US3049541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformation of cephalosporin c
Assignee: National Research Development Corp UK
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Filing: 1959-03-12
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Granted: 1962-08-14
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Expires: 1979-03-12
Abstract
No abstract record available.
Inventors
- 👤 Abraham Edward Penley
- 👤 Newton Guy Geoffrey Frederick
- 👤 Hale Clifford William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:15
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/02; C07D501/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
THE PRODUCT PRODUCED BY SUBJECTING AN AQUEOUS SOLUTION OF CEPHALOSPORIN C TO THE ACTION OF HYDROCHLORIC ACID OF A NORMALLY OF FROM 0.1 TO 1 N FOR A PROLONGED PERIOD OF TIME OF ABOUT 1 TO 6 DAYS, SAID PRODUCT BEING A TRANSFORMATION PRODUCT OF THE CEPHALOSPORIN C DESIGNATED AS CEPHALOSPORIN CC AND HAVING A GREATER ACTIVITY AGAINST STAPH. AUREUS THAN AGAINST SALM. TYPHI AND SHOWING MAXIMUM ABSORPTION IN AN ULTRA-VIOLET ABSORPTION SPECTRUM AT 225 MU AND SEPARATING THE CEPHALOSPORING CC THUS PRODUCED FROM COPRESENT CEPHALOSPORIN C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |