Patents by Inventor Peter P. Wenzl

Peter P. Wenzl 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).

  • Thermally-responsive record material
    Patent number: 6294502
    Abstract: The invention discloses a novel thermally-responsive record material comprising a support having coated thereon a thermally sensitive color forming composition comprising a chromogenic material, an acidic developer material and a certain carbamate component that does not include dodecyl-N-phenylcarbamate. The novel record material displays enhanced image intensity or improved thermal response.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: September 25, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Mark Robert Fisher, John Charles DeBraal, Guido Steffan, Peter P. Wenzl
  • Thermally-responsive record material
    Patent number: 6015771
    Abstract: The present invention discloses a novel thermally-responsive record material having coated thereon a thermally sensitive color forming composition comprising a chromogenic material, an acidic developer material and a carbamate of the formula ##STR1## wherein R is selected from alkyl, aryl or aralkyl. The alkyl moiety in each of the preceding is selected to be of from one to eight carbons. The novel record material displays enhanced image intensity or improved thermal response.
    Type: Grant
    Filed: May 22, 1998
    Date of Patent: January 18, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Mark Robert Fisher, John Charles DeBraal, Guido Steffan, Peter P. Wenzl