Patent US3915951A successfully refreshed from Google Patents.
US3915951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4(3-Carboxy-4-hydroxyphenylazo)-benzenlsulphonamide pyridine compounds having immunosuppressive effects
Assignee: Pfizer Health AB
•
Filing: 1972-11-20
•
Granted: 1975-10-28
•
Expires: 1992-11-20
Abstract
Abstract The compound: where A is either (1) WHERE R1; R2 and R3 are either hydrogen, lower alkyl, halogen, lower alkoxy, cyano, nitro or carboxamide and R4 is either lower alkyl, halogen, lower alkoxy, cyano, nitro or carboxamide, or (2) where R1''; R2''; R3'' and R4'' are either hydrogen, lower alkyl, halogen, lower alkoxy, cyano, nitro or carboxamido. These compounds are useful in immunosuppressives especially in skin transplants.
Inventors
- 👤 Karl Hubert Agback
- 👤 Ragnvald Erik Lindblom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:16
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/76; C09; C09B; C09B43/00; C09B43/06; C09B43/30; C09B43/32; C09B43/325
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
6 words
A 4-(3-CARBOXY-4-HYDROXY-PHENYLAZO)-BENZENESULPHONAMIDE PYRIDINE OF THE FORMULA
Claim 2
Dependent Claim
6 words
A 4-(3-CARBOXY-4-HYDROXY-PHENYLAZO)-BENZENESULPHONAMIDE PYRIDINE OF THE FORMULA
Claim 3
Dependent Claim
15 words
A compound as claimed in claim 1 in the form of its pharmaceutically acceptable salt.
Claim 4
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-methyl-pyridine.
Claim 5
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-methyl-pyridine.
Claim 6
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-4-methyl-pyridine.
Claim 7
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-4-methyl-pyridine.
Claim 8
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-5-methyl-pyridine.
Claim 9
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-5-methyl-pyridine.
Claim 10
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-6-methyl-pyridine.
Claim 11
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-6-methyl-pyridine.
Claim 12
Dependent Claim
3 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-4, 6-dimethyl-pyridine.
Claim 13
Dependent Claim
3 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-4, 6-dimethyl-pyridine.
Claim 14
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-5-chloro-pyridine.
Claim 15
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-5-chloro-pyridine.
Claim 16
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-ethyl-pyridine.
Claim 17
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-ethyl-pyridine.
Claim 18
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-ethoxy-pyridine.
Claim 19
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-ethoxy-pyridine.
Claim 20
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-chloro-pyridine.
Claim 21
Dependent Claim
2 words
2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-3-chloro-pyridine.
Claim 22
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-2,6-dimethyl-pyridine.
Claim 23
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-2,6-dimethyl-pyridine.
Claim 24
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-2-chloro-pyridine.
Claim 25
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-2-chloro-pyridine.
Claim 26
Dependent Claim
2 words
5-bromo-2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzenesulphonamido)-6-methyl -pyridine.
Claim 27
Dependent Claim
2 words
5-bromo-2-(4-(3-carboxy-4-hydroxy-phenylazo)-benzenesulphonamido)-6-methyl -pyridine.
Claim 28
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-pyridine.
Claim 29
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-pyridine.
Claim 30
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-6-methoxy-pyridine.
Claim 31
Dependent Claim
2 words
3-(4-(3-carboxy-4-hydroxy-phenylazo)-benzene sulphonamido)-6-methoxy-pyridine.
References Cited (Backward Citations)
US2396145A
Cited
US3681319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |