Patents by Inventor Johannes Martinus Augustinus Henricus VAN DER Donk

Johannes Martinus Augustinus Henricus VAN DER Donk 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).

  • Slide switch having resilient movable contact arm twisted to provide efficient electrical connection
    Patent number: 4075441
    Abstract: A slide switch having S-shaped movable contact springs which are movably connected to the contact slide, the free legs of the contact springs being provided with contact areas twisted through an angle of at least 1.degree., so that the switch is substantially crackle-free.
    Type: Grant
    Filed: February 12, 1976
    Date of Patent: February 21, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Wilhelmus Johannes Franciscus Rath, Johannes Martinus Augustinus Henricus VAN DER Donk