Patents by Inventor Leonardus Adrianus Johannes Verhoeven

Leonardus Adrianus Johannes Verhoeven 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).

  • Color television recording system employing frequency modulation and pulse width modulation
    Patent number: 4045812
    Abstract: A color television system for transmitting a color television signal, specifically for recording on and subsequently reproducing from a record carrier. The color television signal to be transmitted contains a first carrier which is frequency-modulated with the luminance information and a second carrier which is modulated with the chrominance information, whose frequency lies between zero and the first-order lower side band of the modulated first carrier which corresponds to the highest modulation frequency. Said second carrier does not have a fixed frequency, but is locked to the instantaneous frequency of the modulated first carrier by a constant integral ratio. Depending on the characteristics of the transmission medium and the signal processing equipment said ratio is preferably two or three.
    Type: Grant
    Filed: December 19, 1975
    Date of Patent: August 30, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Leonardus Adrianus Johannes Verhoeven, Maarten Rutger De Haan, Peter Johannes Michiel Janssen
  • Color television system in which the chrominance subcarrier is locked to the frequency-modulated luminance signal
    Patent number: 3982272
    Abstract: A color television system for transmitting a color television signal, specifically for recording on and subsequently reproducing from a record carrier. The color television signal to be transmitted contains a first carrier which is frequency-modulated with the luminance information and a second carrier which is modulated with the chrominance information, whose frequency lies between zero and the first-order lower side band of the modulated first carrier which corresponds to the highest modulation frequency. Said second carrier does not have a fixed frequency, but is locked to the instantaneous frequency of the modulated first carrier by a constant integral ratio. Depending on the characteristics of the transmission medium and the signal processing equipment said ratio is preferably two or three.
    Type: Grant
    Filed: May 3, 1974
    Date of Patent: September 21, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Leonardus Adrianus Johannes Verhoeven, Maarten Rutger DE Haan, Peter Johannes Michiel Janssen
  • Vidicon with grid wire angles selected to minimize chrominance signal interference
    Patent number: 3946265
    Abstract: A television camera tube having a conductive gauze behind the target plate, the parallel wires of which cross each other at an acute angle which has been suitably chosen to minimize interference in decoded colour signals.
    Type: Grant
    Filed: December 10, 1971
    Date of Patent: March 23, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Leonardus Adrianus Johannes Verhoeven