US3553160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stable methacrylonitrile methacrylic acid copolymers
Assignee: Roehm GmbH Darmstadt
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Filing: 1967-10-03
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Granted: 1971-01-05
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Expires: 1987-10-03
Abstract
Abstract A METHOD FOR MAKING HEAT-STABLE COPOLYMERS OF METHACRYLONITRILE AND METHACRYLIC ACID OPTIONALLY CONTAINING LESSER AMOUNTS OF OTHER COPOLYMERIZABLE OLEFINICALLY UNSATURATED COMONOMERS, PRINCIPALLY STYRENE OR A LOWER ACRYLATE, BY COPOLYMERIZING THE MONOMERS AND HEATING THE RESULTANT COPOLYMER AT 150*-250*C. IN THE PRESENCE OF A METAL SALT ADDITIVE TO IMPROVE OPTICAL CLARITY OF THE COPOLYMERS, SAID SALT BEING A SALT OF A POLYVALENT METAL AND AN UNSATURATED COPOLYMERIZABLE MONOCARBOXYLIC OR DICARBOXYLIC ACID.
Inventors
- 👤 Gunter Schroder
- 👤 Wolfgang Philipp Ganzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:52
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08F20/00; C08F20/02; C08F20/42; C08F20/50; C08F8/00; C08F8/48; C08J; C08J3/00; C08J3/24; C08F220/42; C08F220/44; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/20; Y; Y10; Y10S; Y10S526/00; Y10S526/937
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |