Patent US4487929A successfully refreshed from Google Patents.
US4487929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermediates for pyrazolopyridazine derivatives
Assignee: Hoffmann La Roche Inc
•
Filing: 1983-04-25
•
Granted: 1984-12-11
•
Expires: 2003-04-25
Abstract
Abstract Intermediates of the formula <IMAGE> wherein A is methylene, ethylene or propylene which may be substituted by lower alkyl, Y is halogen, R3 is hydrogen, lower alkyl, aryl or aryl-(lower alkyl)-, R20 l is lower alkoxy and R42 is hydrogen, lower alkyl, aryl or aryl-(lower alkyl) or a group of the formula -A-Y in which A and Y are as above, are described.
Inventors
- 👤 Cedric H. Hassall
- 👤 Geoffrey Lawton
- 👤 Christopher J. Moody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:19
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; C07D237/00; C07D237/02; C07D237/04; C07D491/00; C07D491/12; C07D491/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A compound of the formula ##STR18## wherein A is methylene, ethylene or propylene which may be substituted by lower alkyl, Y is halogen, R 3 is hydrogen, lower alkyl, benzyl, phenyl or phenyl bearing one or more substituents selected from the group consisting of halogen, lower alkyl, lower alkoxy and trifluoromethyl, R 20 is lower alkoxy and R 42 is hydrogen, lower alkyl, benzyl, phenyl, phenyl bearing one or more substituents selected from the group consisting of halogen, lower alkyl, lower alkoxy and trifluoromethyl or a group of the formula --A--Y in which A and Y are as described above.
Claim 2
Dependent Claim
100 words
A compound of the formula ##STR18## wherein A is methylene, ethylene or propylene which may be substituted by lower alkyl, Y is halogen, R 3 is hydrogen, lower alkyl, benzyl, phenyl or phenyl bearing one or more substituents selected from the group consisting of halogen, lower alkyl, lower alkoxy and trifluoromethyl, R 20 is lower alkoxy and R 42 is hydrogen, lower alkyl, benzyl, phenyl, phenyl bearing one or more substituents selected from the group consisting of halogen, lower alkyl, lower alkoxy and trifluoromethyl or a group of the formula --A--Y in which A and Y are as described above.
References Cited (Backward Citations)
US4307094A
Cited
US4341781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |