Patents by Inventor Philip C. Schoonover

Philip C. Schoonover 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).

  • Patent number: 4015983
    Abstract: A fracturable manifold image is created in an imaging layer sandwiched between donor and receiver sheets by a conventional manifold imaging process using an imaging electrostatic field of a predetermined voltage. The fracturable manifold image is erased by uniformly applying in the dark a second electrostatic field of the same polarity as the first field but of sufficiently greater strength to cause substantially the entire imaging layer to preferentially adhere to one of the sheets. After the fracturable image has been created, but before erasure, the sandwich can be separated while still under the influence of the first field to provide a positive image on one sheet and a negative image on the other sheet and then reassembled substantially in registration. Subsequent such images can be made and erased provided that the imaging field for each subsequent image has at least the strength of the next previous erasure field.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: April 5, 1977
    Assignee: Xerox Corporation
    Inventors: Philip C. Schoonover, Martin S. Maltz