Patents by Inventor Walter R. Mack

Walter R. Mack 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).

  • Electroluminescent display for a timepiece
    Patent number: 5805533
    Abstract: An illuminated date ring for a calendar wristwatch for viewing the date at night through a window in the dial, employs an electroluminescent (EL) lamp beneath a transparent date ring. The EL lamp electrodes extend around the ring, and flexible spring members make sliding contact with the electrodes as the ring rotates in the movement.
    Type: Grant
    Filed: September 12, 1996
    Date of Patent: September 8, 1998
    Assignee: Timex Corporation
    Inventors: Lyman R. Daigle, Walter R. Mack, Andrew C. Ledesma