Patents by Inventor James E. Rak

James E. Rak 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).

  • Inverse emulsion polymer and production thereof
    Patent number: 6414080
    Abstract: Disclosed herein is an inverse emulsion polymer composition comprising a copolymer or copolymer salt of N,N,-dimethylacrylamide and 2-acrylamido-2-methylpropane sulfonic acid or acid salts thereof, having a Brookfield viscosity of less than 20,000 Cps at 23° C. and an active polymer concentration of about 25 to about 75 weight percent. The inverse emulsion polymer composition is in a hydrocarbon with a primary surfactant and optionally contains water.
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: July 2, 2002
    Assignee: Calgon Corporation
    Inventors: Randy J. Loeffler, Shih-Ruey T. Chen, Kevin W. Frederick, James E. Rak