Patents by Inventor John R. Rumsey

John R. Rumsey 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).

  • Printer RF line control
    Patent number: 4990942
    Abstract: An improved controller for a printhead having crossed first and second sets of electrodes determines whether any electrode of the second set is to be activated, and disables an electrode of the first set if it determines that no second electrode is active. By reducing the number of times the first electrodes are actuated printhead life and print quality are improved. In one embodiment, the controller ORs the second electrode control signals to develop an output which enables the first electrodes.
    Type: Grant
    Filed: April 4, 1990
    Date of Patent: February 5, 1991
    Assignee: Delphax Systems
    Inventors: Roger H. Therrien, John R. Rumsey