Patents by Inventor Allistair Towle

Allistair Towle 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).

  • VOR antenna design
    Patent number: 4746927
    Abstract: A VOR antenna array with a plurality of radiating antenna elements spaced around and arranged on the periphery of an essentially circular path. The elements extend in the same direction around the periphery of the circular path and a central feed point is connected to the equivalent end of each radiating element by a feed-line to form a multi-sectored loop fed at the junction of each sector by in-phase sources.
    Type: Grant
    Filed: November 1, 1985
    Date of Patent: May 24, 1988
    Assignee: U.S. Philips Corporation
    Inventor: Allistair Towle
  • Stabilized crystal controlled oscillator
    Patent number: 4028638
    Abstract: The invention relates to an oscillator having a positive feedback amplifier circuit the gain of which is controlled in direct opposite relationship to the amplitude of the oscillatory voltage produced by the oscillator and is especially useful for crystal controlled oscillators. The controlled feedback amplifier comprises a differential amplifier one branch of which feeds a rectifier producing the control voltage and the other branch of which acts as the controlled feedback amplifier.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: June 7, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Allistair Towle
  • Electronic modulator for guidance systems
    Patent number: 3965443
    Abstract: An amplitude modulation system having a modulation control circuit including a limiter for the modulation signal, a detector for deriving a DC contr0l signal from the unmodulated carrier, a first adjustable network connected to the detector to produce a signal applied to a modulation control circuit for adjusting depth of modulation, and an additional adjustable network connected between the detector and the modulator to produce a signal for adjusting the modulated carrier.
    Type: Grant
    Filed: September 25, 1974
    Date of Patent: June 22, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Allistair Towle, Stanko Brcic