US3755372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isoflavanoid ethers
Assignee: Merck Patent GmbH
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Filing: 1971-02-11
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Granted: 1973-08-28
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Expires: 1991-02-11
Abstract
Abstract ISOFLAVANOID ETHERS OF THE FORMULA 2-R3,3-(4-(R2-O-)PHENYL),4-R4,7-(R1-O-)-2H-CHROMENE WHEREIN R1 AND R2, WHICH CAN BE IDENTICAL OR DIFFERENT, ARE ISOPROPYL, TERT.-BUTYL, CYCLOPENTYL, OR CYCLOHEXYL, R3 AND R4, WHICH CAN BE IDENTICAL OR DIFFERENT, ARE ALKY OF 1-4 CARBON ATOMS, POSSESS VALUABLE PHARMACOLOGICAL ACTIVITY, INCLUDING ESTROGENIC, GONADOTROPIN-INHIBITING AND ANTI-FERTILITY ACTIVITY. THEY ARE USEFUL AS FEED SUPPLEMENTS FOR CATTLE AND POULTRY TO PROMOTE GROWTH AND WEIGHT GAIN.
Inventors
- 👤 K Irmscher
- 👤 J Kramer
- 👤 H Kraft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:09
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |