US3697547A
Expired / Lapsed
US
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Erythronolide b derivatives
Assignee: Abbott Laboratories
•
Filing: 1970-12-18
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Granted: 1972-10-10
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Expires: 1990-12-18
Abstract
Abstract 8,9-Anhydroerythronolide B 6,9-hemiketal and 8hydroxyerythronolide B are respectively successive intermediates for the preparation of 3-mycarosyl-8-hydroxyerythronolide B which is useful as an antipyretic.
Inventors
- 👤 Paul Kurath
- 👤 Richard Stephan Egan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:42
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08; C07D; C07D313/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
The compound according to claim 1 in which R2 and R3 are hydroxy and R1 is oxo, namely 8-hydroxyerythronolide B.
Claim 2
Dependent Claim
31 words
A compound according to claim 1 in which R1 and R2 form a double bond between the 8,9-position and R3 forms an oxygen bridge between the 6,9-positions, namely, 8,9-anhydroerythronolide B 6,9-hemiketal.
References Cited (Backward Citations)
US3366647A
Cited
US3415848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |