Patents by Inventor Michael A. Soderstrand

Michael A. Soderstrand 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).

  • Active-R filter
    Patent number: 3955150
    Abstract: An operational amplifier-type active filter in which the only capacitor in the circuit is the compensating capacitance of the operational amplifiers, the various feedback and coupling elements being essentially solely resistive.
    Type: Grant
    Filed: January 15, 1975
    Date of Patent: May 4, 1976
    Assignee: The United States of America as represented by the United States Energy Research & Development Administration
    Inventor: Michael A. Soderstrand