Patents by Inventor Delwin O. Johnson

Delwin O. Johnson 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).

  • Ultrasonic cure monitoring of advanced composites
    Patent number: 5009104
    Abstract: Method and apparatus for the non-destructive monitoring of the time dependent curing of an advanced composite positioned within an autoclave where it is subjected to varying pressures and elevated temperatures over a predetermined time period. A tool receiving the uncured advanced composite for receiving an acoustic wave guide which directly coupled to the composite. Ultrasound pulses are directed through the acoustic wave guide and the amplitude of the reflected pulses indicate changes in the modulus of the composite during the cure.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: April 23, 1991
    Assignee: General Dynamics Corporation
    Inventor: Delwin O. Johnson