Patents by Inventor Allen W. Carlson

Allen W. Carlson 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).

  • Patent number: 5843524
    Abstract: The present invention provides a new and improved method of producing a dustless vinyl halide polymer color concentrate that does not require the formation of a hot melt or the use of wax. The color concentrate comprises a multitude of fine particles which each comprise a vinyl halide polymer resin core and a colorant material shell. The method includes the steps of providing a vinyl halide polymer, providing a colorant material, providing a compatibilizer having a solubility parameter of from about 7 to about 12 (cal/ml).sup.1/2, and mixing the vinyl halide polymer, compatibilizer and colorant material together to yield the dustless concentrate in the form of a vinyl halide resin core surrounded by a shell of the compatibilzer and the colorant material.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: December 1, 1998
    Assignee: Ferro Corporation
    Inventors: Surachai Wimolkiatisak, Dennis L. Hammond, Anthony S. Scheibelhoffer, Allen W. Carlson, Mir L. Ali