US3234196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of lithium substituted polystyrene polymers
Assignee: Dow Chemical Co
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Filing: 1961-03-23
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Granted: 1966-02-08
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Expires: 1981-03-23
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Leavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:06
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD FOR FORMING POLYMERS COMPRISING REACTING A POLYSTYRENE HAVING LITHIUM SUBSTITUENT GROUPS IN THE PHENYL NUCLEUS OF SAID POLYSTYRENE, WITH A COREACTANT SELECTED FROM THE GROUP CONSISTING OF PHENYL ISOCYANATE, THE BENZOIL GROUP, EPIHALOHYDRIN COMPOUNDS VINYLBENZYLHALIDES, STYRENE, ISOPRENE, STYRENE OXIDE, ACETONE, AND ALKYLCHLOROFORMATE ESTERS, IN A SOLVENT AT A TEMPERATURE BETWEEN-80*C. AND 40*C. IN AN INERT ATMOSPHERE, AND THEREAFTER NEUTRALIZING AND RECOVERING THE POLYMER AS THE END PRODUCT.
Claim 2
Independent Claim
69 words
THE METHOD FOR FORMING POLYMERS COMPRISING REACTING A POLYSTYRENE HAVING LITHIUM SUBSTITUENT GROUPS IN THE PHENYL NUCLEUS OF SAID POLYSTYRENE, WITH A COREACTANT SELECTED FROM THE GROUP CONSISTING OF PHENYL ISOCYANATE, THE BENZOIL GROUP, EPIHALOHYDRIN COMPOUNDS VINYLBENZYLHALIDES, STYRENE, ISOPRENE, STYRENE OXIDE, ACETONE, AND ALKYLCHLOROFORMATE ESTERS, IN A SOLVENT AT A TEMPERATURE BETWEEN-80*C. AND 40*C. IN AN INERT ATMOSPHERE, AND THEREAFTER NEUTRALIZING AND RECOVERING THE POLYMER AS THE END PRODUCT.
References Cited (Backward Citations)
US3135716A
Cited
US3177190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |