US3008969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-substituted-7-carboalkoxyamino-coumarins
Assignee: Wyeth Holdings LLC
•
Filing: 1958-05-21
•
Granted: 1961-11-14
•
Expires: 1978-05-21
Abstract
No abstract record available.
Inventors
- 👤 John E Pretka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:03
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/06; C07D311/08; C07D311/16; C07D311/78; C07D311/80; C07D311/92; C07D311/94
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
7-CARBETHOXYAMINO-4-METHYLCOUMARIN.
Claim 2
Dependent Claim
1 words
7-CARBETHOXYAMINO-4-METHYLCOUMARIN.
Claim 3
Dependent Claim
18 words
A PROCESS OF PREPARING ESTERS OF COUMARIN-7-N-CARBAMIC ACIDS WHICH COMPRISES MIXING A BETA KETO ESTER OF THE FORMULA
Claim 4
Dependent Claim
18 words
A PROCESS OF PREPARING ESTERS OF COUMARIN-7-N-CARBAMIC ACIDS WHICH COMPRISES MIXING A BETA KETO ESTER OF THE FORMULA
References Cited (Backward Citations)
US2647133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-13 | 1965-05-15 | 1965-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-13 | 1969-05-15 | 1969-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-13 | 1973-05-15 | 1973-11-14 | $7700.00 | Window Closed / Lapsed |