US3728346A
Expired / Lapsed
US
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Hydroxyphenylhydroxyalkylaminoalkyltheophyllines
Assignee: DEUTSCHE GOLD und SILBER SCHEIDEANSTALT DT
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Filing: 1971-07-16
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Granted: 1973-04-17
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Expires: 1991-07-16
Abstract
Abstract Compounds are prepared having the formula Where R1 and R2 are alkyl of one to four carbon atoms or one of them is hydrogen, R3 is hydrogen or alkyl of one to two and n is 1 or 2 or a salt thereof. The compounds have outstanding broncholytic activity.
Inventors
- 👤 K Klingler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:50
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
A compound according to claim 1 wherein all alkyl groups are methyl groups.
Claim 2
Dependent Claim
25 words
A compound according to claim 1 wherein n is 2 and the hydroxyl groups are in the 3.5 or 3,4 positions on the phenyl group.
Claim 3
Dependent Claim
12 words
A compound according to claim 3 wherein R1 and R3 are hydrogen.
Claim 4
Dependent Claim
10 words
A compound according to claim 4 wherein R2 is methyl.
Claim 5
Dependent Claim
12 words
A compound according to claim 3 wherein R2 and R3 are hydrogen.
Claim 6
Dependent Claim
10 words
A compound according to claim 6 wherein R1 is methyl.
Claim 7
Dependent Claim
25 words
A compound according to claim 1 where n is 1 AND the hydroxyl group is in the 3, or 4 position on the phenyl group.
Claim 8
Dependent Claim
16 words
A compound according to claim 8 wherein R1 and R3 are hydrogen and R2 is methyl.
Claim 9
Dependent Claim
16 words
A compound according to claim 8 wherein R2 and R3 are hydrogen and R1 is methyl.
References Cited (Backward Citations)
BE675042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |