Patent US4021479A successfully refreshed from Google Patents.
US4021479A
Expired / Lapsed
US
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Derivatives of 4-(4-biphenylyl)-butyric acid
Assignee: Boehringer Ingelheim GmbH
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Filing: 1973-10-15
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Granted: 1977-05-03
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Expires: 1993-10-15
Abstract
Abstract Compounds of the formulas <IMAGE> and <IMAGE> wherein A is -CH2- or -CH(OH)-, R1 is hydrogen, halogen or, when R2 and R3 are other than both hydrogen, also methyl, R2 is hydrogen, halogen, cyano, nitro, amino or (alkanoyl of 1 to 4 carbon atoms)-amino, R3 is hydrogen or halogen, PROVIDED, HOWEVER, THAT AT LEAST ONE OF R1, R2 and R3 is other than hydrogen, and R4 is hydrogen or alkyl of 1 to 4 carbon atoms, and non-toxic salts of the free acids (R4 = H) formed with inorganic or organic bases; the compounds as well as their salts are useful as antiphlogistics and antiproliferatives.
Inventors
- 👤 Ernst Seeger
- 👤 Wolfhard Engel
- 👤 Josef Nickl
- 👤 Helmut Teufel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:29
CPC Classifications
C; C07; C07C; C07C205/00; C07C205/49; C07C205/56; C07C57/00; C07C57/52; C07C57/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
4-(2'-fluoro-4-biphenylyl)-4-hydroxy-butyric acid or a non-toxic salt thereof formed with an inorganic or organic base.
Claim 2
Dependent Claim
14 words
4-(2'-fluoro-4-biphenylyl)-4-hydroxy-butyric acid or a non-toxic salt thereof formed with an inorganic or organic base.
References Cited (Backward Citations)
US3462483A
Cited
US3867434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |