US2630437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing beta keto esters of thiophenes
Assignee: Mallinckrodt Chemical Works
•
Filing: 1947-11-19
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Granted: 1953-03-03
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Expires: 1967-11-19
Abstract
No abstract record available.
Inventors
- 👤 August H Homeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:47
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
THE PROCESS COMPRISING MIXTURE A 2-THIENYL KETONE OF THE FOLLOWING TYPE FORMULA:
Claim 2
Dependent Claim
12 words
THE PROCESS COMPRISING MIXTURE A 2-THIENYL KETONE OF THE FOLLOWING TYPE FORMULA:
References Cited (Backward Citations)
US1996007A
Cited
GB507611A
Cited
US2288863A
Cited
US2367632A
Cited
US2442027A
Cited
US2439098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-02 | 1956-09-01 | 1957-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-02 | 1960-09-01 | 1961-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-02 | 1964-09-01 | 1965-03-03 | $7700.00 | Window Closed / Lapsed |