Patents by Inventor John D. Blades

John D. Blades 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).

  • Ion modulator having bias electrode for regulating control fields
    Patent number: 4092160
    Abstract: An ion modulator having a bias electrode is capable of producing copies in which the contrast and background are controllable. Such modulator functions in a process which utilizes an adjustable charge density applied to set up uniform fringing fields of the desired magnitude which block ions directed towards background (light) areas. Funneling fields are set up in image (dark) areas in opposition to the original fringing fields by simultaneous imaging and ion projection, decreasing the effect of such fringing fields and permitting ions to pass through the modulator in image areas.
    Type: Grant
    Filed: March 25, 1975
    Date of Patent: May 30, 1978
    Assignee: Addressograph-Multigraph Corp.
    Inventors: Jerome E. Jackson, John D. Blades
  • Duplicating apparatus employing modulator screen cylinder
    Patent number: 4044671
    Abstract: A duplicating apparatus is equipped with a photoconductive modulator screen cylinder for making reproductions of a graphic original on a dielectric receiving medium utilizing aperture-controlled electrostatic printing techniques. Means is provided for creating a charge distribution system on the surface of the modulator corresponding to an image to be reproduced from the graphic original. The apparatus also comprises charging means for projecting gas ions against the modulator screen cylinder, electrode means for collecting the gas ions selectively transmitted by the modulator screen cylinder on the dielectric receiving medium and means for developing the dielectric receiving medium to create a visible image.
    Type: Grant
    Filed: January 16, 1976
    Date of Patent: August 30, 1977
    Assignee: Addressograph-Multigraph Corporation
    Inventors: Shou L. Hou, John D. Blades
  • Charged particle modulator device and improved imaging methods for use thereof
    Patent number: 3986871
    Abstract: The invention is an improved modulator, in the form of a screen, having the capability of selectively passing therethrough charged particles, such as gas ions, in accordance with a pattern that corresponds to the image and non-image areas of a graphic original. The apertured modulator is formed from a metal screen, such as a 200 mesh wire screen, having a wire cross section of 0.051 millimeter and is overcoated with a four-micron thickness of a photoconductor, such as selenium or an organic photoconductor, over which is next applied an equal thickness of an insulating layer, such as polystyrene. The three-layered modulator constructed in this manner is imparted a charge pattern corresponding to the graphic subject to be reproduced by the creation of a charge distribution system (CDS) on the insulating surface. The CDS created on the modulator in the environment of this invention is completely passive to electromagnetic radiation.
    Type: Grant
    Filed: December 12, 1973
    Date of Patent: October 19, 1976
    Assignee: Addressograph-Multigraph Corporation
    Inventors: John D. Blades, Jerome E. Jackson