Patents by Inventor Walter Schlesinger

Walter Schlesinger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the preparation of 1,4-benzo-diazepines and 1,4-benzodiazepinones
    Patent number: 4155904
    Abstract: This invention relates to an improved process for the preparation of 1,3-dihydro-2H-1,4-benzodiazepin-2-ones and 2,3-dihydro-1H-1,4-benzodiazepines by the condensation of a 2-(2-haloacylamido)-benzophenone or a 2-(2-haloethylamino)-benzophenone, respectively, in the presence of hexamethylenetetramine, a water miscible alcohol containing 5 to 50 volume percent water, and an ammonium salt.
    Type: Grant
    Filed: July 23, 1976
    Date of Patent: May 22, 1979
    Assignee: Schering Corporation
    Inventor: Walter Schlesinger