Patent US2658902A successfully refreshed from Google Patents.
US2658902A
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Thiophene polymers
Assignee: ExxonMobil Oil Corp
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Filing: 1948-12-10
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Granted: 1953-11-10
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Expires: 1968-12-10
Abstract
No abstract record available.
Inventors
- 👤 George C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:20
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/08; F; F01; F01D; F01D5/00; F01D5/30; C10; C10M; C10M2207/00; C10M2207/40; C10M2207/404; C10M2221/00; C10M2221/02; C10N; C10N2040/00; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; C10N2040/12; C10N2040/13; C10N2040/135; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A METHOD FOR OBTAINING NEW THIOPHLENE AND ALKYL THIOPHENE POLYMERS, WHICH COMPRISES CONTACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIOPHENE AND MONOALKYL THIOPHENE, AS THE SOLE REACTANT, WITH A SOLID SILICA-ALUMINA CATALYST, AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 200* C. AND FOR A SUFFICIENT LENGTH OF TIME TO PERMIT POLYMERIZATION TO TAKE PLACE.
Claim 2
Independent Claim
58 words
A METHOD FOR OBTAINING NEW THIOPHLENE AND ALKYL THIOPHENE POLYMERS, WHICH COMPRISES CONTACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIOPHENE AND MONOALKYL THIOPHENE, AS THE SOLE REACTANT, WITH A SOLID SILICA-ALUMINA CATALYST, AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 200* C. AND FOR A SUFFICIENT LENGTH OF TIME TO PERMIT POLYMERIZATION TO TAKE PLACE.
References Cited (Backward Citations)
US1896227A
Cited
US1877478A
Cited
US1996334A
Cited
US2448211A
Cited
US2450658A
Cited
US2458521A
Cited
US2477502A
Cited
US2521514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |