Patent US3803264A successfully refreshed from Google Patents.
US3803264A
Expired / Lapsed
US
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Manufacture of impact-resistant olefinic-nitrile copolymers
Assignee: Standard Oil Co
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Filing: 1972-02-25
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Granted: 1974-04-09
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Expires: 1992-02-25
Abstract
Abstract IMPACT-RESISTANT POLYMERS WHICH HAVE LOW PERMEABILITY TO GASES AND VAPORS ARE PREPARED BY POLYMERIZING AN OLEFINIC NITRILE, SUCH AS ACRYLONITRILE, WITH A VINYL ETHER, SUCH AS BUTYL VINYL ETHER, TO AT LEAST ABOUT 50% CONVERSION, AND THEN INTRODUCING INTO THE POLYMERIZATION REACTION MEDIUM A CONJUFATED DIENE MONOMER, SUCH AS BUTADIENE-1,3, AND COMPLETING THE POLYMERIZATION REACTION IN THE PRESENCE OF SAID DIENE MONOMER.
Inventors
- 👤 R Griffith
- 👤 J Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:36
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F265/00; C08F265/08
Claims Analysis
Total Claims: 0
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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) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |