US3352859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving crystal quality of a cephalosporin antibiotic
Assignee: Eli Lilly and Co
•
Filing: 1967-03-24
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Granted: 1967-11-14
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Expires: 1987-03-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Harvey M Higgins
- 👤 Edwin O Davisson
- 👤 Carver Diane Deberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:24
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/24; C07D501/38; C07D501/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A METHOD WHICH COMPRISES ADDING ACETONE TO A SOLUTION OF CEPHALORIDINE IN A WATER/ACETONE MIXTURE CONTAINING AT LEAST 20 PERCENT ACETONE BY VOLUME IN THE PRESENCE OF MINOR PROPORTIONS OF (A) METHYL ISOBUTYL KETONE AND (B) METHYLENE DICHLORIDE, CHLOROFORM, OR MIXTURES THEREOF TO CRYSTALLIZE CEPHALORIDINE FORM SUCH SOLUTION.
Claim 2
Independent Claim
48 words
A METHOD WHICH COMPRISES ADDING ACETONE TO A SOLUTION OF CEPHALORIDINE IN A WATER/ACETONE MIXTURE CONTAINING AT LEAST 20 PERCENT ACETONE BY VOLUME IN THE PRESENCE OF MINOR PROPORTIONS OF (A) METHYL ISOBUTYL KETONE AND (B) METHYLENE DICHLORIDE, CHLOROFORM, OR MIXTURES THEREOF TO CRYSTALLIZE CEPHALORIDINE FORM SUCH SOLUTION.
References Cited (Backward Citations)
US3270012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |