Patents by Inventor Frederick C. Campbell

Frederick C. Campbell 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).

  • Surface vibration analysis
    Patent number: 5140994
    Abstract: A method for determining motility comprising the detection, by means such as a transducer, of vibration of the external abdominal surface generated by gastrointestinal vibration and analysis of the signals produced by the transducer. Means are provided for integrating the signal over discrete time intervals in order to obtain meaningful results.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: August 25, 1992
    Assignee: National Research Development Corporation
    Inventors: Frederick C. Campbell, Brian E. Storey
  • Piezoelectric charging device
    Patent number: H372
    Abstract: A piezoelectric charging device in which a rocket with a rocket motor uties pressure from the rocket motor to squeeze a piezoelectric crystal and utilizes the current produced from squeezing the piezoelectric crystal in a full wave bridge circuit to charge a capacitor that can then be used as a power source for a warhead.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: November 3, 1987
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Frederick C. Campbell