Patents by Inventor Pierre Crochet

Pierre Crochet 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).

  • Conical scan process in a radar antenna, radar antenna implementing such a process and use of such an antenna in a tracking radar
    Patent number: 4755825
    Abstract: The present invention relates to a conical scanning process in a radar antenna.The antenna comprises a principal parabolic reflector (1) and a primary rear-feed source (2) fed by a circular waveguide (3) and displaced with respect to the focus of the parabolic reflector (1). The conical scanning is produced by the rotary movement of the parabolic reflector (1) about the source (2), the said source (2) and the circular guide (3) remaining fixed.The present invention is applicable to tracking radars operating in the millimeter waveband.
    Type: Grant
    Filed: June 3, 1983
    Date of Patent: July 5, 1988
    Assignee: Thomson CSF
    Inventors: Pierre Crochet, Francois Gautier
  • Airborne interrogation system
    Patent number: 4384290
    Abstract: The system according to the invention utilizes a transmission--reception radar antenna protected by a radome and an interrogation antenna having at least one set of two networks engaged laterally on the outer wall of the radome. The networks are arranged symmetrically to an axis of revolution of the radome. Supply means supply the interrogation antenna with an ultra-high frequency interrogation signal and the switching and phase-displacement means and the networks constitute an electronic scanning antenna.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: May 17, 1983
    Assignee: Thomson-CSF
    Inventors: Robert Pierrot, Francois Gautier, Pierre Crochet
  • Printed monopulse primary source for airport radar antenna and antenna comprising such a source
    Patent number: 4318107
    Abstract: The invention relates to a printed monopulse primary source for a radar antenna.The primary source has, arranged on a first face of a dielectric material substrate, radiating zones forming independent site and bearing difference and sum channels. A receiving supply circuit for the radiating zones is arranged on a second face of the substrate, opposite to the first face. Connecting means ensure the electrical connection of the radiating zones to the receiving supply circuit in the thickness of the substrate.Application to airport radar systems.
    Type: Grant
    Filed: November 20, 1979
    Date of Patent: March 2, 1982
    Assignee: Thomson-CSF
    Inventors: Robert Pierrot, Francois Gautier, Pierre Crochet
  • Polarizer for microwave antenna
    Patent number: 4298876
    Abstract: A reflection-type polarizer for modifying the polarization of an incident electromagnetic wave. The polarizer comprises a reflector positioned at a predetermined distance from a polarization filter constituted by a metal plate having a bi-dimensional periodic network of resonant slots at the operating frequency. The polarizer has application to microwave antenna systems and particularly to Cassegrain antennas.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: November 3, 1981
    Assignee: Thomson-CSF
    Inventor: Pierre Crochet