Patent US4691018A successfully refreshed from Google Patents.
US4691018A
Expired / Lapsed
US
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Pyridine derivatives and their use as anti-allergic agents
Assignee: Chugai Pharmaceutical Co Ltd
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Filing: 1986-05-06
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Granted: 1987-09-01
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Expires: 2006-05-06
Abstract
Abstract A compound of the formula ##STR1## wherein R 1 is a hydrogen atom or a lower alkyl group which may be substituted with hydroxy, lower alkyl or di-lower alkylamino; R 2 is a hydrogen atom, an amino group or a lower alkylamino group; and R 3 is a lower alkyl group, and a non-toxic salt thereof, and a process for preparing the same are disclosed. The compound and the salts thereof exhibit anti-allergic effects by the two different mechanisms and are expected to be useful as drugs for treating allergic diseases such as asthma, pollen allergy, atopic dermatitis and the like.
Inventors
- 👤 Takashi Mori
- 👤 Nobuhiro Ohi
- 👤 Yoshiyuki Ohsugi
- 👤 Yasuhiro Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:30
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/78; C07D213/81; A; A61; A61P; A61P37/00; A61P37/02; A61P37/06; A61P37/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
A compound of the formula ##STR6## wherein R 1 is a hydrogen atom or a lower alkyl group which may be substituted with hydroxy, lower alkoxy or di-lower alkylamino; R 2 is a hydrogen atom, an amino group or a lower alkylamino group; and R 3 is a lower alkyl group, and a nontoxic salt thereof.
Claim 2
Dependent Claim
56 words
A compound of the formula ##STR6## wherein R 1 is a hydrogen atom or a lower alkyl group which may be substituted with hydroxy, lower alkoxy or di-lower alkylamino; R 2 is a hydrogen atom, an amino group or a lower alkylamino group; and R 3 is a lower alkyl group, and a nontoxic salt thereof.
Claim 3
Dependent Claim
12 words
A compound of claim 1 wherein R 1 is a hydrogen atom.
Claim 4
Dependent Claim
16 words
A compound of claim 1 wherein R 1 is an alkyl group having 1-4 carbon atoms.
Claim 5
Dependent Claim
40 words
A compound of claim 1 wherein R 1 is an alkyl group having 1-4 carbon atoms and substituted with hydroxy, alkoxy having 1-4 carbon atoms or dialkylamino each of the alkyl moieties of which has 1 to 4 carbon atoms.
Claim 6
Dependent Claim
14 words
A compound in accordance with claim 1 wherein R 2 is a hydrogen atom.
Claim 7
Dependent Claim
15 words
A compound in accordance with claim 1 wherein R 2 is amino or lower alkylamino.
References Cited (Backward Citations)
JPS58105920A
Cited
JPS58159465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |