Patent US2521514A successfully refreshed from Google Patents.
US2521514A
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Phosphoric acid polymerization of thiophene compounds
Assignee: ExxonMobil Oil Corp
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Filing: 1948-07-15
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Granted: 1950-09-05
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Expires: 1968-07-15
Abstract
No abstract record available.
Inventors
- 👤 Howard D Hartough
- 👤 Seymour L Meisel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:26
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR POLYMERIZATION OF A THIOPHENE COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIOPHENE AND ALKYLTHIOPHENES, WHICH COMPRISES CONTACTING SAID COMPOUND AT A TEMPERATURE OF NOT LESS THAN ABOUT 50*C. WITH A CATALYST OF APPROXIMATELY 100 PER CENT ORTHOPHOSPHORIC ACID FOR A PERIOD OF TIME SUFFICIENT TO EFFECT POLYMERIZATION AND THEREAFTER REMOVING POLYMER OF SAID THIOPHENE COMPOUND AS A REACTION PRODUCT.
Claim 2
Dependent Claim
62 words
A PROCESS FOR POLYMERIZATION OF A THIOPHENE COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIOPHENE AND ALKYLTHIOPHENES, WHICH COMPRISES CONTACTING SAID COMPOUND AT A TEMPERATURE OF NOT LESS THAN ABOUT 50*C. WITH A CATALYST OF APPROXIMATELY 100 PER CENT ORTHOPHOSPHORIC ACID FOR A PERIOD OF TIME SUFFICIENT TO EFFECT POLYMERIZATION AND THEREAFTER REMOVING POLYMER OF SAID THIOPHENE COMPOUND AS A REACTION PRODUCT.
References Cited (Backward Citations)
US2458520A
Cited
US2458514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |