Patents by Inventor Philip Bierhuizen

Philip Bierhuizen 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).

  • Patent number: 4307275
    Abstract: A membrane switch construction and method for making same. A plate of relatively rigid, flat material is coated with an insulative cover and electrical conductors are formed thereon. A membrane of flexible, plastic material with conductors formed on the underside thereof overlies the plate. A non-conductive spacing means interposed between the conductors has holes in register with the conductors. The spacing means normally holds the conductors in spaced, non-contacting relation. The conductors are movable through the holes in the spacing means in response to pressure on the exterior of the membrane. One or the other or both of the sets of conductors may comprise two tiers of conductors separated by an isolation layer of non-conductive material. Holes are appropriately positioned in the isolation layer to permit access to the buried tier of conductors.
    Type: Grant
    Filed: June 18, 1980
    Date of Patent: December 22, 1981
    Assignee: Oak Industries Inc.
    Inventors: Willis A. Larson, Philip Bierhuizen, Anthony Van Zeeland