 2
Independent Claim
52 words
A METHOD OF PREPARING POLYMERIC MATERIALS WHICH COMPRISES COPOLYMERIZING IN THE PRESENCE OF A FREE RADICAL CATALYST A COMPOUND OF ACRYLONITRILE AND A MONOMER, SAID ACRYLONITRILE BEING AT LEAST 85% BY WEIGHT OF THE COMPOUND AND SAID MONOMER BEING THE REMAINING PERCENTAGE BY WEIGHT OF THE COMPOUND, SAID MONOMER HAVING THE STRUCTURE:
Claim 3
Dependent Claim
68 words
THE METHOD AS RECITED IN CLAIM 1 WHEREIN A THIRD MONOMER IS COPOLYMERIZED WITH SAID ACRYLONITRILE AND SAID MONOMER, SAID THIRD MONOMER HAVING AN UNSATURATED OLEFINIC FUNCTION THEREIN AND BEING NOT MORE THAN 10% BY WEIGHT OF THE MONOMER MIXTURE, AND SAID THIRD MONOMER IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID, AN ESTER OF ACRYLIC ACID, METHACRYLIC ACID AND AN ESTER OF METHACRYLIC ACID.
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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |