US3766301A
Expired / Lapsed
US
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Preparation of polymers of increased average molecular weight from mono lithium terminated block co polymers coupled with certain aryl monoesters
Assignee: Shell USA Inc
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Filing: 1971-05-21
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Granted: 1973-10-16
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Expires: 1991-05-21
Abstract
Abstract HIGH COUPLING EFFICIENCY FOR THE PRODUCTION OF HALOGENFREE COUPLED BLOCK COPOLYMERS IS EFFECTED BY THE USE AS THE COUPLING AGENT OF ARYL MONOESTERS WHICH ARE FREE FROM HYDROGEN SUBSTITUENTS IN THE POSITION ALPHA TO THE CARBOXYL GROUP SUCH AS PHENYL BENZOATE.
Inventors
- 👤 La Mare H De
- 👤 C Wilcoxen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:35
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; Y; Y10; Y10S; Y10S525/00; Y10S525/904
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |