Patent US3674773A successfully refreshed from Google Patents.
US3674773A
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Erythromycin derivatives
Assignee: Abbott Laboratories
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Filing: 1970-10-06
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Granted: 1972-07-04
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Expires: 1990-10-06
Abstract
Abstract The 8,9-anhydro-8,9-epoxyerythromycin 6,9-hemiketal, the 8,9seco-8-oxoerythromycin-9-oic acid 6,9-lactone, and the 8hydroxyerythromycin derivatives of both erythromycin A and B have antimicrobial activity, and the N-oxide intermediates thereof.
Inventors
- 👤 Paul Kurath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:14
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A compound according to claim 1 in which R4 is hydroxy, R2 is oxo, R3 is hydroxy, and n is 0, namely 8-hydroxyerythromycin.
Claim 2
Dependent Claim
30 words
A compound according to claim 1 in which R4 is an oxygen bridge between the 6,9-positions, R2 and R3 are each oxo, and n is 0, namely, 8,9-seco-8-oxoerythromycin-9-oic acid 6,9-lactone.
Claim 3
Dependent Claim
42 words
A compound according to claim 1 in which R4 is an oxygen bridge between the 6,9-positions, R2 and R3 are joined together to form an epoxy linkage between the vicinal carbon atoms of the 8,9-positions, and n is 0, namely 8,9-anhydro-8,9-epoxyerythromycin 6,9-hemiketal.
Claim 4
Dependent Claim
11 words
A compound according to claim 1 in which n is 1.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |