Patents by Inventor Peter Ritschel

Peter Ritschel 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).

  • Method and apparatus for providing foaming thermoplastic compositions
    Patent number: 4549915
    Abstract: Method and apparatus for providing a foamed mass of thermoplastic, e.g., a hot melt adhesive on a substrate by introducing a foaming agent to the composition which has been melted by heating in excess of 100.degree. C. The foaming agent is provided by water entrained in a carrier gas and is preferably introduced to the thermoplastic as it is dispensed from an applicator. The invention permits foaming of adhesives using readily available raw materials and simple equipment readily derivable from existing hot melt adhesive applicators.
    Type: Grant
    Filed: January 11, 1984
    Date of Patent: October 29, 1985
    Assignee: USM Corporation
    Inventors: Peter Ritschel, Herbert Freudenreich, Waldemar Hartmann