Patents Represented by Attorney George J. Cannon
  • Patent number: 4115786
    Abstract: Constant wavelength magnetic imaging is provided by generating a signal having a frequency proportional to the speed of a rotational recording member, multiplying that frequency up to a higher, desired recording frequency, and phase-locking the higher frequency signal to the unmultiplied lower frequency, thus synchronizing the recording frequency with the motor speed.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: September 19, 1978
    Assignee: Xerox Corporation
    Inventors: Thomas M. Frey, Stephen F. Pond
  • Patent number: 4112156
    Abstract: Airborne magnetic toner is recovered from the vicinity of a magnetizable recording medium by magnetically attracting the toner with a magnetic field which does not alternate in magnetic polarity thereby magnetically polarizing the toner; and, subsequently passing the polarized magnetic toner through a magnetic field which alternates in magnetic polarity thereby decreasing the magnetic polarization of the magnetic toner. This procedure maintains the flow characteristics of the toner and avoids the clumping together of toner normally associated with magnetic recovery of magnetic toner.
    Type: Grant
    Filed: February 14, 1977
    Date of Patent: September 5, 1978
    Assignee: Xerox Corporation
    Inventor: Stanley B. Swackhamer
  • Patent number: 4108112
    Abstract: An improvement in development apparatus for developing a latent image with magnetic toner having a development zone defined at least in part by a sloping wall member along which magnetic toner migrates under the influence of gravity, residing in providing a flux channeling member affixed to the sloping wall member and within the development zone. Magnetic flux emanating from latent magnetic images passing through the development zone are channeled by the magnetic flux member and in cooperation with the magnetic toner forms a magnetic seal which prevents the flow of toner from the development zone. The present invention obviates the need to utilize a physical barrier which can cause damage to the surface of imaging members.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: August 22, 1978
    Assignee: Xerox Corporation
    Inventor: Frederick W. Hudson
  • Patent number: 4108111
    Abstract: A development system for developing latent magnetic images with magnetic toner comprises a developer housing having an upper chamber communicating through a selectively variable opening with a lower chamber, the lower chamber defining the development zone and being provided with peripheral edge seals. In operation, magnetic toner is gravity fed through the selectively variable opening to the lower chamber, filling the lower chamber to provide flood contact development of the latent magnetic image residing on a magnetizable member which is moved in a direction counter to that of gravity flow. Optional baffles are preferably included in the developer housing and above the development zone to prevent machine contamination by toner powder cloud during high speed development.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: August 22, 1978
    Assignee: Xerox Corporation
    Inventor: Frederick W. Hudson
  • Patent number: 4101943
    Abstract: Synchronization of pixels in tracks of magnetically recorded information is provided by insuring that pixels are of substantially uniform width, particularly the first recorded pixel in each recorded track. Uniform width of pixels, particularly first pixels, is achieved through a triggering circuit which begins recording the first pixel of each track only when the record head is at the proper location. The circuit is capable of delaying the recording of a track to within a pixel length of time and divides the pixel length of time to some predetermined plurality of track recording starting points.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: July 18, 1978
    Assignee: Xerox Corporation
    Inventor: Thomas M. Frey
  • Patent number: 4101320
    Abstract: A magnetic imaging system is disclosed wherein an optical image is first reduced to a graphic image by employing a magnetizable marking material followed by magnetization of the graphic image and transfer of the imagewise pattern of magnetization to a magnetic substrate to provide a latent magnetic image. The latent magnetic image is utilized for the purpose of image duplicating by successive development and transfer steps or for electronic transmission of information. Improved latent magnetic images are provided by retoning the graphic image after magnetization and further magnetizing the retoned graphic image from which the latent image is produced. Also, polishing the redeveloped graphic image further improves the quality of the latent image.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: July 18, 1978
    Assignee: Xerox Corporation
    Inventors: Edward C. Sellers, Chandler Malkani
  • Patent number: 4101321
    Abstract: An imaging system wherein an imaged migration-type imaging member is provided and either the background of image areas of said image are selectively reduced to a more transparent condition. The imaged member comprises a softenable layer containing agglomerable materials in both image and complementary background configurations. Such imaged members may be provided by migration imaging techniques described herein. This member is contacted with solvent vapors capable of softening the softenable layer and heated, thereby causing the agglomerable material to selectively agglomerate in one of either the background or image areas.
    Type: Grant
    Filed: September 14, 1970
    Date of Patent: July 18, 1978
    Assignee: Xerox Corporation
    Inventors: Mortimer Levy, William L. Goffe
  • Patent number: 4100088
    Abstract: A composition responsive to magnetic fields and comprising a ferrofluid and metal flakes. The metal flakes align with the ferrofluid in response to magnetic lines of force and along the magnetic lines of force. Excellent contrast is provided between portions of the composition wherein the metal flakes are seen along edges or ends and portions of the composition wherein the broad surface area of the flakes are presented to view.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: July 11, 1978
    Assignee: Xerox Corporation
    Inventors: Werner E. L. Haas, Gary A. Dir
  • Patent number: 4096485
    Abstract: A magnetic imaging system is disclosed wherein an optical image is first reduced to a graphic image by employing a magnetizable marking material followed by magnetization of the graphic image and transfer of the imagewise pattern of magnetization to a magnetic substrate to provide a latent magnetic image. The latent magnetic image is utilized for the purpose of image duplicating by successive development and transfer steps or for electronic transmission of information. Improved latent magnetic images are provided by retoning the graphic image after magnetization and further magnetizing the retoned graphic image from which the latent image is produced. Also, polishing the redeveloped graphic image further improves the quality of the latent image.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: June 20, 1978
    Assignee: Xerox Corporation
    Inventors: Edward C. Sellers, Chander Malkani
  • Patent number: 4095233
    Abstract: An ink jet apparatus deposits a pattern of charged, substantially colorless droplets on an insulating imaging surface. The droplets are dried to leave an electrostatic charge pattern. The charge pattern is developed using conventional techniques and can be electronically read.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: June 13, 1978
    Assignee: Xerox Corporation
    Inventor: William L. Goffe
  • Patent number: 4092954
    Abstract: A development system for developing latent magnetic images with magnetic toner at high speeds comprises a developer housing comprising an upper toner supply chamber communicating through an opening with a sealed developer zone.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: June 6, 1978
    Assignee: Xerox Corporation
    Inventor: Frederick W. Hudson
  • Patent number: 4084966
    Abstract: An imaging system wherein a migration-type imaging member comprising a softenable layer containing agglomerable migration marking material is provided, and the member is exposed to an image pattern of electromagnetic radiation of sufficient energy to cause a simultaneous imagewise migration at least in depth in the softenable layer and agglomeration of the agglomerable migration marking material in the imagewise exposed areas of the imaging member. In another embodiment, a microscopically discontinuous layer of imaging material on a stable substrate is agglomeration or evaporation imaged by the inventive system.
    Type: Grant
    Filed: October 26, 1970
    Date of Patent: April 18, 1978
    Assignee: Xerox Corporation
    Inventors: Werner E. L. Haas, James E. Adams, Bela Mechlowitz
  • Patent number: 4082549
    Abstract: An imaging member comprising an agglomerable layer on and not embedded in a substrate is agglomerated in image configuration to cause relative transparentizing or a color change and the formation of larger agglomerates in the agglomerated areas. This imaging process is followed by removal of the agglomerates from the agglomerated areas.
    Type: Grant
    Filed: October 27, 1972
    Date of Patent: April 4, 1978
    Assignee: Xerox Corporation
    Inventors: Werner E. L. Haas, James E. Adams, Bela Mechlowitz
  • Patent number: 4076387
    Abstract: A magnetic display comprising, between two magnetic field permeable substrates, a ferrofluid and metal flakes, one of the substrates being provided with one or more selectively energizable electro-magnets.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: February 28, 1978
    Assignee: Xerox Corporation
    Inventors: Werner E. L. Haas, Gary A. Dir
  • Patent number: 4074276
    Abstract: A magnetic imaging system wherein a magnetizable recording member comprising a substrate overcoated with a magnetic recording layer of magnetic particles dispersed in a binder is exposed to high energy light pulses of sufficient energy effective to cause or allow the removal of said magnetic recording layer in exposed regions thereof. Imagewise configured high energy light pulses result in the removal of imagewise configured portions of the magnetic recording layer. Removal of portions of the magnetic recording layer can occur either before or after magnetization of the magnetizable recording member and upon development with magnetic toner, a complementary magnetic toner image is formed and can be transferred to a receiving medium to form hard copy. The system is particularly applicable to the formation of a magnetic master which is used to form the same magnetic toner image numerous times.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: February 14, 1978
    Assignee: Xerox Corporation
    Inventors: Werner E. L. Haas, Eugene C. Faucz
  • Patent number: 4071396
    Abstract: The nonstoichiometry of a crystalline member is altered by promoting conditions of vapor phase equilibrium between the member and a slotted crucible in which it is placed. The slotted crucible comprises material sharing a common vapor species with the crystalline member and provides an atmosphere of substantially constant thermodynamic activity with respect to the shared vapor phase upon isothermal heating of the member and crucible. In one embodiment, by achieving a partial vapor phase equilibration between a transparent crystalline member and such a crucible both the magnitude and profile of the refractive index of the member near its surfaces is modified in a controlled member.
    Type: Grant
    Filed: October 8, 1976
    Date of Patent: January 31, 1978
    Assignee: Xerox Corporation
    Inventor: Robert L. Holman
  • Patent number: 4071323
    Abstract: A slotted crucible for altering the nonstoichiometry of a crystalline member by promoting conditions of vapor phase equilibrium between the member and the slotted crucible in which it is placed. The slotted crucible comprises material sharing a common vapor species with the crystalline member and provides an atmosphere of substantially constant thermodynamic activity with respect to the shared vapor phase upon isothermal heating of the member and crucible.
    Type: Grant
    Filed: October 8, 1976
    Date of Patent: January 31, 1978
    Assignee: Xerox Corporation
    Inventor: Robert L. Holman
  • Patent number: 4067295
    Abstract: A magnetizable donor is magnetized to define a microfield with a characteristic spacing between pole centers of about 0.010 inches. The strong short range fields between poles pick up and hold a thin uniform and continuous layer of magnetic toner. The layer of toner is then electrostatically charged and brought into close proximity to a receptor, without touching the same, where only latent image areas of the receptor attract toner from the donor layer.
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: January 10, 1978
    Assignee: Xerox Corporation
    Inventors: Delmer G. Parker, Lawrence J. Fraser, Joseph L. Scaletta
  • Patent number: 4067018
    Abstract: Developed members having a magnetic latent image and comprising magnetic developer material in imagewise configuration corresponding to the latent image and additional magnetic developer material in background areas is rendered substantially free of excessive magnetic developing material by subjecting the member to an acceleration of magnitude sufficient to displace excessive developer material from said member in background and images areas but insufficient to adversely effect the optical density of the imagewise configured deposition of developer material. Preferably, the excessive developer material displaced from said member is removed from the vicinity of said member by application of air streams along the developed surface of said member.
    Type: Grant
    Filed: August 27, 1975
    Date of Patent: January 3, 1978
    Assignee: Xerox Corporation
    Inventor: Stephen F. Pond
  • Patent number: 4066335
    Abstract: A lens is fabricated with a layer of liquid crystalline material between electrodes, wherein the liquid crystalline composition is capable of altering the state of polarization of light when a voltage is applied between the electrodes. A linear polarizer and an analyzer are used in conjunction with the lens, and optionally are incorporated into the lens.
    Type: Grant
    Filed: January 19, 1976
    Date of Patent: January 3, 1978
    Assignee: Xerox Corporation
    Inventors: John E. Courtney, Charles J. Urso, Gary A. Dir