US2606891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of styrene-maleic copolymers
Assignee: Rohm and Haas Co
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Filing: 1949-06-01
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Granted: 1952-08-12
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Expires: 1969-06-01
Abstract
No abstract record available.
Inventors
- 👤 Stanley P Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:02
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR PREPARING COPOLYMERS OF STYREN AND MALEIC ANHYDRIDE HAVING MOELECULAR WEIGHTS FROM 100 TO 2400 WHICH CONSISTS OF COPOLYMERIZING STYRENE AND MALEIC ANHYDRIDE IN SOLUTION IN AN INERT ORGANIC SOLVENT AT A TEMPERATURE OF 90* C. TO 125* C. WITH AN ORGANIC PEROXIDE CATALYST IN THE PRESENCE OF A DISSOLVED MERCAPTAN CONTAINING 5 TO 12 CARBON ATOMS AND BEING PRESENT IN AN AMOUNT EQUAL TO 5% TO 25% OF THE WEIGHT OF THE STYRENE AND MALEIC ANHYDRIDE.
Claim 2
Dependent Claim
79 words
A PROCESS FOR PREPARING COPOLYMERS OF STYREN AND MALEIC ANHYDRIDE HAVING MOELECULAR WEIGHTS FROM 100 TO 2400 WHICH CONSISTS OF COPOLYMERIZING STYRENE AND MALEIC ANHYDRIDE IN SOLUTION IN AN INERT ORGANIC SOLVENT AT A TEMPERATURE OF 90* C. TO 125* C. WITH AN ORGANIC PEROXIDE CATALYST IN THE PRESENCE OF A DISSOLVED MERCAPTAN CONTAINING 5 TO 12 CARBON ATOMS AND BEING PRESENT IN AN AMOUNT EQUAL TO 5% TO 25% OF THE WEIGHT OF THE STYRENE AND MALEIC ANHYDRIDE.
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) | 1955-08-12 | 1956-02-11 | 1956-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-12 | 1960-02-11 | 1960-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-12 | 1964-02-11 | 1964-08-12 | $7700.00 | Window Closed / Lapsed |