Patents by Inventor Chao-Ning Liu

Chao-Ning 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).

  • Apparatus and method for characterizing an acoustic field
    Patent number: 4350045
    Abstract: An apparatus for and method of characterizing an acoustic field, and particularly of visually characterizing the field. An acoustic receiving transducer means is moved to a plurality of predetermined coordinate and angular positions in the acoustic field, and for each such position an electrical signal indicative of a parameter of the acoustic field is stored in a memory. The information in the memory is selectively retrieved to activate an electronic display means, and to expose film if desired, to provide a visual "map" of the acoustic field parameter detected.
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: September 21, 1982
    Assignee: International Business Machines Corporation
    Inventors: Chao-Kong Chow, Chao-Ning Liu, Sherman S. Wang