US3029221A
Expired / Lapsed
US
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Process for the production of graft copolymers comprising reacting (polystyryl) alkali metal compounds with resins containing certain reactive pendant groups
Assignee: Union Carbide Corp
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Filing: 1958-07-17
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Granted: 1962-04-10
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Expires: 1978-07-17
Abstract
No abstract record available.
Inventors
- 👤 Frank J Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:24
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/021; Y; Y10; Y10S; Y10S8/00; Y10S8/09; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS FOR THE PRODUCTION OF POLYSTYRENE GRAFT COPOLYMERS, WHICH COMPRISES REACTING AT FROM 0* C. UP TO THE RELFUX TEMPERATURE OF THE REACTION MIXTURE IN AN ANHYDROUS, INERT ORGANIC DILUENT, (POLYSTYRYL) ALKALI METAL COMPOUNDS REPRESENTED BY THE GENERAL FORMULA:
Claim 2
Dependent Claim
40 words
A PROCESS FOR THE PRODUCTION OF POLYSTYRENE GRAFT COPOLYMERS, WHICH COMPRISES REACTING AT FROM 0* C. UP TO THE RELFUX TEMPERATURE OF THE REACTION MIXTURE IN AN ANHYDROUS, INERT ORGANIC DILUENT, (POLYSTYRYL) ALKALI METAL COMPOUNDS REPRESENTED BY THE GENERAL 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) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |