Patents by Inventor Petrus Josef Maria Aarts

Petrus Josef Maria Aarts 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).

  • Circuit arrangement for maintaining the speed of a DC motor constant
    Patent number: 3944901
    Abstract: Circuit arrangement for stabilising the speed of a d.c. motor which is controlled via a control amplifier, and drives a tacho-meter which is connected between the bases of a "long-tailed pair," a tuned circuit being included between the collectors which is tuned to the tacho frequency and which attenuates the other frequencies, the voltage across the tuned circuit being applied to the control amplifier via a charge pump.
    Type: Grant
    Filed: May 2, 1974
    Date of Patent: March 16, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Peter Johannes Michiel Janssen, Petrus Josef Maria Aarts