Patents Examined by Roland E. Martin, Jr.
  • Light transmission particle for forming color image
    Patent number: 4238562
    Abstract: Disclosed is a light transmission particle containing a colorless sublimable dye that is a spirobenzopyrane indole compound suitable for use in the formation of a color image. This particle can produce a clear color image having little fogging and having an excellent resolving power.
    Type: Grant
    Filed: July 27, 1978
    Date of Patent: December 9, 1980
    Assignees: Hodogaya Chemical Co., Ltd., Matsushita Electric Industrial Co., Ltd.
    Inventors: Eisuke Ishida, Yuji Takashima, Hisanori Nishiguchi, Yoshihide Miyazawa, Shigeru Endo
  • Electrophotographic printing system
    Patent number: 4234250
    Abstract: Reproductions of originals are obtained electro-photographically by exposing a charged photoconductor sequentially to at least two electro-optically regulated laser beam exposures, each exposure representing a separate color component of the original. Full color reproduction is possible.Alternatively a laser beam exposure may be accompanied, preferably substantially simultaneously, by exposures from either an opaque original or a transparency or both.
    Type: Grant
    Filed: July 15, 1977
    Date of Patent: November 18, 1980
    Assignee: Xerox Corporation
    Inventors: Louis D. Mailloux, William M. Reilich
  • Process for shaping a thermoplastic layer
    Patent number: 4233380
    Abstract: This invention relates to a process for shaping a recording produced on a material including a photoconductive, thermoplastic layer disposed on a carrier by electrostatic charging and exposure to light, which process comprises disposing the said material on a rigid base, at least one surface region of which is electrically conductive, and heating it.
    Type: Grant
    Filed: May 3, 1978
    Date of Patent: November 11, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Roland Moraw, Gunther Schadlich
  • Method and apparatus for liquid electrostatic development of charge images on a tape-like record carrier
    Patent number: 4233385
    Abstract: A method of liquid development of charge images formed on a surface of a tape-like record carrier, for example by an electrostatic printer. The record carrier is simultaneously sprayed with developer liquid in two flows which are directed towards each other. As a result, two separate, uniform and oppositely directed flow zones meeting at one common turbulent flow zone are obtained. Both during pre-development and final developement the charge images are brought into contact with a large quantity of fresh developer liquid.
    Type: Grant
    Filed: August 15, 1977
    Date of Patent: November 11, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Hans-Dieter Hinz, Ulf Rothgordt, Franz Schinke
  • Photosensitive paper for electrophotography with an electrically conductive coating of a fluorine resin
    Patent number: 4232101
    Abstract: A photosensitive paper for electrophotography comprising a paper substrate, an electrophotographic photosensitive layer formed on one surface of the substrate and an electrically conductive coating layer formed on the other surface of the substrate, which electrically conductive coating layer comprises an electrically conductive binder medium and a fine powder of a fluorine resin distributed predominantly in the surface portion of the electrically conductive coating layer, is disclosed.This photosensitive paper is satisfactory in all of the following properties; adaptability to the paper feeding operation, the scratch resistance of the photosensitive layer, the blocking resistance and electric characteristics irrespective of the humidity conditions in the operation atmosphere.
    Type: Grant
    Filed: June 27, 1978
    Date of Patent: November 4, 1980
    Assignee: Mita Industrial Company Ltd.
    Inventors: Hideo Fukuda, Hiroichi Morikawa, Yasutoki Kamezawa, Tatsuo Aizawa
  • Imaging system
    Patent number: 4232102
    Abstract: An imaging member comprising a layer of particulate photoconductive material dispersed in an organic resinous binder, said photoconductive material comprising trigonal selenium containing a mixture of an alkali metal selenite and an alkali metal carbonate. This layer can be the charge generation layer of an imaging member also having a charge transport layer in contact therewith.
    Type: Grant
    Filed: May 18, 1979
    Date of Patent: November 4, 1980
    Assignee: Xerox Corporation
    Inventors: Anthony M. Horgan, Richard W. Radler, Jr.
  • Substrates for use in screen photosensitive element
    Patent number: 4232104
    Abstract: The conductive substrate is formed so that the pore openings therein gradually expand in size from one side to the other side of the substrate. When the subtrate is operated with an insulating material from the side having the larger openings, the insulating material adheres to the inclined internal circumferential surface of the pores. When a conductive layer is formed by vacuum evaporation deposition on the insulating layer, there is no short-circuit formed between the conductive layer and the substrate due to the complete insulation of the substrate without diminishing the size of the pore openings. The ratio of the smaller width of the openings to the larger width and the ratio of the depth of the inclined portion of each micro-opening to the thickness of the substrate are respectively within the range of from 1/5 to 4/5.
    Type: Grant
    Filed: May 9, 1978
    Date of Patent: November 4, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Sohji Shinozaki, Yoshiaki Takei
  • Phenyl benzotriazole stabilized photosensitive device
    Patent number: 4232103
    Abstract: An imaging member comprising a hole generation layer and a contiguous hole transport layer, said generation layer comprising a photoconductive material exhibiting the capability of photogeneration of holes and injection of said holes, said hole transport layer comprising a transparent electrically inactive polycarbonate resinous material having dispersed therein from about 25 to about 75% by weight of the composition of one or more of the following diamines: ##STR1## and wherein X is independently selected from the group consisting of an alkyl group having from 1 to about 4 carbon atoms and chlorine in the ortho, meta or para position, said transport layer also containing a chlorine-containing organic solvent, and a stabilizing proportion of a substituted or unsubstituted 2-(2'-hydroxyphenyl)-benzotriazole.
    Type: Grant
    Filed: August 27, 1979
    Date of Patent: November 4, 1980
    Assignee: Xerox Corporation
    Inventors: William W. Limburg, Damodar M. Pai
  • Electrographic process of imaging by modulation of ions
    Patent number: 4230786
    Abstract: An electrographic process of producing, on a dielectric coated record medium, an electrostatic copy latent image by modulating a flow of corona ions with the aid of an electrostatic latent image which has been produced on a photoconductive photosensitive screen having a number of openings. The process is characterized by making a ratio K of a maximum surface potential V volts of the electrostatic copy latent image produced on the dielectric coated record medium to an intensity of the electric field E volts/mm established between the photoconductive photosensitive screen and the dielectric coated record medium, i.e. K=V/E smaller than about 0.18 for the purpose of preventing enlargement of dots of the copy picture image.
    Type: Grant
    Filed: September 8, 1978
    Date of Patent: October 28, 1980
    Assignee: Olympus Optical Company Limited
    Inventors: Masaji Nishikawa, Toshio Nakatsubo, Hiroshi Tsuda, Shigo Fujie, Masazi Kanamaru, Shosaku Koseki
  • Process and apparatus for electrophotography
    Patent number: 4230783
    Abstract: Process and apparatus for electrophotography are disclosed in which a photosensitive medium basically composed of an electrically conductive layer, a photoconductive layer and an insulating layer is used. The process comprises the steps of applying onto the surface of the photosensitive medium a uniform corona discharge with a predetermined polarity, exposing it to an original light image, applying to it a secondary corona discharge with a component of the opposite polarity to that of the primary uniform corona discharge simultaneously with or immediately after the image-wise exposure, uniformly exposing it to near infrared light almost simultaneously with the secondary corona discharge and subjecting it to a whole surface exposure with white light so as to form an electrostatic latent image corresponding to the original light image.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: October 28, 1980
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takao Aoki, Hidejiro Kadowaki, Naoki Iwami
  • Migration imaging system with meniscus development
    Patent number: 4230782
    Abstract: A migration imaging system wherein an imaging member comprising migration marking material contained in or contacting a softenable layer on a supporting substrate has a latent image formed thereon, and the latently imaged member is developed by passing it through one or more small meniscuses bonding at least in part a volume of liquid which is capable of changing the resistance of the softenable material, to migration of the migration marking material toward the substrate. Alternately, an imaged migration type imaging member, having marking material in a migrated image comfiguration and in a background configuration which is at least in part spaced apart in depth in the softenable layer from said image configuration, is further developed by the inventive system.
    Type: Grant
    Filed: May 15, 1978
    Date of Patent: October 28, 1980
    Assignee: Xerox Corporation
    Inventor: William L. Goffe
  • Device for automatically replenishing toner to dry-type developing apparatus for electrophotography
    Patent number: 4230070
    Abstract: In a dry-type developing apparatus for use in electrophotography including a developing sleeve for conveying a two-component developer composed of a toner and a carrier to a developing station, an automatic toner replenishing device comprises a roller to which voltage is applied having recessed toner dispenser portions and a toner recovering peripheral surface portion on its periphery and rotatable in contact with a portion of the developer on the sleeve after the developer portion has passed through the developing station, bias voltage sources connected to the sleeve and to the roller respectively to produce a potential difference between the sleeve and the roller, and a toner tank arranged to cover part of the roller and containing the toner to be replenished.
    Type: Grant
    Filed: August 16, 1978
    Date of Patent: October 28, 1980
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hiroshi Murasaki, Masaya Ogawa, Hidetoshi Kawabata
  • Magnetic toner for developing latent electrostatic images and a process for the preparation thereof
    Patent number: 4230787
    Abstract: A one-component developer for developing a latent electrostatic image which comprises magnetic particles, thermoplastic resins and electric charge controlling dyestuffs as main components and in which the magnetic particles are substantially coated with the electric charge controlling dyestuffs. The resulting toner forms no fringe or ghost and has good duplicativity of halftone images. The toner is made by coating the magnetic particles with the electric charge controlling dyestuffs before mixing the magnetic particles with the resin.
    Type: Grant
    Filed: August 8, 1977
    Date of Patent: October 28, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Shotaro Watanabe, Katsutoshi Tozawa, Shigeru Uetake
  • Electrophotography with uniform exposure for residual potential
    Patent number: 4229511
    Abstract: The present invention provides an electrophotographic process for producing copied images by repeating the respective steps of at least charging a layered photoconductor having a carrier generation layer and a carrier transport layer, in that order, on a light-transmissible electroconductive support, effecting image-wise exposure by way of one side of said layered photoconductor and developing subsequent thereto, in which the occurrence of stains on the ground of the image is minimized by uniformly applying light in an amount of exposure sufficient for substantially eliminating the residual potential resulting from said image-wise exposure by way of the other side of the layered photoconductor either simultaneously with the image-wise exposure or in the course of from the image-wise exposure to the development.
    Type: Grant
    Filed: October 17, 1978
    Date of Patent: October 21, 1980
    Assignee: Ricoh Company, Ltd.
    Inventor: Tatuya Katoh
  • Liquid electrographic developers containing polymeric quaternary salts
    Patent number: 4229513
    Abstract: A negatively charged liquid electrographic developer comprising an electrically insulating carrier liquid such as a paraffinic hydrocarbon fraction, having stably dispersed therein (a) a halogenated polymer, such as chlorinated polyethylene, and having dissolved therein (b) a copolymer of a quaternary ammonium salt monomer and a solubilizing monomer and (c) a copolymer of a polar monomer and a solubilizing monomer.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: October 21, 1980
    Assignee: Eastman Kodak Company
    Inventors: Stewart H. Merrill, Alec N. Mutz, Frederick A. Stahly
  • Photoconductive polymer material of N-alkylphenothiazine and formaldehyde
    Patent number: 4229510
    Abstract: A photoconductive polymer material having the following repeating unit: ##STR1## wherein R represents an alkyl group is disclosed.
    Type: Grant
    Filed: April 26, 1979
    Date of Patent: October 21, 1980
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Syu Watarai, Kenichi Sawada, Takeshi Saida
  • Color electrophotographic process, apparatus and recording element useful therein
    Patent number: 4228231
    Abstract: A subtractive color electrophotographic process is disclosed for producing a multicolor print from a single exposure of a color original. The process utilizes a novel multilayer recording element containing an electrically conducting layer, an insulating layer and two or more photoconductive layers, each spectrally sensitized to a different portion of the optical spectrum. In carrying out the process, the recording element is first uniformly charged and exposed to a color original and then developed by a multistep procedure. Each step of the development procedure comprises flood exposing the recording element to radiation to which at least one of the photoconductive layers is responsive while applying toner particles having a different subtractive color characteristic and an appropriate electrical bias.
    Type: Grant
    Filed: October 31, 1977
    Date of Patent: October 14, 1980
    Assignee: Eastman Kodak Company
    Inventors: Joseph Y. Kaukeinen, Ernest W. Turnblom
  • Flexible multi-layer photoreceptor of electrophotography
    Patent number: 4226929
    Abstract: A photoreceptor of electrophotography having a flexibility and a sensitivity to electromagnetic wavelengths of a wide range extending as far as the red color region of the spectrum of light rays is produced by forming a layer of a halogen-doped Se-S alloy on a substrate and further forming on said layer a halogen-doped Se-Te alloy layer. The Se-S alloy contains sulfur in a weight ratio of 0.1 to 0.35 to the Se-S alloy. The Se-Te alloy contains tellurium in a weight ratio of 0.05 to 0.35 to the Se-Te alloy.
    Type: Grant
    Filed: November 7, 1978
    Date of Patent: October 7, 1980
    Assignee: Stanley Electric Co., Ltd.
    Inventors: Toru Teshima, Hiroshi Nozaki, Minoru Koyama, Kazuhisa Katoh
  • Electrophotographic recording material with cellulose acyl ester binder
    Patent number: 4224395
    Abstract: This invention relates to an improvement in an electrophotographic recording material comprising an electrically conductive support, optionally an insulating intermediate layer, and a photoconductive layer composed of at least one layer comprising charge carrier-producing and charge transporting compounds, a binder, and conventional additives, the improvement that the recording material comprises a 75 to 250 .mu.m thick support and, in the form of a photoconductor web, is sufficiently flexible that it is not prone to the formation of hairline cracks when repeatedly conducted over rollers of at least 18 mm diameter, said binder being a cellulose acyl ester with an acetyl content of not more than 30 percent and a viscosity of more than 15 poises, measured by the ASTM methods D 817-65, Formula A, and D 1343-56.
    Type: Grant
    Filed: July 27, 1978
    Date of Patent: September 23, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Wolfgang Wiedemann
  • Electrostatic process using liquid developer comprising polymeric phosphonate dispersant
    Patent number: 4223086
    Abstract: Liquid developers for electrography are provided containing soluble polymeric dispersing agents that comprise a phosphonate moiety. The phosphonate moiety comprises a phosphonic acid group, a half-ester of a phosphonic acid group, or a salt of either of these groups.
    Type: Grant
    Filed: April 27, 1979
    Date of Patent: September 16, 1980
    Assignee: Eastman Kodak Company
    Inventors: Stewart H. Merrill, Domenic Santilli