Patent US3317477A successfully refreshed from Google Patents.
US3317477A
Expired / Lapsed
US
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Process for the preparation of styreneoxymethylene copolymers and resulting product
Assignee: British Industrial Plastics Ltd
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Filing: 1961-11-16
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Granted: 1967-05-02
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Expires: 1981-11-16
Abstract
No abstract record available.
Inventors
- 👤 Wilson Walter
- 👤 May Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:00
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08F; C08F2/00; C08F2/36; C08G2/10; C08G2/18; C08G2/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR THE PREPARATION OF AN OXYMETHYLENESTYRENE COPOLYMER MATERIAL CAPABLE OF FORMING FILMS WHICH COMPRISES REACTING TRIOXAN UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN THE PRESENCE OF AN ELECTROPHILIC CATALYST AT A TEMPERATURE BETWEEN 0*C. AND 100*C. WITH A COMPOUND SELECTED FROM THE CLASS CONSISTING OF STYRENE AND STYRENE DERIVATIVES SELECTED FROM THE GROUP CONSISTING OF RING-SUBSTITUTED STYRENES, ALPHA-SUBSTITUTED STYRENES, BETA-SUBSTITUTED STYRENES AND VINYL NAPHTHALENES, IN AN AMOUNT OF 0.5% TO 20% BY WEIGHT BASED ON THE TOTAL WEIGHT OF TRIOXAN AND SAID COMPOUND, THE WATER CONTENT OF THE REACTION MIXTURE BEING LESS THAN 0.1% BY WEIGHT.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE PREPARATION OF AN OXYMETHYLENESTYRENE COPOLYMER MATERIAL CAPABLE OF FORMING FILMS WHICH COMPRISES REACTING TRIOXAN UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN THE PRESENCE OF AN ELECTROPHILIC CATALYST AT A TEMPERATURE BETWEEN 0*C. AND 100*C. WITH A COMPOUND SELECTED FROM THE CLASS CONSISTING OF STYRENE AND STYRENE DERIVATIVES SELECTED FROM THE GROUP CONSISTING OF RING-SUBSTITUTED STYRENES, ALPHA-SUBSTITUTED STYRENES, BETA-SUBSTITUTED STYRENES AND VINYL NAPHTHALENES, IN AN AMOUNT OF 0.5% TO 20% BY WEIGHT BASED ON THE TOTAL WEIGHT OF TRIOXAN AND SAID COMPOUND, THE WATER CONTENT OF THE REACTION MIXTURE BEING LESS THAN 0.1% BY WEIGHT.
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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |