Patents by Inventor Jacob S. Visser

Jacob S. Visser 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).

  • Negative immittance converter
    Patent number: 4873502
    Abstract: A negative admittance converter or a negative impedance converter can be formed from a negative immitance converter having two preferably identical transformers each having a center tapped coil and respective coil end terminals. One end of each of the coils is connected through a first amplifier element, and the other ends are connected through a second amplifier element, the amplifier elements having control inputs connected to a 180.degree. phase shifter. The phase shifter is formed by a voltage differential amplifier having one input connected to a voltage divider connected across the first amplifier element, and the other input connected to a voltage divider connected across the other amplifier element, the amplifier differential outputs being connected to the control inputs of the first and second amplifier elements.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: October 10, 1989
    Assignee: U.S. Philips Corporation
    Inventor: Jacob S. Visser