Patent US3239394A successfully refreshed from Google Patents.
US3239394A
Expired / Lapsed
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⏱️ 0.0 years remaining
Process for producing 7-amino-cephalosporanic acid
Assignee: Merck and Co Inc
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Filing: 1964-06-15
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Granted: 1966-03-08
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Robert B Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:00
CPC Classifications
C; C12; C12P; C12P35/00; C12P35/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PROCESS FOR PRODUCING 7-AMINOCEPHALOSPORANIC ACID WHICH COMPRISES INTIMATELY CONTACTING A CEPHALOSPORIN FRO THE GROUP CONSISTING OF CEPHALOSPORIN C AND SALTS THEREOF IN AN AQUEOUS MEDIUM WITH ENZYMES PRODUCED BY A CEPHALOSPORIN AMIDASE-PRODUCING STRAIN OF A MICROORGANISM SELECTED FROM THE GENERA CONSISTING OF BREVIBACTERIUM, ARCHOMOBACTERIUM AND FLAVOBACTERIUM.
Claim 2
Dependent Claim
47 words
A PROCESS FOR PRODUCING 7-AMINOCEPHALOSPORANIC ACID WHICH COMPRISES INTIMATELY CONTACTING A CEPHALOSPORIN FRO THE GROUP CONSISTING OF CEPHALOSPORIN C AND SALTS THEREOF IN AN AQUEOUS MEDIUM WITH ENZYMES PRODUCED BY A CEPHALOSPORIN AMIDASE-PRODUCING STRAIN OF A MICROORGANISM SELECTED FROM THE GENERA CONSISTING OF BREVIBACTERIUM, ARCHOMOBACTERIUM AND FLAVOBACTERIUM.
References Cited (Backward Citations)
US3014845A
Cited
US3082155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |