Patents by Inventor Mamoru Fujioka

Mamoru Fujioka 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 for breaking conducting path formed on or in printed-circuit board and laser system for using the method
    Patent number: 5535903
    Abstract: This invention provides a method for breaking a conducting path formed on or in a printed-circuit board. The method comprises steps of arranging a laser source and the printed-circuit board, irradiating a laser beam from the laser source onto a conductive inner wall portion of a through hole in the printed-circuit board so as to remove the conductive inner wall portion of the through hole from the printed-circuit board, and irradiating the laser beam onto a conductive contacting portion where a wiring pattern contacts with a land so as to remove the contacting portion from the printed-circuit board. This invention also relates to a laser system using the method and a printed-circuit board modified by the method.
    Type: Grant
    Filed: August 17, 1994
    Date of Patent: July 16, 1996
    Assignee: Fujitsu Limited
    Inventor: Mamoru Fujioka