Patents by Inventor Stephanie K. Tranberg

Stephanie K. Tranberg 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).

  • Method of fabricating electrical contacts in a printed circuit board
    Patent number: 4316322
    Abstract: Disclosed is a method of fabricating electrical contacts between the conductive layers of a printed circuit board which are spaced apart from each other by respective epoxy layers. The method includes the steps of drilling holes through all of the layers at predetermined points where the electrical contacts are to be made; subsequently washing the board in an acid to remove an epoxy smear that is formed on the walls of the holes by the drilling step; and thereafter rinsing the board in a mixture of 2-butoxyethanol and monoethanolamine to remove chemical byproducts of the epoxy smear and the acid.
    Type: Grant
    Filed: October 25, 1979
    Date of Patent: February 23, 1982
    Assignee: Burroughs Corporation
    Inventor: Stephanie K. Tranberg