Patent US3002002A successfully refreshed from Google Patents.
US3002002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of the thiophene nucleus
Assignee: Individual
•
Filing: 1957-04-02
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Granted: 1961-09-26
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Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Wender Irving
- 👤 Orchin Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:54
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/26; C07D333/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD FOR REDUCING A LOWER ALKYL 2-THIOPHENECARBOXYLATE TO THE CORRESPONDING LOWER ALKYL 2-THIACYCLOPENTANECARBOXYLATE WHICH COMPRISES, REACTING SAID LOWER ALKYL 2-THIOPHENECARBOXYLATE WITH HYDROGEN IN THE PRESENCE OF A COBALT CARBONYL CATALYST AT A TEMPERATURE OF ABOUT 110*C. TO ABOUT 220*C. UNDER A PRESSURE OF AT LEAST ABOUT 500 P.S.I., WHILE MAINTAINING A CONCENTRATION OF CARBON MONOXIDE IN THE REACTION ZONE AT LEAST SUFFICIENT TO PREVENT DECOMPOSITION OF THE COBALT CATALYST.
Claim 2
Independent Claim
70 words
A METHOD FOR REDUCING A LOWER ALKYL 2-THIOPHENECARBOXYLATE TO THE CORRESPONDING LOWER ALKYL 2-THIACYCLOPENTANECARBOXYLATE WHICH COMPRISES, REACTING SAID LOWER ALKYL 2-THIOPHENECARBOXYLATE WITH HYDROGEN IN THE PRESENCE OF A COBALT CARBONYL CATALYST AT A TEMPERATURE OF ABOUT 110*C. TO ABOUT 220*C. UNDER A PRESSURE OF AT LEAST ABOUT 500 P.S.I., WHILE MAINTAINING A CONCENTRATION OF CARBON MONOXIDE IN THE REACTION ZONE AT LEAST SUFFICIENT TO PREVENT DECOMPOSITION OF THE COBALT CATALYST.
References Cited (Backward Citations)
DE405017C
Cited
US2506536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-25 | 1965-03-27 | 1965-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-25 | 1969-03-27 | 1969-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-25 | 1973-03-27 | 1973-09-26 | $7700.00 | Window Closed / Lapsed |