Patents by Inventor Marta E. Stewart

Marta E. Stewart 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).

  • Closely spaced back-lit push button array
    Patent number: 5012054
    Abstract: A back-lit push button array which permits close spacing of the buttons while preventing light leaks between the buttons. The buttons are individually keyed into the outer shell of a housing to provide lateral support while permitting axial movement, and interleaving laterally extending features are formed on juxtaposed sidewalls of the buttons within the housing to prevent interbutton light leaks. This permits the buttons to be spaced very closedly, and there is no limitation on the size of the symbols or legends other than the dimensions of the button face itself.
    Type: Grant
    Filed: May 14, 1990
    Date of Patent: April 30, 1991
    Assignee: Delco Electronics Corporation
    Inventors: Mark Z. Rada, John W. Willis, Marta E. Stewart