Patents by Inventor Petrus A. M. R. Simons

Petrus A. M. R. Simons 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).

  • Copying process and electrophotographic element utilizing a photoconductive pigment dispersed in an improved polymeric binder
    Patent number: 4640879
    Abstract: An electrophotographic element and an indirect electrophotographic process for producing copies are described wherein the electrophotographic element contains a photoconductive pigment dispersed in a binder, the binder being a copolymer of an acrylic or methacrylic acid ester monomer, a vinyl aryl monomer, and 1% to 3% by weight unsaturated acid, such that 2.5 to 6.0 parts by weight of copolymerized vinyl aryl monomer are present per part by weight of copolymerized acrylic or methacrylic acid ester monomer. After repeated use of this electrophotographic element, the contours of smaller sized images do not become visible on larger sized images produced after the smaller images.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: February 3, 1987
    Assignee: Oce-Nederland B.V.
    Inventors: Petrus A. M. R. Simons, Wilhelmus J. Bouts