Patents by Inventor Castle Chen

Castle Chen 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).

  • Key switch
    Patent number: 5340956
    Abstract: Disclosed is a key switch formed by molding a silicone rubber key base to a rubber key body, wherein the rubber key body has a neck portion in the middle and a center recess on a bottom surface thereof for bonding the silicone rubber key base through a low-pressure, low-temperature molding process; the silicone rubber key base has a short plunger supported within a circular sloping wall portion at a higher elevation for touch control and quick return.
    Type: Grant
    Filed: February 10, 1993
    Date of Patent: August 23, 1994
    Assignee: Silitek Corporation
    Inventor: Castle Chen