US3573287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted p-hydroxyphenyl-hydrazones and process for their manufacture
Assignee: Hoechst AG
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Filing: 1968-08-07
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Granted: 1971-03-30
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Expires: 1988-08-07
Abstract
Abstract SUBSTITUTED P-HYDROXYPHENYL-HYDRAZONES OF THE FORMULA 1-R4,3-((4-(HO-),R1,R2-PHENYL)-NH-N=C(-R3)-)PYRIDINIUM X(-) IN WHICH R1 AND R2 REPRESENT HYDROGEN, HALOGEN, LOWER ALKYL OR ALKOXY, CARBOXY, CARBAMOYL, LOWER CARBALKOXY, CARBOBENZOXY, SULFOXY OR SULFAMOUL; R3 REPRESNETS HYDROGEN OR LOWER ALKYL HAVING 1 TO 3 CARBON ATOMS, R4 REPRESENTS AN ALKYL RADICAL HAVING 1 TO 12 CARBON ATOMS, WHICH MAY CARRY ONE OR SEVERAL HYDROXY, LOWER ALKOXY, CARBOXY, LOWER CARBALKOXY, CARBAMOYL, NITRILE, SULFO, LOWER SULFALKOXY AND/OR SULFAMOYL GROUPS, AND X REPRESENTS THE ANION OF A NON-TOXIC ACID, WHICH COMPOUNDS HAVE BACTERIOSTATIC PROPERTIES.
Inventors
- 👤 Manfred Schorr
- 👤 Elmar Schrinner
- 👤 Karl Horst Teichmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:29
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/435; A61K31/44; C; C09; C09B; C09B26/00; C09B26/02; C09B26/04; Y; Y02; Y02A; Y02A50/00; Y02A50/30
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |