US4046759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Penicillin esters
Assignee: Individual
•
Filing: 1975-08-25
•
Granted: 1977-09-06
•
Expires: 1995-08-25
Abstract
Abstract There disclose new penicillin esters and S-oxides thereof which are of value as intermediates for the preparation of various cephalosporin antibiotics.
Inventors
- 👤 Toshiyasu Ishimaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:15
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
28 words
A penicillin ester having the formula: ##STR9## wherein A is a conventional penicillin acylamino group; B is =S or =S--O; and R 1 is methyl, methoxy or ethoxy.
Claim 2
Dependent Claim
28 words
A penicillin ester having the formula: ##STR9## wherein A is a conventional penicillin acylamino group; B is =S or =S--O; and R 1 is methyl, methoxy or ethoxy.
Claim 3
Dependent Claim
12 words
A compound according to claim 1, in which A is phenylacetamido group.
Claim 4
Dependent Claim
12 words
A compound according to claim 1, in which A is phenoxyacetamido group.
Claim 5
Dependent Claim
12 words
2',4'-Dioxopentan-3'-yl ester of 6-phenylacetamidopenicillanic acid or its 1-oxide according to claim 1.
Claim 6
Dependent Claim
12 words
2',4'-Dioxopentan-3'-yl ester of 6-phenoxyacetamidopenicillanic acid or its 1-oxide according to claim 1.
Claim 7
Dependent Claim
12 words
1'-methoxycarbonyl-2'-oxopropan-1'-yl ester of 6-phenylacetamidopenicillanic acid or its 1-oxide according to claim 1.
Claim 8
Dependent Claim
12 words
1'-Methoxycarbonyl-2'-oxopropan-1'-yl ester of 6-phenoxyacetamidopenicillanic acid or its 1-oxide according to claim 1.
Claim 9
Dependent Claim
12 words
1'-Ethoxycarbonyl-2'-oxopropan-1'-yl ester of 6-phenylacetamidopenicillanic acid or its 1-oxide according to claim 1.
Claim 10
Dependent Claim
12 words
1'-Ethoxycarbonyl-2'-oxopropan-1'-yl ester of 6-phenoxyacetamidopenicillanic acid or its 1-oxide according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |