Patents by Inventor Lawrence J. Fraser

Lawrence J. Fraser 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).

  • Patent number: 4935788
    Abstract: A multicolor printing system of the type in which a plurality of latent images are recorded therein. Each one of the plurality of latent images are developed with a different color liquid developer material to form a plurality of different color liquid images. The different color liquid images are transferred, in superimposed registration with one another, to an intermediate member to form a multicolor liquid image thereon. Thereafter, the multicolor liquid image is, in turn, transferred to a sheet and fused thereto.
    Type: Grant
    Filed: June 16, 1988
    Date of Patent: June 19, 1990
    Assignee: Xerox Corporation
    Inventors: Joseph Fantuzzo, Lawrence J. Fraser, Edwin R. Monkelbaan, Thomas Robson
  • Patent number: 4346985
    Abstract: An automatic development control for use in an electrophotographic apparatus. The control includes a pair of substantially planar members forming a channel therebetween through which developer flows. One of the members is constructed such that an electrostatic charge pattern is periodically formed on the surface thereof, the charge pattern being developed by the attraction of toner thereto which toner has a charge opposite to that forming the charge pattern. The member on which the developed charge pattern is formed includes a uniform, transparent conducting substrate covered with a transparent insulating layer on top of which is deposited a set of spaced-apart, opaque and electrically conducting fingers. Thus, the one member includes alternate opaque and transparent areas.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: August 31, 1982
    Assignee: Xerox Corporation
    Inventors: P. Keith Watson, Lawrence J. Fraser
  • Patent number: 4113371
    Abstract: A development apparatus in which a plurality of differently colored particles are dispensed into a common sump. Differently colored particles are dispensed in a pre-selected ratio to form a resultant mixture of particles in the sump having a pre-selected color. This mixture is subsequently deposited on a latent image rendering the image visible in the pre-selected color.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: September 12, 1978
    Assignee: Xerox Corporation
    Inventors: Lawrence J. Fraser, Alan Liebman
  • Patent number: 4087168
    Abstract: A xerographic system, particularly color, is disclosed. To offset the side effects of the relatively high bias potentials applied to the magnetic brush developer roll or rolls and the tendency thereof to create fields adverse to edge and fringe development, a field sensitive corona generating device is provided to raise potentials of the image background areas after exposure but before development.
    Type: Grant
    Filed: January 19, 1976
    Date of Patent: May 2, 1978
    Assignee: Xerox Corporation
    Inventor: Lawrence J. Fraser
  • 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
  • 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: 4034709
    Abstract: An apparatus which renders a latent image visible by depositing developer material thereon. The apparatus includes a tubular member having a styrene-butadiene layer coated on a nonmagnetic roll. Magnets are disposed interiorly of the tubular member to attract the developer material thereto. The developer material is transported into contact with the latent image to produce a powder image thereon.
    Type: Grant
    Filed: October 22, 1975
    Date of Patent: July 12, 1977
    Assignee: Xerox Corporation
    Inventors: Lawrence J. Fraser, Delmer G. Parker, Joseph L. Scaletta
  • Patent number: 4000944
    Abstract: An electrostatic type copying or reproduction machine incorporating, as an integral, part of the machine photoconductive member, a signal generating electrode for use in controlling one or more of the machine processing parameters.
    Type: Grant
    Filed: February 18, 1975
    Date of Patent: January 4, 1977
    Assignee: Xerox Corporation
    Inventor: Lawrence J. Fraser
  • Patent number: 3950089
    Abstract: To realize the advantages which sometimes attach to the use of electrically conductive carrier particles, the electrodes within development systems and cleaning systems for electrostatographic processors, such as xerographic copiers and duplicators, are coated or otherwise held in intimate contact with a sufficiently thick layer of material having a resistivity which is selected to prevent carrier caused short circuit events from producing irreversible damage and to localize the effects of such events. As a general rule, a 1-25 mil thick layer of a material having a resistivity in the range of 10.sup.7 - 10.sup.9 ohm.sup.. cm is adequate for that purpose.
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: April 13, 1976
    Assignee: Xerox Corporation
    Inventors: Lawrence J. Fraser, Delmer G. Parker, Joseph L. Scaletta