Patent US2764570A successfully refreshed from Google Patents.
US2764570A
Expired / Lapsed
US
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Copolymers of acrylonitrile with dicarboxylic acid hydrazides
Assignee: Acordis UK Ltd
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Filing: 1953-06-30
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Granted: 1956-09-25
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Expires: 1973-06-30
Abstract
No abstract record available.
Inventors
- 👤 Kowolik Ernest Jan
- 👤 Fisher James Wotherspoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:03
CPC Classifications
C; C08; C08F; C08F22/00; C08F220/00; C08F220/02; C08F220/42; C08F220/44; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A COPOLYMER OF ACRYLONITRILE WITH A DERIVATIVE OF AN A,B MONOOLEFINIC DICARBOXYLIC ACID, SAID DERIVATIVE BEING SELECTED FROM THE CLASS CONSISTING OF HYDROAZIDES AND HYDRAZINIUM SALTS OF SAID ACID.
Claim 2
Dependent Claim
29 words
A COPOLYMER OF ACRYLONITRILE WITH A DERIVATIVE OF AN A,B MONOOLEFINIC DICARBOXYLIC ACID, SAID DERIVATIVE BEING SELECTED FROM THE CLASS CONSISTING OF HYDROAZIDES AND HYDRAZINIUM SALTS OF SAID ACID.
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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |