Patents Represented by Attorney C. A. Green

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  • Extended range color electrophotographic method by superimposing a half-tone image on a low density continuous tone image
    Patent number: 4088481
    Abstract: An electrophotographic printing machine and method of use therefor in which a first image having a density less than that of the original document being reproduced is formed on a sheet of support material. A half-tone image having substantially the density of the original document is reproduced, in superimposed registration with the first image, on the sheet of support material. This produces a high quality copy having substantially the density of the original document.
    Type: Grant
    Filed: January 8, 1976
    Date of Patent: May 9, 1978
    Assignee: Xerox Corporation
    Inventor: Karl B. Ayash
  • Replenishable photosensitive system
    Patent number: 4088403
    Abstract: A reproducing machine in which successive photosensitive members are advanced from storage to the operative location therein. Each photosensitive member is used in the reproducing machine a predetermined interval and then automatically removed therefrom with the next successive photosensitive member being advanced thereto.
    Type: Grant
    Filed: August 27, 1976
    Date of Patent: May 9, 1978
    Assignee: Xerox Corporation
    Inventor: William Kingsley
  • Purging system for a development apparatus
    Patent number: 4086006
    Abstract: An apparatus in which a latent image recorded on a member is developed with particles. The apparatus includes a housing having a chamber for storing a supply of particles therein. During the development process, particles are deposited on the latent image recorded on the member. These particles are purged from the chamber of the housing to permit particles of a different color to be disposed therein.
    Type: Grant
    Filed: September 30, 1976
    Date of Patent: April 25, 1978
    Assignee: Xerox Corporation
    Inventors: Oscar G. Hauser, Frederick R. Ruckdeschel
  • Sheet feeding apparatus
    Patent number: 4085673
    Abstract: A sheet feeding apparatus in which successive sheets are separated and advanced from a stack thereof. As the sheet advances from the stack, it is aligned. After alignment, a conveyor moves the sheet to a delivery station. The aligning mechanism moves into the sheet path in response to the conveyor reaching a first predetermined position. When the conveyor moves to a second predetermined position, the aligning mechanism is spaced from the sheet path.
    Type: Grant
    Filed: August 12, 1974
    Date of Patent: April 25, 1978
    Assignee: Xerox Corporation
    Inventor: Ronald R. Wierszewski
  • Multi-frequency screen
    Patent number: 4083632
    Abstract: A half-tone screen in which a substantially transparent substrate has a plurality of opaque regions disposed thereon. The opaque regions are arranged in at least a high frequency repetitive pattern and a low frequency repetitive pattern. This type of screen may be employed to modulate the light image of a color transparency being reproduced by an electrophotographic printing machine.
    Type: Grant
    Filed: April 5, 1976
    Date of Patent: April 11, 1978
    Assignee: Xerox Corporation
    Inventors: Louis D. Mailloux, James E. Bollman
  • Lamp carriage drive system
    Patent number: 4082444
    Abstract: An apparatus in which an article is illuminated by a light source moving thereacross. Vibration of the light source is minimized during the movement thereof.
    Type: Grant
    Filed: April 30, 1976
    Date of Patent: April 4, 1978
    Assignee: Xerox Corporation
    Inventors: Sukumaran K. Menon, Stephen J. Wenthe, Jr.
  • Multi-color development system
    Patent number: 4082061
    Abstract: An apparatus arranged to develop a latent image recorded on a member with particles stored in the chamber of the housing. A plurality of differently colored particles are housed remotely from the chamber. Particles of a selected color are advanced to the chamber so as to be deposited on the latent image.The foregoing abstract is neither intended to define the invention disclosed in the specification, nor is it intended to be limiting as to the scope of the invention in any way.
    Type: Grant
    Filed: March 14, 1977
    Date of Patent: April 4, 1978
    Assignee: Xerox Corporation
    Inventor: Lawrence J. Fraser
  • Fuser drive system
    Patent number: 4081213
    Abstract: A fusing apparatus in which particles are substantially permanently affixed to a sheet. The fusing apparatus includes a fusing member operatively associated with a back-up member to define a nip through which a sheet passes. In the operating mode, the fuser member is heated to the operating temperature with liquid release material being applied thereto. The fuser member is heated to a temperature lower than the operating temperature in the standby mode. To prevent the formation of a bead release material on the fuser member in the standby mode of operation, relative movement is generated between the fuser member and backup member.
    Type: Grant
    Filed: April 29, 1976
    Date of Patent: March 28, 1978
    Assignee: Xerox Corporation
    Inventors: Ari Bar-on, Louis R. Hattler
  • Device for replenishing toner particles
    Patent number: 4080054
    Abstract: An apparatus in which a developer mix of magnetic carrier granules having toner particles adhering triboelectrically thereto is brought into contact with an electrostatic latent image. The latent image attracts at least a portion of the toner particles thereto. A magnetic belt receives the denuded carrier granules and moves them into position to attract toner particles thereto from the chamber of a storage housing.
    Type: Grant
    Filed: November 26, 1976
    Date of Patent: March 21, 1978
    Assignee: Rank Xerox Ltd.
    Inventor: Toshio Watanabe
  • Half-tone color copier
    Patent number: 4080055
    Abstract: An optical system in which successive color filtered light images pass through a screen positioned at discrete preselected angles. An un-filtered light image is transmitted through the screen with the screen being positioned at one of the preselected angles for the filtered light image.
    Type: Grant
    Filed: June 21, 1976
    Date of Patent: March 21, 1978
    Assignee: Xerox Corporation
    Inventor: Robert E. Gary
  • Photoconductor incrementing apparatus
    Patent number: 4076183
    Abstract: An apparatus in which a photoconductive belt is incremented to advance unused portions thereof to an operative location as used portions advance to an inoperative location. The apparatus advances automatically portions of the photoconductive belt as the belt support member moves a pre-selected interval.
    Type: Grant
    Filed: February 18, 1977
    Date of Patent: February 28, 1978
    Assignee: Xerox Corporation
    Inventor: William Kingsley
  • Screen for an electrophotographic printing machine
    Patent number: 4072414
    Abstract: An electrophotographic printing machine in which a transparency light image is projected through a screen having a plurality of opaque regions. At least a portion of the opaque regions have a light reflecting surface on one side thereof and a light absorbing surface on the other side thereof. The screen is positioned so that the light reflecting surfaces of the opaque regions form a visual image of the transparency light image being projected therethrough. Incident light rays are absorbed by the absorbing surfaces of the opaque regions.
    Type: Grant
    Filed: October 29, 1976
    Date of Patent: February 7, 1978
    Assignee: Xerox Corporation
    Inventor: William J. Hanson
  • Electrostatic color printing utilizing discrete potentials
    Patent number: 4068938
    Abstract: An apparatus in which an electrostatic latent image is developed simultaneously in two colors. A first portion of the latent image has a potential greater than a first threshold with a second portion thereof having a potential less than a second threshold. The second threshold is less than the first threshold. Particles of a first color are applied to the first portion of the latent image with particles of a second color being applied to the second portion of the latent image. The electrostatic latent image is discharged to a potential less than the second potential and portions thereof having a potential greater than the second threshold by a pre-selected level.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: January 17, 1978
    Assignee: Rank Xerox Ltd.
    Inventor: Robert Robertson
  • Color transparency reproducing machine
    Patent number: 4068939
    Abstract: An electrophotographic printing machine in which color transparencies are reproduced. A projected image of the color transparency is scanned forming a light image thereof. The light image is modulated and filtered creating a single color half-tone light image. A charged photoconductive member is irradiated by the single color half-tone light image recording a single color electrostatic latent image thereon.
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: January 17, 1978
    Assignee: Xerox Corporation
    Inventor: Louis D. Mailloux
  • Variable contrast optical screening system
    Patent number: 4068940
    Abstract: An electrophotographic printing machine in which a latent image of an original document and a screen pattern are formed on a photoconductive member in superimposed registration with one another. The contrast of the screen pattern is regulated.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: January 17, 1978
    Assignee: Xerox Corporation
    Inventor: Richard M. Bobbe
  • Half tone imaging system
    Patent number: 4066353
    Abstract: A half-tone screen in which a first and second set of grooves are inscribed in a transparent member. The grooves are arranged in a repetitive pattern with each groove from the first set being interposed between adjacent grooves of the second set, and the width of each groove of the first set being greater than the width of each groove of the second set.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: January 3, 1978
    Assignee: Xerox Corporation
    Inventor: Richard M. Bobbe
  • Variable illumination optical system
    Patent number: 4066351
    Abstract: An optical system in which a screen modulates the light produced thereby. The intensity of the light image is varied as a function of screen position.
    Type: Grant
    Filed: February 20, 1976
    Date of Patent: January 3, 1978
    Assignee: Xerox Corporation
    Inventor: Wayne L. Kidd
  • Programmable development control system
    Patent number: 4065031
    Abstract: A control device in which the dispensing of particles from a storage container to a mix is regulated. At predetermined sampling intervals, the concentration of particles in the mix is detected and a signal indicative thereof generated. These signals are summed and processed by a program to develop an actuating signal. The actuation signal energizes the storage container to dispense particles into the mix.
    Type: Grant
    Filed: July 23, 1976
    Date of Patent: December 27, 1977
    Assignee: Xerox Corporation
    Inventors: Douglas G. Wiggins, Edward L. Kushall
  • Color transparency reproducing machine
    Patent number: 4063810
    Abstract: An electrophotographic printing machine in which color transparencies are reproduced. A projected image of the color transparency is scanned forming a light image thereof. The light image is modulated and filtered creating a single color half-tone light image. A charged photoconductive member is irradiated by the single color half-tone light image recording a single color electrostatic latent image thereon.
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: December 20, 1977
    Assignee: Xerox Corporation
    Inventor: Louis D. Mailloux
  • Single component color development system
    Patent number: 4057340
    Abstract: An apparatus in which a latent image is developed with particles. A support member advances the particles from a storage chamber to the development zone. In the development zone, the particles are separated from the support member and attracted to the latent image. This develops the latent image with these particles.
    Type: Grant
    Filed: January 22, 1976
    Date of Patent: November 8, 1977
    Assignee: Xerox Corporation
    Inventor: Lloyd F. Bean