Patent US2873240A successfully refreshed from Google Patents.
US2873240A
Expired / Lapsed
US
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Preparation of graft copolymers
Assignee: Wyeth Holdings LLC
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Filing: 1956-08-22
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Granted: 1959-02-10
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Expires: 1976-08-22
Abstract
No abstract record available.
Inventors
- 👤 Mary L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:05
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/08; C08F20/00; C08F20/02; C08F20/42; C08F20/50; Y; Y10; Y10S; Y10S8/00; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A PROCESS FOR PREPARING GRAFT COPOLYMERS WHICH COMPRISE PREPARING A BACKBONE POLYMER BY POLYMERIZING IN THE PRESENCE OF A-CHLOROACRYLONITRILE. A MONOMER SELECTED FROM THE GROUP OF COMPOUNDS HAVING THE GENERAL FORMULAS
Claim 2
Dependent Claim
31 words
A PROCESS FOR PREPARING GRAFT COPOLYMERS WHICH COMPRISE PREPARING A BACKBONE POLYMER BY POLYMERIZING IN THE PRESENCE OF A-CHLOROACRYLONITRILE. A MONOMER SELECTED FROM THE GROUP OF COMPOUNDS HAVING THE GENERAL FORMULAS
References Cited (Backward Citations)
US2666025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |