Patents by Inventor William E. Bachmann

William E. Bachmann 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).

  • Preparation of flavanthrone pigment
    Patent number: 3962251
    Abstract: A process for producing a new crystalline polymorphic form of flavanthrone is disclosed which comprises treating crude flavanthrone with nitric acid. This new form exhibits only one prominent X-ray diffraction peak between 7.00 and 8.00 dA and only two prominent peaks between 3.30 and 3.75 dA. In contrast to the known form of flavanthrone, the new form exhibits desirable transparent mass tones when employed as a pigment.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: June 8, 1976
    Assignee: Allied Chemical Corporation
    Inventors: William E. Bachmann, Thomas R. Flatt