US2552978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing thiophene carboxylic acids
Assignee: Texaco Inc
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Filing: 1949-04-12
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Granted: 1951-05-15
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Expires: 1969-04-12
Abstract
No abstract record available.
Inventors
- 👤 Kenneth L Kreuz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:18
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/26; C07D333/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD FOR INTRODUCING A -COOR GROUP, WHEREIN R IS AN ALIPHATIC GROUP, INTO A THIOPHENE NUCLEUS WHICH COMPRISES REACTING A COMPOUND CONTAINING A THIOPHENE NUCLEUS IN WHICH THERE IS AT LEAST ONE ALPHA HYDROGEN ATOM WITH CARBON TETRACHLORIDE AND AN ALKALI METALY HYDROXIDE IN AN ALCOHOLIC SOLVENT OF THE GENERAL FORMULA ROH, SAID R IN SAID ROH AND SAID COOR BEING THE SAME ALIPHATIC GROUP AT A TEMPERATURE BETWEEN 65 AND 210* C.
Claim 2
Independent Claim
74 words
A METHOD FOR INTRODUCING A -COOR GROUP, WHEREIN R IS AN ALIPHATIC GROUP, INTO A THIOPHENE NUCLEUS WHICH COMPRISES REACTING A COMPOUND CONTAINING A THIOPHENE NUCLEUS IN WHICH THERE IS AT LEAST ONE ALPHA HYDROGEN ATOM WITH CARBON TETRACHLORIDE AND AN ALKALI METALY HYDROXIDE IN AN ALCOHOLIC SOLVENT OF THE GENERAL FORMULA ROH, SAID R IN SAID ROH AND SAID COOR BEING THE SAME ALIPHATIC GROUP AT A TEMPERATURE BETWEEN 65 AND 210* C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |