Patent US3245933A successfully refreshed from Google Patents.
US3245933A
Expired / Lapsed
US
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Styrene-maleic anhydride copolymers cross-linked with aliphatic polyhydroxy compounds
Assignee: Sinclair Research Inc
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Filing: 1960-05-19
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Granted: 1966-04-12
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Expires: 1980-05-19
Abstract
No abstract record available.
Inventors
- 👤 Irving E Muskat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/053; C08F; C08F8/00; C08F8/12; C08F8/14; C08F8/30; C08F8/32; C08F2800/00; C08F2800/10; C08F2800/20; C08F2810/00; C08F2810/20; C08F2810/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A MIXTURE COMPRISING (A) A PARTIALLY HALF ESTERIFIED COPOLYMER SELECTED FROM THE GROUP CONSISTING OF (1) PARTIALLY ESTERIFIED COPOLYMERS OF STYRENE AND MALEIC ANHYDRIDE PRODUCED BY COPOLYMERIZING A MALEIC COMPOUND WITH OLEFINIC COMPOUND COPOLYMERIZABLE THEREWITH AND HAVING THE FORMULA:
Claim 2
Dependent Claim
39 words
A MIXTURE COMPRISING (A) A PARTIALLY HALF ESTERIFIED COPOLYMER SELECTED FROM THE GROUP CONSISTING OF (1) PARTIALLY ESTERIFIED COPOLYMERS OF STYRENE AND MALEIC ANHYDRIDE PRODUCED BY COPOLYMERIZING A MALEIC COMPOUND WITH OLEFINIC COMPOUND COPOLYMERIZABLE THEREWITH AND HAVING THE FORMULA:
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |