Patents by Inventor Demetrios Polyzoes

Demetrios Polyzoes 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).

  • Printing machine with variable counter control system
    Patent number: 4019028
    Abstract: A printing machine includes a counter control system which has a plurality of counters, the system being programmed for any one of various billing schemes by inserting an inexpensive field changeable billing code circuit board into the machine. The operations of the counters vary, depending upon which billing code circuit board is inserted, each counter recording information which is needed for the billing scheme selected.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: April 19, 1977
    Assignee: Xerox Corporation
    Inventor: Demetrios Polyzoes