Patents by Inventor Charles D. Rollman

Charles D. Rollman 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).

  • Capacitance measurement apparatus
    Patent number: 4243933
    Abstract: Capacitance measurement apparatus in which an output signal representative of the capacitance of a capacitor under test is provided without requirement for absolute measurement of the voltage level or absolute measurement of time interval. A first signal is provided representing the voltage difference between the charge levels of the capacitor. A second signal is provided representing the average current from the capacitor during the time interval that the capacitor undergoes a change in its charge states. The ratio of the second signal to the first signal is representative of capacitance.
    Type: Grant
    Filed: September 20, 1978
    Date of Patent: January 6, 1981
    Assignee: Analogic Corporation
    Inventor: Charles D. Rollman