Patents by Inventor Horia Dumitrescu

Horia Dumitrescu 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).

  • Dihedral deflection cathode for an X-ray tube
    Patent number: 5224143
    Abstract: The invention relates to X-ray tubes. The cathode for an X-ray tube has two filaments associated with a deflecting and focusing device which comprises at least three metal parts which are electrically insulated from one another and which are raised to electrical voltages. First and second ones of the metal, parts are associated with a first filament, while the second metal part and a third metal part are associated with the second filament.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: June 29, 1993
    Assignee: General Electric CGR S.A.
    Inventors: Horia Dumitrescu, Bernard Evain, Antoine Simeone
  • Method, tube and system for eliminating a fixed antiscatter grid in a radiological image
    Patent number: 5195120
    Abstract: In a radiological apparatus using an antiscatter grid, this grid is kept fixed instead of being movable, and its image is removed by irradiating it as well as the object to be examined by two X-ray sources that have to be separated by a distance b determined by the first zero of the modulation transfer function of this two-source system. To take account of the magnification G, the distance b can be adjusted by means of a cathode emitting two electron beams with adjustable deflection.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: March 16, 1993
    Assignee: General Electric CGR S.A.
    Inventors: Bernard Evain, Olivier Peyret, Horia Dumitrescu
  • X-ray scanning tube with deflecting plates
    Patent number: 5125019
    Abstract: In an x-ray tube of the beam deflection type for a radiology apparatus, the stair-steps of the focusing device of the electron beam are extended by metallic deflecting electrodes placed in parallel relation to said stair-steps and electrically insulated from these latter by means of insulating layers. Said electrodes are brought to different potentials, the polarities and values of which depend on the direction and amplitude of deflection to be obtained.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: June 23, 1992
    Assignee: General Electric CGR SA
    Inventors: Bernard Evain, Horia Dumitrescu, Jean-Marie Fourmigue