Patents Assigned to GR & DC
  • Isomeric diaminobenzophenonedicarboxylic acids and method for preparing same
    Patent number: 4234743
    Abstract: 3,3'-diamino-4,4'-benzophenonedicarboxylic acid, 4,4'-diamino-3,3'-benzophenonedicarboxylic acid and 3,4'-diamino-3',4-benzophenonedicarboxylic acid and process for preparing same.
    Type: Grant
    Filed: May 17, 1979
    Date of Patent: November 18, 1980
    Assignee: GR & DC
    Inventors: Johann G. Schulz, Anatoli Onopchenko, Edward T. Sabourin