US3700681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-hydroxymethyl-3-hydroxy-6-(1-hydroxy-2-aminoethyl)pyridines
Assignee: Pfizer Inc
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Filing: 1971-02-16
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Granted: 1972-10-24
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Expires: 1991-02-16
Abstract
Abstract 2-Hydroxymethyl-3-hydroxy-6-(1-hydroxy-2-aminoethyl)-pyridines and salts thereof, a novel class of Beta -adrenergic agonist bronchodilators in mammals, and 2-hydroxymethyl-3-benzyloxy-6pyridinecarboxaldehyde a valuable intermediate in the preparation of the subject compounds.
Inventors
- 👤 Wayne E Barth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:24
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; C07C; C07C251/00; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/63; C07D213/65; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07D317/48; C07D317/50; C07D317/58; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
16 words
The compound of claim 1 wherein R1 is alkyl containing from one to five carbon atoms.
Claim 2
Dependent Claim
9 words
The compound of claim 2 wherein R1 is iso-propyl.
Claim 3
Dependent Claim
9 words
The compound of claim 2 wherein R1 is tert-butyl.
Claim 4
Dependent Claim
20 words
The compound of claim 1 wherein R1 is substituted phenylalkyl wherein said alkyl contains from three to five carbon atoms.
Claim 5
Dependent Claim
12 words
The compound of claim 5 wherein R1 is 3-(4''-methoxyphenyl)-1-methylpropyl of the formula:
Claim 6
Dependent Claim
12 words
The compound of claim 5 wherein R1 is 3-(4''-hydroxyphenyl)-1-methylpropyl of the formula:
Claim 7
Dependent Claim
12 words
The compound of claim 5 wherein R1 is 2-(4''-methoxyphenyl)1-methylethyl of the formula:
Claim 8
Dependent Claim
12 words
The compound of claim 5 wherein R1 is 2-(4''-hydroxyphenyl)-1-methylethyl of the formula:
References Cited (Backward Citations)
US3433796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |