Patents by Inventor Tsang-Chien Shih

Tsang-Chien Shih 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 forming contact of electrical connector and press die for practicing the method
    Patent number: 6439975
    Abstract: A press die for forming a contact of an electrical connector by blanking a metal sheet is disclosed. The die has a die insert for shaving an engaging section of the contact for electrically engaging with a conductive portion of a device mating with the electrical connector so that an electrical connection between the connector and the device is created. A profile of the die insert for the shaving operation is subject to a final finishing process by an ultrasonic machining using a machining agent consisted of diamond particles dispersed in liquid, wherein the diamond particles have a grit size of 8000#. The profile of the die insert has a surface roughness of 0.08 Ra.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: August 27, 2002
    Assignee: Hon Hai Precision Ind. Co., Ltd.
    Inventors: Tsang-Chien Shih, Kuo Ching Lee