Patents by Inventor Dennis J. Karcher

Dennis J. Karcher 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).

  • Tertiaryaminoalkyl-hydroxyalkyl ethers of polygalactomannans
    Patent number: 4918181
    Abstract: Dialkylaminoalkyl-hydroxyalkyl ethers of polygalactomannan are useful as thickening agents for aqueous fluids.
    Type: Grant
    Filed: March 2, 1988
    Date of Patent: April 17, 1990
    Inventors: Dennis J. Karcher, Michael E. Morgan, Martha A. Phelps