US4488994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis-esters of methanediol with penicillins and penicillanic acid 1,1-dioxide
Assignee: Pfizer Inc
•
Filing: 1982-02-16
•
Granted: 1984-12-18
•
Expires: 2002-02-16
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
2026-10-23 14:27
CPC Classifications
C; C07; C07D; C07D499/00; C07D499/21; C07D499/28; C07D499/32; Y; Y02; Y02A; Y02A50/00; Y02A50/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
The 4-toluenesulfonate salt of 6'-(2-amino-2-phenylacetamido)penicillanoyloxymethyl penicillanate 1,1-dioxide.
Claim 2
Dependent Claim
7 words
The 4-toluenesulfonate salt of 6'-(2-amino-2-phenylacetamido)penicillanoyloxymethyl penicillanate 1,1-dioxide.
References Cited (Backward Citations)
US3850908A
Cited
GB1303491A
Cited
US3869449A
Cited
US3838152A
Cited
US4051126A
Cited
US3981865A
Cited
DE2713683A1
Cited
DE2824535A1
Cited
US4234579A
Cited
GB2044255A
Cited
US4244951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |