Patents by Inventor Michael C. Pao

Michael C. Pao 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).

  • Miniature, high efficiency dual frequency ultrasonic transducer with selectable beamwidth
    Patent number: 6025670
    Abstract: Ultrasonic transducer with a selectable beamwidth comprising a body of piezoelectric material in the form of an annulus having an outer diameter D and a thickness T. The body has proximal and distal generally planar parallel surfaces and a centrally disposed hole extending therethrough. The body has a cylindrical wall with a width W extending from the hole to the outer diameter. The transducer is capable of operating at low and high resonance frequencies with the low frequency resonance being determined by the diameter D and an aspect ratio of D/T and the high frequency resonance being determined by the thickness T and an aspect ratio of W/T.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: February 15, 2000
    Assignee: Cardiometrics, Inc.
    Inventors: Paul D. Corl, Michael C. Pao, Vincent A. Barletta, Victor Chechelski
  • Method of making a miniature, high efficiency dual frequency ultrasonic transducer
    Patent number: 5740596
    Abstract: Ultrasonic transducer with a selectable beamwidth comprising a body of piezoelectric material in the form of an annulus having an outer diameter D and a thickness T. The body has proximal and distal generally planar parallel surfaces and a centrally disposed hole extending therethrough. The body has a cylindrical wall with a width W extending from the hole to the outer diameter. The transducer is capable-of operating at low and high resonance frequencies with the low frequency resonance being determined by the diameter D and an aspect ratio of D/T and the high frequency resonance being determined by the thickness T and an aspect ratio of W/T.
    Type: Grant
    Filed: December 2, 1996
    Date of Patent: April 21, 1998
    Assignee: Cardiometrics, Incorporated
    Inventors: Paul D. Corl, Michael C. Pao, Vincent A. Barletta, Victor Chechelski
  • Miniature, high efficiency dual frequency ultrasonic transducer with selectable beamwidth and apparatus
    Patent number: 5581144
    Abstract: Ultrasonic transducer with a selectable beamwidth comprising a body of piezoelectric material in the form of an annulus having an outer diameter D and a thickness T. The body has proximal and distal generally planar parallel surfaces and a centrally disposed hole extending therethrough. The body has a cylindrical wall with a width W extending from the hole to the outer diameter. The transducer is capable of operating at low and high resonance frequencies with the low frequency resonance being determined by the diameter D and an aspect ratio of D/T and the high frequency resonance being determined by the thickness T and an aspect ratio of W/T.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: December 3, 1996
    Assignee: Cardiometrics, Inc.
    Inventors: Paul D. Corl, Michael C. Pao, Vincent A. Barletta, Victor Chechelski