Patents by Inventor David A. Walker-Arnott

David A. Walker-Arnott 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).

  • Multicolor ink ribbon control for a typewriter
    Patent number: 4037708
    Abstract: A typewriter ribbon system comprising a ribbon drive device movable in response to the operation of a control device. The system allows the selection and printing of a specific longitudinal portion of a ribbon in the operative impact area.
    Type: Grant
    Filed: January 26, 1976
    Date of Patent: July 26, 1977
    Assignee: Xerox Corporation
    Inventor: David A. Walker-Arnott