US4476298A
Expired / Lapsed
US
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Erythromycin A derivatives
Assignee: Taisho Pharmaceutical Co Ltd
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Filing: 1982-11-24
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Granted: 1984-10-09
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Expires: 2002-11-24
Abstract
Abstract Novel erythromycin A derivatives of the formula <IMAGE> wherein R is hydrogen or methyl, and the pharmaceutically acceptable acid addition salts thereof are disclosed. They exhibit excellent antibacterial activity against erythromycin resistant bacteria, Gram-positive bacteria and Mycoplasma species.
Inventors
- 👤 Shigeo Morimoto
- 👤 Yoko Takahashi
- 👤 Yoshiaki Watanabe
- 👤 Sadafumi Omura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:35
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08; A; A61; A61P; A61P31/00; A61P31/04; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
An erythromycin A derivative of the formula ##STR5## wherein R is hydrogen or methyl, and the pharmaceutically acceptable acid addition salts thereof.
Claim 2
Dependent Claim
22 words
An erythromycin A derivative of the formula ##STR5## wherein R is hydrogen or methyl, and the pharmaceutically acceptable acid addition salts thereof.
Claim 3
Dependent Claim
10 words
A compound according to claim 1 wherein R is hydrogen.
Claim 4
Dependent Claim
10 words
A compound according to claim 1 wherein R is methyl.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |