Patents by Inventor Kathleen M. Gerew

Kathleen M. Gerew 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).

  • Security document using a variable dot screen
    Patent number: 4341404
    Abstract: An improved copy-proof document is disclosed having a cancellation phrase and a background pattern each printed of a plurality of elements of a geometric shape having one or more smaller uncovered areas within said geometrically shaped element.
    Type: Grant
    Filed: February 11, 1980
    Date of Patent: July 27, 1982
    Assignee: Burroughs Corporation
    Inventors: William H. Mowry, Jr., Kathleen M. Gerew