Patents by Inventor Hans-Joachim Viebrantz

Hans-Joachim Viebrantz 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).

  • Touch contact switch
    Patent number: 4952761
    Abstract: A touch contact switch having a plane contact arrangement has a cover of elastic material covering the contact arrangement. Contacting in the contacting arrangement takes place only after a deliberate force P' has been applied which causes a partial surface in the switch to arch in the direction of operation of the switch and to cause contacting in the contacting arrangement.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: August 28, 1990
    Assignee: Preh-Werke GmbH & Co. KG
    Inventor: Hans-Joachim Viebrantz
  • Keyboard with improved key design permitting tilting about either side
    Patent number: 4493959
    Abstract: In a keyboard comprising keys (1) arranged in recesses of a supporting pl (2) and electric contacts of a contact plate (6) disposed below the keys (1) a tilting axis is provided between the key (1) and the supporting plate (2). In order to ensure symmetrical switching behavior a tilting axis is provided on both sides of the key (1). The tilting axes are formed by corners (4, 5) which are abutted at an obtuse angle (W2) by the key (1).
    Type: Grant
    Filed: March 7, 1983
    Date of Patent: January 15, 1985
    Assignee: Preh Elektrofeinmechanische Werke Jakob Preh Nachf., GmbH & Co.
    Inventor: Hans-Joachim Viebrantz