Patents by Inventor Chih H. Liu

Chih H. Liu 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).

  • Position sensing for matrix printer
    Patent number: 4208137
    Abstract: An alternating current coupled dot column sensing circuit provides delayed dot position signals for control logic of a matrix printer to actuate the printing elements at the proper dot column positions in bi-directional printing. A sensor recognizes edges of slots in a timing strip across the printer and also recognizes end or home positions of the strip for use in such printing.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: June 17, 1980
    Assignee: NCR Corporation
    Inventor: Chih H. Liu