Patent US3884904A successfully refreshed from Google Patents.
US3884904A
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11-Substituted erythromycin B derivatives
Assignee: Abbott Laboratories
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Filing: 1973-06-21
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Granted: 1975-05-20
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Expires: 1993-06-21
Abstract
Abstract Covers 11-substituted erythromycin B derivatives having a formula selected from the group consisting of: WHERE R is selected from the group consisting of lower alkyl and -CHR3SR4 where R3 and R4 are loweralkyl, and R1 and R2 are hydrogen or loweralkyl and; WHERE R1, R2 and R3 are as before defined. Said erythromycin derivatives are useful as antibiotics or as intermediates useful in preparing other useful antibiotic compounds.
Inventors
- 👤 Peter Hadley Jones
- 👤 James Bruce Mcalpine
- 👤 Jeanne Marie Pauvlik
- 👤 Thomas John Perun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:57
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
AN 11-SUBSTITUTED ERYTHROMYCIN B DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Dependent Claim
11 words
AN 11-SUBSTITUTED ERYTHROMYCIN B DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF:
Claim 3
Dependent Claim
18 words
The derivative of claim 1 wherein R is methyl, and R1 and R2 are hydrogen in Formula I.
Claim 4
Dependent Claim
8 words
The derivative of claim 1 wherein R1 is
Claim 5
Dependent Claim
14 words
The derivative of claim 1 wherein R1 and R2 are hydrogen in Formula I.
Claim 6
Dependent Claim
15 words
The derivative of claim 1 where R1, R2 and R3 are hydrogen in Formula II.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |