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US3686232A Expired / Lapsed US ⏱️ 0.0 years remaining

Anthraquinones

Assignee: Bayer AG
•
Filing: 1970-06-24
•
Granted: 1972-08-22
•
Expires: 1990-06-24
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Abstract

Abstract 1-(R1-CH(-R2)-NH-),5-(R3-O-)ANTHRAQUINONE COMPOUNDS OF FORMULA WHEREIN R4 REPRESENTS AN ALKYL GROUP WHICH IS OPTIONALLY SUBSTITUTED BY HYDROXYL OR ALKOXY GROUPS, AND R5 AND R6 REPRESENT HYDROGEN OR AN AMINO GROUP WHICH IS MONOSUBSTITUTED OR DISTUBSTITUTED BY A STRAIGHT-CHAIN ALKYL GROUP OR A CYCLOALKYL GROUP, WITH THE PROVISO THAT R5 AND R6 DO NOT SIMULTANEOUSLY REPRESENT HYDROGEN, AND PROCESSES FOR THEIR PRODUCTION. 1-(R4-O-),5-R6,8-R5-ANTHRAQUINONE WHEREIN R1 AND R2 INDEPENDENTLY OF ONE ANOTHER DENOTE OPTIONALLY SUBSTITUTED ALKYL RADICALS WITH 1-3 C ATOMS AND R3 REPRESENTS HYDROGEN OR AN OPTIONALLY SUBSTITUTED ALKYL RADICAL WITH 1-5 ATOMS, AS WELL AS COMPOUNDS OF THE FORMULA

Inventors

  • 👤 Walter Hohmann
  • 👤 Klaus Wunderlich
  • 👤 Hans-Samuel Bien

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 15:35
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/515; C09B1/02; C09B1/06; C09B1/14; C09B1/16; C09B1/20; C09B1/26; C09B1/28; C09B1/54; C09B1/545

Claims Analysis

Total Claims: 0
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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) 1975-08-22 1976-02-21 1976-08-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-22 1980-02-21 1980-08-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-22 1984-02-21 1984-08-22 $7700.00 Window Closed / Lapsed

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