US3297794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer product comprising methacrylic ester and alpha-methylstyrene, and processes of producing same
Assignee: Kurashiki Rayon Co Ltd
•
Filing: 1963-04-19
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Granted: 1967-01-10
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Expires: 1983-04-19
Abstract
No abstract record available.
Inventors
- 👤 Imai Kiyokazu
- 👤 Sakurada Yutaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:23
CPC Classifications
C; C08; C08F; C08F257/00; C08F257/02; C08L; C08L25/00; C08L25/02; C08L25/16; C08L33/00; C08L33/04; C08L33/06; C08L33/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A METHOD OF PRODUCING A POLYMER COMPOSITION CHARACTERIZED BY HIGH HEAT-RESISTANCE AND AT LEAST SUBSTANTIAL TRANSPARENCY WHICH POLYMER COMPOSITION CONSISTS ESSENTIALLY OF A MAJOR PROPORTION OF A MIXTURE OF METHACRYLIC ESTER POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYMETHACRYLATE, POLYETHYLMETHACRYLATE, POLYPROPYLMETHACRYLATE AND POLYCYCLOHEXYLMETHACRYLATE HAVING AT LEAST ABOUT 5% BY WEIGHT OF POLY-A-METHYLSTYRENE, WHICH COMPRISES POLYMERIZING A MAJOR PROPORTION OF A MIXTURE OF METHACRYLIC ESTER MONOMER SELECTED FROM THE GROUP CONSISTING OF METHYLMETHACRYLATE, ETHYLMETHACRYLATE, PROPYLMETHACRYLATE AND CYCLOHEXYL-METHACRYLATE HAVING AT LEAST ABOUT 5% BY WEIGHT OF POLY-A-METHYLSTYRENE DISSOLVED THEREIN IN THE PRESENCE OF THE FREE RADICAL POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF AZONITRILE AND PEROXIDE CATALYSTS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |