Patents by Inventor Christopher Knerr

Christopher Knerr 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).

  • In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels
    Patent number: 5719337
    Abstract: An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: February 17, 1998
    Assignee: Institute of Paper Science and Technology, Inc.
    Inventors: Maclin S. Hall, Theodore G. Jackson, Christopher Knerr
  • In-plane ultrasonic velocity measurement
    Patent number: 5525854
    Abstract: An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: June 11, 1996
    Assignee: Institute of Paper Science and Technology, Inc.
    Inventors: Maclin S. Hall, Theodore G. Jackson, Christopher Knerr
  • Method and system of measuring ultrasonic signals in the plane of a moving web
    Patent number: 5493910
    Abstract: An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like. In addition to velocity measurements of ultrasonic signals in the plane of the web in the machine direction, MD, and a cross direction, CD, generally perpendicular to the direction of the traveling web, therefor, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: February 27, 1996
    Assignee: Institute of Paper Science and Technology, Inc.
    Inventors: Maclin S. Hall, Theodore G. Jackson, Wilmer A. Wink, Christopher Knerr