Patents by Inventor Claes F. H. Pfeiffer

Claes F. H. Pfeiffer 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).

  • Sealing compositions
    Patent number: 4699810
    Abstract: A storage-stable container sealing composition which is fluid and comprises an aqueous dispersion of a visco elastic, generally elastomeric, polymer and hollow microspheres of a thermoplastic polymeric material containing a liquid blowing agent. The compositions are applied as gaskets to container closures and are heated to volatilize the blowing agent and expand the microspheres.
    Type: Grant
    Filed: February 5, 1987
    Date of Patent: October 13, 1987
    Assignee: W. R. Grace & Co.
    Inventors: Peter J. Blakeman, Terence R. Johnson, Claes F. H. Pfeiffer