US4575497A
Expired / Lapsed
US
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3, 3", 4"-Tri-O-acylspiramycin I
Assignee: KH Neochem Co Ltd
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Filing: 1984-12-11
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Granted: 1986-03-11
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Expires: 2004-12-11
Abstract
Abstract 3, 3'', 4''-Tri-O-acylspiramycin I represented by the formula: <IMAGE> wherein R1, R2 and R3 are the same or different groups, and at least one of the groups is a straight or branched chain alkylcarbonyl group represented by -COCmH2m+1 wherein m is an integer of 2-4 and the other group(s) are straight or branched chain alkylcarbonyl group(s) represented by -COCnH2n+1 wherein n is an integer of 1-4, and its pharmacologically acceptable acid addition salts.
Inventors
- 👤 Satoshi Omura
- 👤 Hiroshi Sano
- 👤 Kinya Yamashita
- 👤 Ryo Okachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:13
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08; A; A61; A61P; A61P31/00; A61P31/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
3,3", 4"-Tri-O-acylspiramycin I represented by the formula: ##STR13## wherein R 1 , R 2 and R 3 have the meanings represented by one combination selected from the following (1) to (4) combinations: ______________________________________
R.sub.1 R.sub.2 R.sub.3
______________________________________
(1) propionyl propionyl propionyl
(2) butyryl acetyl acetyl
(3) acetyl propionyl propionyl
(4) propionyl butyryl propionyl.
______________________________________
Claim 2
Dependent Claim
54 words
3,3", 4"-Tri-O-acylspiramycin I represented by the formula: ##STR13## wherein R 1 , R 2 and R 3 have the meanings represented by one combination selected from the following (1) to (4) combinations: ______________________________________
R.sub.1 R.sub.2 R.sub.3
______________________________________
(1) propionyl propionyl propionyl
(2) butyryl acetyl acetyl
(3) acetyl propionyl propionyl
(4) propionyl butyryl propionyl.
______________________________________
References Cited (Backward Citations)
US4242504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |