Patent US3708540A successfully refreshed from Google Patents.
US3708540A
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US
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Pentanedione derivatives
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1970-07-21
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Granted: 1973-01-02
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Expires: 1990-07-21
Abstract
Abstract Compounds of the formula WHEREIN R is a hydrogen atom or an alkyl having one to five carbon atoms and n is an integer of 1 to 3, are produced by subjecting a compound of the formula WHEREIN R an n have the same meaning as above, to hydrogenation. The compounds are cholagogue agents.
Inventors
- 👤 H Yokotani
- 👤 M Miyamoto
- 👤 T Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:14
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/12; A61P; A61P1/00; A61P1/16; C; C07; C07C; C07C45/00; C07C45/61; C07C45/62; C07C49/00; C07C49/20; C07C49/24; C07C49/245; C07C49/255
Claims Analysis
Total Claims: 0
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |