Patents by Inventor William E. Johns

William E. Johns 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).

  • Particle board process using furan resin/isocyanate binder
    Patent number: 4376745
    Abstract: A binder for use in the preparation of particle boards comprising blends of polyisocyanate and furan resins.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: March 15, 1983
    Assignee: Washington State University Research Foundation
    Inventor: William E. Johns
  • Method for making apparatus for testing traces on a printed circuit board substrate
    Patent number: 4328264
    Abstract: Method and apparatus to test continuity of miniature printed circuit board traces prior to installation of components. A short circuits probe and an open circuits probe are each provided which are specific to the pattern of traces to be tested. The probes are constructed by adapting a mirror image of the traces to be tested as probe contact points and registering the adapted mirror image as plating on a second circuit board substrate. Interconnections between contact points are typically provided on the back side of the second substrate. The interconnections couple the contact points with a continuity indicator. The circuit pattern specific probes according to the invention are employed by aligning the contact points with the circuit board traces to be tested and then effecting contact therebetween. The plating forming the contact points is of sufficient uniformity and elevation to provide desired clearance between adjacent traces.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: May 4, 1982
    Assignee: Printed Circuits International, Inc.
    Inventors: William E. Johns, David E. Locklin