Patent US2887976A successfully refreshed from Google Patents.
Patent US3085994A successfully refreshed from Google Patents.
US3085994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain terminated copolymer of styrene and maleic anhydride of low solution viscosity
Assignee: Sinclair Research Inc
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Filing: 1959-10-30
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Granted: 1963-04-16
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Expires: 1979-10-30
Abstract
No abstract record available.
Inventors
- 👤 Irving E Muskat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:40
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; C08F222/08; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A CHAIN TERMINATED COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE IN MOLAR PROPORTIONS OF SUBSTANTIALLY 1:1, SAID COPOLYMER BEING SOLID AT ROOM TEMPERATURE, HAVING A SOLUTION VISCOISITY IN 10% SLUTION IN ACETONE OF UP TO 1 CENTISTOKE AND MELTING UNSHARPLY AT A TEMPERATURE OF LESS THAN 225*C.
Claim 2
Dependent Claim
46 words
A CHAIN TERMINATED COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE IN MOLAR PROPORTIONS OF SUBSTANTIALLY 1:1, SAID COPOLYMER BEING SOLID AT ROOM TEMPERATURE, HAVING A SOLUTION VISCOISITY IN 10% SLUTION IN ACETONE OF UP TO 1 CENTISTOKE AND MELTING UNSHARPLY AT A TEMPERATURE OF LESS THAN 225*C.
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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) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |