Patents by Inventor Cheng K. Jen

Cheng K. Jen 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).

  • Patent number: 4894806
    Abstract: An ultrasonic imaging system for transmitting ultrasonic pulses into an object and detecting reflected ultrasonic waves therefrom. The system is provided with delay lines for real time imaging. The system comprises a probe means having a transmitting bundle of acoustic waveguides for transmitting ultrasonic pulses into an object. The transmitting bundle includes the delay lines which consists of having cladded acoustic waveguides of different lengths for introducing different delays in the ultrasonic pulses carried by each waveguide.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: January 16, 1990
    Assignee: Canadian Patents & Development Ltd.
    Inventors: Cheng K. Jen, Gerald W. Farnell
  • Patent number: 4743870
    Abstract: An elastic waveguide, for propagating acoustic waves, consists of an elongated solid core region and an elongated solid outer cladding region. The acoustic waves propagate in a mode where the principle particle displacement is substantially parallel to the longitudinal axis of the waveguide, this mode is called longitudinal mode. The material densities and the bulk shear wave velocities of the core and cladding region are substantially the same but the bulk longitudinal wave velocity of the cladding region is larger than that of the core region.
    Type: Grant
    Filed: September 23, 1986
    Date of Patent: May 10, 1988
    Assignee: Canadian Patents and Development Ltd.
    Inventors: Cheng K. Jen, Ahmad Safaai-Jazi, Jean F. Bussiere, Gerald W. Farnell