US3887574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxamido tetrazolo chromones
Assignee: Allen and Hanburys Ltd
•
Filing: 1972-09-29
•
Granted: 1975-06-03
•
Expires: 1992-09-29
Abstract
Abstract IN WHICH R is a chromone, xanthone or anthraquinone group. These compounds inhibit release of spasmogen mediators from antigen-antibody reactions. Compounds of the general formula:
Inventors
- 👤 Gwynn Pennant Ellis
- 👤 Mervyn Evan Peel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:31
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; A; A61; A61P; A61P37/00; A61P37/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 3
Dependent Claim
5 words
A compound having the formula
Claim 4
Dependent Claim
5 words
A compound having the formula
Claim 5
Dependent Claim
10 words
The compound as claimed in claim 1 in which 6-methyl-N(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide.
Claim 6
Dependent Claim
15 words
The compound as claimed in claim 1 which is N-(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide or its sodium trihydrate salt.
Claim 7
Dependent Claim
10 words
The compound as claimed in claim 1 which is 7-methyl-N-(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide.
Claim 8
Dependent Claim
10 words
The dimethylaminoethanol salt of the compound claimed in claim 4.
Claim 9
Dependent Claim
10 words
The compound as claimed in claim 1 which is 6-cyano-N-(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide.
Claim 10
Dependent Claim
10 words
The compound as claimed in claim 1 which is N,N''-Di(1H-tetrazol-5-yl)-4-oxochromen-2,6-dicarboxamide.
Claim 11
Dependent Claim
10 words
The compound as claimed in claim 1 which is 7-Hydroxy-N-(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide.
Claim 12
Dependent Claim
10 words
The compound as claimed in claim 1 which is 6-Nitro-N-(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide.
Claim 13
Dependent Claim
10 words
The compound as claimed in claim 1 which is 7-methoxy-N-(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide.
Claim 14
Dependent Claim
10 words
The compound as claimed in claim 1 which is N,6-Di(1H-tetrazol-5-yl)-4-oxochromen-2-carboxamide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |