US4076729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
(4-Oxo-4H-1-benzopyran-3-yl)aminooxoacetic acids and their derivatives
Assignee: Warner Lambert Co LLC
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Filing: 1976-08-02
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Granted: 1978-02-28
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Expires: 1996-08-02
Abstract
Abstract The present invention relates to compounds of the formula: ##STR1## wherein R 1 is hydrogen, halogen, hydroxy, lower alkoxy or lower alkyl, R 2 is hydrogen or lower alkyl; R 3 is hydrogen or lower alkyl. These compounds, including their corresponding pharmaceutically acceptable salts, are useful in the management of allergic conditions such as hay fever and as a prophylactic in the treatment of bronchial asthma.
Inventors
- 👤 David T. Connor
- 👤 Patricia A. Young
- 👤 Max VON Strandtmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:10
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/22; C07C; C07C205/00; C07C205/45
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
38 words
A compound of the formula: ##STR16## wherein R 1 is hydrogen, halogen, lower alkoxy or lower alkyl; R 2 is hydrogen or lower alkyl; R 3 is hydrogen or lower alkyl and the corresponding pharmaceutically acceptable salts thereof.
Claim 2
Dependent Claim
38 words
A compound of the formula: ##STR16## wherein R 1 is hydrogen, halogen, lower alkoxy or lower alkyl; R 2 is hydrogen or lower alkyl; R 3 is hydrogen or lower alkyl and the corresponding pharmaceutically acceptable salts thereof.
Claim 3
Dependent Claim
10 words
A compound according to claim 1 which is ethyl (6-chloro-4-oxo-4H-1-benzopyran-3-yl)aminooxoacetate.
Claim 4
Dependent Claim
10 words
A compound according to claim 1 which is ethyl (4-oxo-4H-1-benzopyran-3-yl)aminooxoacetate.
Claim 5
Dependent Claim
10 words
A compound according to claim 1 which is ethyl (2-methyl-4-oxo-4H-1-benzopyran-3-yl)aminooxoacetate.
Claim 6
Dependent Claim
10 words
A compound according to claim 1 which is (6-chloro-4-oxo-4H-1-benzopyran-3-yl)aminooxoacetic acid.
Claim 7
Dependent Claim
10 words
A compound according to claim 1 which is (4-oxo-4H-1-benzopyran-3-yl)aminooxoacetic acid.
Claim 8
Dependent Claim
10 words
A compound according to claim 1 which is (2-methyl-4-oxo-4H-1-benzopyran-3-yl)aminooxoacetic acid.
Claim 9
Dependent Claim
10 words
A compound according to claim 1 which is ethyl (7-methoxy-4-oxo-4H-1-benzopyran-3-yl)aminooxoacetate.
Claim 10
Dependent Claim
10 words
A compound according to claim 1 which is (7-methoxy-4-oxo-4H-1-benzopyran-3-yl)aminooxoacetic acid.
References Cited (Backward Citations)
US3862143A
Cited
US3906005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |