Patents by Inventor Michael John Lemmons

Michael John Lemmons 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).

  • Perylene pigment composition and process therefor
    Patent number: 6997983
    Abstract: A process for the manufacture of a pigments form of perylene-3,4,9,10-tetracarboxylic acid N,N?-bis-methylimide having a transparent clean yellowish shade, comprises comminution of a mixture comprising perylene-3,4,9,10-tetracarboxylic acid N,N?-bis-methylimide produced by methylation of perylenetetracarboxylic imide with an alkylating agent and perylene-3,4,9,10-tetracarboxylic acid N,N?-bis-methylimide produced by the condensation of perylenetetracarboxylic anhydride with methylamine, in the presence of dimerized rosin. The pigments obtainable are notable for their outstanding coloristic and rheological properties and are suitable for use in a variety of applications.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: February 14, 2006
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Terence Richard Chamberlain, Donald Thomas DeRussy, Michael John Lemmons