Patent US3676434A successfully refreshed from Google Patents.
US3676434A
Expired / Lapsed
US
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Cephalosporin salts
Assignee: Eli Lilly and Co
•
Filing: 1970-07-29
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Granted: 1972-07-11
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Expires: 1990-07-29
Abstract
Abstract New and improved salts of cephalexin with anthraquinone-1,5disulfonic acid, anthraquinone-2-sulfonic acid and 1-naphthol-5sulfonic acid having solubilities in water less than 10 milligrams per milliliter.
Inventors
- 👤 E H Massey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:31
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/22; A; A61; A61B; A61B6/00; A61B6/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
13 words
A salt as defined in claim 1 wherein said acid is anthraquinone-2-sulfonic acid.
Claim 2
Dependent Claim
13 words
A salt as defined in claim 1 wherein said acid is 1-naphthol-5-sulfonic acid.
Claim 3
Dependent Claim
4 words
Di( 7-(D-2''-phenyl-2''-aminoacetamido)-desacetoxycephalosporanic acid) anthraquinone-1,5-disulfonate.
References Cited (Backward Citations)
US3278525A
Cited
US3507861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |