Patents by Inventor Petrus Johannes Maria Derks

Petrus Johannes Maria Derks 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).

  • Azine-containing photoconductive element
    Patent number: 5952142
    Abstract: A photoconductive element containing a transport substance and an azine, wherein the azine is a transport substance having the molecular formula: ##STR1## wherein R.sub.1 -R.sub.6 can be different or the same constituents, and are hydrogen or C.sub.1 -C.sub.4 alkyl groups. The transport substance is preferably a tri-aryl amine or a substituted stilbene compound. These photoconductive elements reduce the deterioration of the photoelectrical properties.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: September 14, 1999
    Assignee: Oce-Technologies, B.V.
    Inventors: Petrus Johannes Maria Derks, Achilles Wilhelmus Maria Persoon, Maria Petronella Henrica van Horck