Patent US3976658A successfully refreshed from Google Patents.
US3976658A
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Pyrazole derivatives
Assignee: Sandoz AG
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Filing: 1974-07-08
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Granted: 1976-08-24
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Expires: 1994-07-08
Abstract
Abstract New ultraviolet light-absorbing compounds of the formula IN WHICH R1 is a substituent, e.g.
Inventors
- 👤 Lajos Avar
- 👤 Kurt Hofer
- 👤 Martin Preiswerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3445; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/24; C07D231/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A compound of the formula I, ##SPC12## wherein R 1 and R 2 , independently, are C 1-4 alkyl or unsubstituted phenyl, and R is phenyl monosubstituted in the ortho- or para-position by a hydroxy group and mono- or disubstituted in the meta-position(s) by a tertiary butyl group, wherein the tertiary butyl group or at least one of the two tertiary butyl groups is adjacent to the hydroxy group, or phenyl monosubstituted by C 1-4 alkoxy.
Claim 2
Dependent Claim
76 words
A compound of the formula I, ##SPC12## wherein R 1 and R 2 , independently, are C 1-4 alkyl or unsubstituted phenyl, and R is phenyl monosubstituted in the ortho- or para-position by a hydroxy group and mono- or disubstituted in the meta-position(s) by a tertiary butyl group, wherein the tertiary butyl group or at least one of the two tertiary butyl groups is adjacent to the hydroxy group, or phenyl monosubstituted by C 1-4 alkoxy.
Claim 3
Dependent Claim
10 words
A compound according to claim 1, of the formula, ##SPC13##
Claim 4
Dependent Claim
10 words
A compound according to claim 1, of the formula, ##SPC14##
Claim 5
Dependent Claim
10 words
A compound according to claim 1, of the formula, ##SPC15##
Claim 6
Dependent Claim
10 words
A compound according to claim 1, of the formula, ##SPC16##
References Cited (Backward Citations)
US2476986A
Cited
US2476987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |