Patent US3183841A successfully refreshed from Google Patents.
Patent US3862182A successfully refreshed from Google Patents.
US3862182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process to prepare novel antibiotic intermediates
Assignee: Merck and Co Inc
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Filing: 1972-10-11
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Granted: 1975-01-21
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Expires: 1992-10-11
Abstract
Abstract Compounds including 7-hydroxymethyl cephalosporanic acid and derivatives of the 7-hydroxymethyl group are disclosed. In addition, processes are disclosed which yield 7-hydroxymethyl cephalosporanic acid and which further yield valuable derivatives of the 7-hydroxymethyl group. This invention also relates to 6hydroxymethyl penicillanic acid and analogous derivatives of penicillin.
Inventors
- 👤 David B R Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:27
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
The process of claim 1 in which (Z) is
Claim 2
Dependent Claim
12 words
The process of claim 2 in which A is loweralkanoyloxy or carbamoyloxy.
Claim 3
Dependent Claim
10 words
The process of claim 3 in which A is acetoxy.
Claim 4
Dependent Claim
10 words
The process of claim 3 in which A is carbamoyloxy.
References Cited (Backward Citations)
US2698347A
Cited
US3641098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |