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Patent US3818040A successfully refreshed from Google Patents.
US3818040A
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US
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Alkenyl and alkynyl substituted xanthone carboxylic acid compounds
Assignee: Roche Palo Alto LLC
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Filing: 1972-09-25
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Granted: 1974-06-18
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Expires: 1992-09-25
Abstract
Abstract Compositions containing and methods employing, as the essential ingredient(s), novel alkenyl and alkynyl substituted xanthone carboxylic acid compounds which are useful in the treatment of allergic conditions. Methods for preparing these compounds and compositions and intermediates therein are also disclosed. 7Vinylxanthone-2-carboxylic acid and 5-ethynylxanthone-2carboxylic acid are illustrated as representative of the class.
Inventors
- 👤 J Fried
- 👤 J Pfister
- 👤 I Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:42
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C07D311/84; C07D311/86
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
9 words
A compound according to claim 1 of Formula (A).
Claim 2
Dependent Claim
14 words
A compound according to claim 2 wherein R is a group of Formula (D).
Claim 3
Dependent Claim
11 words
A compound according to claim 3 wherein each R1 is hydrogen.
Claim 4
Dependent Claim
14 words
A compound according to claim 2 wherein R is a group of Formula (E).
Claim 5
Dependent Claim
10 words
A compound according to claim 5 wherein R1 is hydrogen.
Claim 6
Dependent Claim
9 words
A compound according to claim 1 of Formula (B).
Claim 7
Dependent Claim
9 words
A compound according to claim 1 of Formula (C).
Claim 8
Dependent Claim
14 words
A compound according to claim 8 wherein R is a group of Formula (D).
Claim 9
Dependent Claim
11 words
A compound according to claim 9 wherein each R1 is hydrogen.
Claim 10
Dependent Claim
14 words
A compound according to claim 8 wherein R is a group of Formula (E).
Claim 11
Dependent Claim
10 words
A compound according to claim 11 wherein R1 is hydrogen.
Claim 12
Dependent Claim
9 words
The sodium salt of a compound of claim 1.
Claim 13
Dependent Claim
10 words
The sodium salt according to claim 13 of Formula (C).
References Cited (Backward Citations)
US3706768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |