Patents by Inventor Robert Nestor Joseph van Sluys

Robert Nestor Joseph van Sluys 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).

  • Device for optionally realizing two mutually complementary functions
    Patent number: 4001731
    Abstract: A switchable compression-expansion device, in which a first and a second impedance are included in the emitter circuits of two emitter followers. The impedances are also included in two isolated signal circuits which are coupled via a current mirror circuit. A selection means maintains one of the two emitter followers in the non-conducting state. The current which is produced in the associated impedance by the conducting emitter follower is coupled to the other impedance by the current mirror arrangement. In the other condition of the selection circuit the reverse occurs so that two complementary transfer functions are realized.
    Type: Grant
    Filed: October 2, 1975
    Date of Patent: January 4, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Robert Nestor Joseph Van Sluys
  • Encoding and decoding system for quadraphonic sound
    Patent number: 3968331
    Abstract: Method of encoding quadraphonic signals in four channels, in which for each side the front signal is recorded together with the phase-shifted back signal, and the back signal is recorded together with the supplementarily phase-shifted front signal.
    Type: Grant
    Filed: July 2, 1974
    Date of Patent: July 6, 1976
    Inventor: Robert Nestor Joseph van Sluys