Patent US5713736A successfully refreshed from Google Patents.
Patent US2607751A successfully refreshed from Google Patents.
US2607751A
Expired / Lapsed
US
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Acrylonitrile polymer dissolved in a dicarboxylic acid anhydride
Assignee: EIDP Inc
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Filing: 1948-03-02
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Granted: 1952-08-19
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Expires: 1968-03-02
Abstract
No abstract record available.
Inventors
- 👤 Flanagan John Vernon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:16
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
AS A NEW COMPOSITION OF MATTER, A POLYMER OF ACRYLONITRILE WHICH CONTAINS IN THE POLYMER MOLECULE AT LEAST 85% BY WEIGHT OF ACRYLONITRILE IN ADMIXTURE WITH MORE THAN 10%, BASED ON THE TOTAL WEIGHT OF SAID COMPOSITION, OF A NON-HALOGENATED ORGANIC ANHYDRIDE CONTAINING NO MORE THAN FIVE CARBON ATOMS AND HAVING AT LEAST TWO ALPHA-HYDROGEN ATOMS, SAID ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE, CYCLOPROPANE-DICARBOXYLIC ANHYDRIDE AND AN ANHYDRIDE EMBRACED BY THE FORMULA
Claim 2
Dependent Claim
75 words
AS A NEW COMPOSITION OF MATTER, A POLYMER OF ACRYLONITRILE WHICH CONTAINS IN THE POLYMER MOLECULE AT LEAST 85% BY WEIGHT OF ACRYLONITRILE IN ADMIXTURE WITH MORE THAN 10%, BASED ON THE TOTAL WEIGHT OF SAID COMPOSITION, OF A NON-HALOGENATED ORGANIC ANHYDRIDE CONTAINING NO MORE THAN FIVE CARBON ATOMS AND HAVING AT LEAST TWO ALPHA-HYDROGEN ATOMS, SAID ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE, CYCLOPROPANE-DICARBOXYLIC ANHYDRIDE AND AN ANHYDRIDE EMBRACED BY 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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |