Patents by Inventor Walter H. Mertel

Walter H. Mertel 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).

  • Key module for key-actuated membrane switch panels
    Patent number: 4800245
    Abstract: A key module for a membrane switch keyboard has a flat spring running diagonally to the key housing on the bottom side which, with the aid of a plunger, is bent for the operation of membrane contacts. The flat spring with one free end is inserted into a slot which is open toward the top and permits an adjustment of the flat spring by pressure loading on the free end or on the bottom side against the lower section of the flat spring, which is adjacent to the bent free end. The free end of the flat spring is rigidly retained in a slot at the key housing. For the adjustment of the operating force a compression spring is arranged inside the plunger and is supported against a cross-piece running over the flat spring.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: January 24, 1989
    Assignee: Cherry-Mikroschalter GmbH
    Inventors: Gunter Murmann, Walter H. Mertel