Patent US3621025A successfully refreshed from Google Patents.
US3621025A
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Imidazo and pyrimido{8 2,1-{11 {9 quinazoline compounds
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1969-12-18
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Granted: 1971-11-16
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Expires: 1989-12-18
Abstract
Abstract The compounds are tetrahydroimidazo (and pyrimido)-(2,1b)quinazolines which have hypotensive activity and in addition have central nervous system depressant activity.
Inventors
- 👤 Timothy Yu-Wen Jen
- 👤 Bernard Loev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:04
CPC Classifications
C; C07; C07D; C07D265/00; C07D265/04; C07D265/12; C07D265/14; C07D265/24; C07D265/26; C07D209/00; C07D209/02; C07D209/04; C07D209/30; C07D209/32; C07D209/38; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
A compound of claim 1 according to formula I in which R1 and R2 are hydrogen and n is 1.
Claim 2
Dependent Claim
21 words
A compound of claim 1 according to formula I in which R1 is chloro, R2 is hydrogen and n is 1.
Claim 3
Dependent Claim
21 words
A compound of claim 1 according to formula I in which R1 is trifluoromethyl, R2 is hydrogen and n is 1.
Claim 4
Dependent Claim
21 words
A compound of claim 1 according to formula I in which R1 is methyl, R2 is hydrogen and n is 1.
Claim 5
Dependent Claim
21 words
A compound of claim 1 according to formula I in which R1 is hydrogen, R2 is methyl and n is 1.
Claim 6
Dependent Claim
20 words
A compound of claim 1 according to formula I in which R1 and R2 are hydrogen and n is 2.
References Cited (Backward Citations)
US3257401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |