Patent US4377524A successfully refreshed from Google Patents.
US4377524A
Expired / Lapsed
US
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Bis-esters of methanediol with penicillins and penicillanic acid 1,1-dioxide
Assignee: Pfizer Inc
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Filing: 1980-09-08
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Granted: 1983-03-22
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Expires: 2000-09-08
Abstract
Abstract 6'-Acylaminopenicillanoyloxymethyl esters of penicillanic acid 1,1-dioxide are useful as antibacterial agents. The 6'-aminopenicillanoyloxymethyl ester, halomethyl esters, alkylsulfonyloxymethyl esters and arylsulfonyloxymethyl esters of penicillanic acid 1,1-dioxide are all useful intermediates for the aforesaid antibacterial agents.
Inventors
- 👤 Eric C. Bigham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:49
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
11 words
The compound of the formula ##STR11## and the acid-addition salts thereof.
Claim 2
Dependent Claim
11 words
The compound of the formula ##STR11## and the acid-addition salts thereof.
Claim 3
Dependent Claim
28 words
A compound of the formula ##STR12## wherein X is selected from the group consisting of chloro, bromo, iodo, alkylsulfonyloxy having from one to four carbons, benzenesulfonyloxy and toluenesulfonyloxy.
Claim 4
Dependent Claim
28 words
A compound of the formula ##STR12## wherein X is selected from the group consisting of chloro, bromo, iodo, alkylsulfonyloxy having from one to four carbons, benzenesulfonyloxy and toluenesulfonyloxy.
Claim 5
Dependent Claim
10 words
The compound according to claim 2, wherein X is chloro.
References Cited (Backward Citations)
US3850908A
Cited
GB1303491A
Cited
US3869449A
Cited
US3838152A
Cited
US4051126A
Cited
US3981865A
Cited
DE2713683A1
Cited
DE2824535C3
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |