Patents by Inventor Joseph D. Dahl

Joseph D. Dahl 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).

  • Variable rate timer for a cardiac pacemaker
    Patent number: 4140132
    Abstract: A timing device having a self-generating voltage source to modify the constant rate of a cardiac pacemaker in which the resulting improvement consists in making the constant rate of a cardiac pacemaker a variable rate as a function of physical activity.
    Type: Grant
    Filed: March 23, 1978
    Date of Patent: February 20, 1979
    Inventor: Joseph D. Dahl
  • Visual indicating electronic output tester
    Patent number: D249246
    Type: Grant
    Filed: September 17, 1976
    Date of Patent: September 5, 1978
    Inventor: Joseph D. Dahl