Patent US3665003A successfully refreshed from Google Patents.
US3665003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cephalosporin compounds
Assignee: Glaxo Laboratories Ltd
•
Filing: 1968-08-13
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Granted: 1972-05-23
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Expires: 1988-08-13
Abstract
Abstract 7 Beta -Acylamidoceph-3-em-4-carboxylic acids having an etherified 3-hydroxymethyl group, physiologically acceptable base or acid addition salts thereof and intermediates for the preparation of the acids and salts.
Inventors
- 👤 James Kennedy
- 👤 Alan Gibson Long
- 👤 William G E Underwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:13
CPC Classifications
C; C07; C07D; C07D409/00; C07D409/02; C07D409/04; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/54; A61K31/542; A61K31/545; C07D409/12; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/24; C07D501/26; C07D501/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
12 words
A compound as defined in claim 1 in which R1 is methyl.
Claim 2
Dependent Claim
12 words
A compound as defined in claim 1 in which Ar is phenyl.
Claim 3
Dependent Claim
18 words
A compound as defined in claim 1 in which the group at position -7 is of the D-series.
Claim 4
Dependent Claim
10 words
A compound as defined in claim 1 of the formula
Claim 5
Dependent Claim
17 words
A compound as defined in claim 1 which is 7 Beta -(D- Alpha -amino- Alpha -phenylacetamido)-3-methoxymethylceph-3-em-4-carboxylic acid.
Claim 6
Dependent Claim
17 words
A compound as defined in claim 1 which is 7 Beta -(D- Alpha -amino- Alpha -phenylacetamido)-3-ethoxymethylceph-3-em-4-carboxylic acid.
Claim 7
Dependent Claim
17 words
A compound as defined in claim 1 which is 7 Beta -(D- Alpha -amino- Alpha -phenylacetamido)-3-isopropoxymethylceph-3-em-4-carboxylic acid.
Claim 8
Dependent Claim
5 words
A compound of the formula
Claim 9
Dependent Claim
12 words
A compound as defined in claim 9 in which R1 is methyl.
Claim 10
Dependent Claim
12 words
A compound as defined in claim 10 in which R3 is methyl.
Claim 11
Dependent Claim
15 words
A compound as defined in claim 9 which is 7 Beta -(2'',2'' -dimethyl-5''-oxo-4''-phenyl-1''-imidazolidinyl)-3-methoxymethylceph-3-em-4 -carboxylic acid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |