Patent US4026894A successfully refreshed from Google Patents.
US4026894A
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Antihypertensive agents
Assignee: Abbott Laboratories
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Filing: 1975-10-14
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Granted: 1977-05-31
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Expires: 1995-10-14
Abstract
Abstract Described are antihypertensive agents selected from the class consisting of 2[4(tetrahydro-2-furoyl)-piperazino]-4-amino-6,7-dimethoxyquinazoline and 2-[4(tetrahydropyran-2-carbonyl)-piperazinyl]-4-amino-6,7-dimethoxyquinazoline, and pharmaceutically acceptable acid addition salts thereof. The compounds are highly water soluble and can be administered in time release form as well as parenterally, including intravenously.
Inventors
- 👤 Martin Winn
- 👤 Jaroslav Kyncl
- 👤 Daniel Ambrose Dunnigan
- 👤 Peter Hadley Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:04
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/02; C07D309/08; A; A61; A61P; A61P25/00; A61P25/04; A61P9/00; A61P9/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
18 words
A compound selected from the group consisting of 2-[4(tetrahydro-2-furoyl)-piperazino]-4-amino-6,7-dimethoxyquinazoline and 2-[4(tetrahydropyran-2-carbonyl)piperazinyl]-4-amino-6,7-dimethoxyquinazoline and pharmaceutically acceptable acid addition salts thereof.
Claim 2
Dependent Claim
18 words
A compound selected from the group consisting of 2-[4(tetrahydro-2-furoyl)-piperazino]-4-amino-6,7-dimethoxyquinazoline and 2-[4(tetrahydropyran-2-carbonyl)piperazinyl]-4-amino-6,7-dimethoxyquinazoline and pharmaceutically acceptable acid addition salts thereof.
Claim 3
Dependent Claim
9 words
A compound in accordance with Claim 1: 2-[4(tetrahydro-2-furoyl)-piperazino]-4-amino-6,7-dimethoxyquinazoline hydrochloride.
Claim 4
Dependent Claim
9 words
A compound in accordance with Claim 1: 2-[4(tetrahydropyran-2-carbonyl)piperazinyl]-4-amino-6,7-dimethoxyquinazoline hydrochloride.
References Cited (Backward Citations)
US3511836A
Cited
US3920636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |