Patents by Inventor Willem-Arie Sloof

Willem-Arie Sloof 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).

  • FM quadrature demodulator with two phase comparison circuits
    Patent number: 5341107
    Abstract: FM quadrature demodulator having in-phase and quadrature terminals for applying a pair of FM-modulated signals in a mutual phase quadrature thereto, having a modulation signal which is frequency-modulated on a carrier, one of the two terminals being coupled to a first input of a first phase comparison circuit and the other terminal being coupled to a second input of the first phase comparison circuit via a first phase-shifting circuit which realizes a phase shift varying with said modulation signal, the first phase comparison circuit being connected to an output of the FM quadrature demodulator via a low-pass filter.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: August 23, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Wolter Bijker, Wolfdietrich G. Kasperkovitz, Hendricus C. De Ruytere, Willem-Arie Sloof