Patents by Inventor Craig Neal Johnston

Craig Neal Johnston 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).

  • Transformer formed in conjunction with printed circuit board
    Patent number: 6188305
    Abstract: A transformer comprises a printed circuit board having elongated conductors printed thereon, a ferrite core having a bottom mounted onto the printed circuit board and a flex circuit. The flex circuit comprises a dielectric sheet and elongated conductors printed on both faces of the sheet. The flex circuit is contoured around a top and sides of the core. The conductors of the flex circuit are surface bonded to respective conductors of the printed circuit board to form a series of primary windings and a series of secondary windings around the core. Provision of the upper portions of the windings by means of the flex circuit is economical because it does not require handling of discrete conductor portions.
    Type: Grant
    Filed: December 8, 1995
    Date of Patent: February 13, 2001
    Assignee: International Business Machines Corporation
    Inventors: Chi Shih Chang, Michael Joseph Johnson, Craig Neal Johnston, John Matthew Lauffer