Patents Examined by John D. Welsh
  • Patent number: 4710446
    Abstract: A photosensitive recording material, in particular for the production of lithographic printing plates or resist images, possesses a photosensitive, photopolymerizable or electrophotographic recording layer which can be washed out with an aqueous, in particular aqueous alkaline, medium, the said recording layer containing, as a polymeric binder, a copolymer which is soluble or dispersible in the aqueous, in particular aqueous alkaline, medium and which contains, as a comonomer, an anhydride of a polymerizable, ethylenically unsaturated monocarboxylic acid in an amount of from 0.05 to 2% by weight, based on the copolymer, as copolymerized units.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: December 1, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerhard Hoffmann, Reiner Hofmann, Albert Elzer
  • Patent number: 4666810
    Abstract: An electrophotographic photosensitive member comprises a photosensitive layer containing an azo pigment selected from the general formulae (1) to (6).
    Type: Grant
    Filed: April 15, 1986
    Date of Patent: May 19, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shoji Umehara, Masakazu Matsumoto, Takao Takiguchi, Masataka Yamashita, Shozo Ishikawa
  • Patent number: 4666813
    Abstract: A developer for developing electrostatic latent images, comprising toner particles and particles of a fluorine-containing substance as represented by a vinylidene fluoride polymer having a specific randomness in molecular structure or crystalline structure. The randomness of the vinylidene fluoride polymer is defined by the absorption peak ratio in the F.sup.19 nuclear magnetic resonance spectrum in acetone or by the absolute .beta.-crystal content of the vinylidene fluoride polymer. The vinylidene fluoride polymer provides a friction reducing characteristic to the developer while retaining good developing characteristic under various conditions.
    Type: Grant
    Filed: January 3, 1986
    Date of Patent: May 19, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kiichiro Sakashita
  • Patent number: 4666811
    Abstract: Disclosed are compounds of the formula ##STR1## wherein n is 1 or 2; R.sup.1 and R.sup.2 are alkyl or aralkyl; R.sup.3 is alkyl; when n is 1, R.sup.4 is alkyl, aralkyl, alkenyl, aralkenyl, aryl or a polyether radical having up to 10 ether groups; and when n is 2, R.sup.4 is alkylene, aralkylene, alkenylene, aralkenylene, arylene or a divalent polyether radical having up to 10 ether groups. The compounds are highly efficacious organic photoconductors for use in electrophotography, exhibiting improved pre-exposure fatigue resistance and blooming properties as compared with known photoconductors. Photoconductive elements containing these compounds are also described.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: May 19, 1987
    Assignee: James River Graphics, Inc.
    Inventors: Everett W. Bennett, Jan B. Suchy
  • Patent number: 4663259
    Abstract: An electrophotographic photosensitive member comprises a conductive substrate, a charge transport layer and a charge generation layer, wherein said charge generation layer is superposed on said charge transport layer, and said charge generation layer contains particles of a fluorine-containing resin. And, an image forming process comprising the repetition of an electrophotographic process uses said electrophotographic photosensitive member.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: May 5, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoto Fujimura, Kiyoshi Sakai, Masami Okunuki
  • Patent number: 4660503
    Abstract: An improvement in the method and apparatus for producing a multi-color electrophotographic image wherein an electrophotographic medium is mounted on a carrier therefor and is translated over a predetermined path so that the medium is first charged, then exposed to a first light-borne image and then toned. Thus, the unexposed portions of the image bearing charged region of the medium are toned, preferably by a liquid toner, to produce a first color visible image. The carrier is then returned to the first position to repeat the foregoing steps to charge the medium and to expose it to a second light-borne image and to tone the second image with a second toning element to produce a second color visible image. The improvement comprises the step of brushing the surface of the first toned image with a soft fibrous brush member after the first toning step and prior to the second charging step to remove material from the untoned portion of the medium without significantly altering the toned image.
    Type: Grant
    Filed: March 10, 1986
    Date of Patent: April 28, 1987
    Assignee: Eastman Kodak Company
    Inventor: Robert S. Jones
  • Patent number: 4658756
    Abstract: An image holding member having on its surface an insulating layer consisting principally of a hardenable resin, a lubricant, and polyvinyl butyral. The image holding member exhibits an excellent surface lubricating property, and hence durability and cleaning properties.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: April 21, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Ito, Tomohiro Kimura
  • Patent number: 4656966
    Abstract: A method and apparatus for developing an electrostatic latent image on an electrographic element with a liquid developer by contacting the liquid developer with a molecular sieve zeolite.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: April 14, 1987
    Assignee: Eastman Kodak Company
    Inventor: Robert A. Guistina
  • Patent number: 4657838
    Abstract: A triboelectrically chargeable composition for use in development of electrostatic latent images. The composition contains an organotin alkoxide compound having at least one alkoxy group directly connected to the Sn atom. The composition is embodied typically as a positively chargeable toner and also as a charge-imparting material for charging a toner.
    Type: Grant
    Filed: April 29, 1986
    Date of Patent: April 14, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Fukumoto, Katsuhiko Tanaka, Eiichi Imai
  • Patent number: 4657833
    Abstract: A photosensitive cathode is used to vary in three dimensions, the position, shape and density of a metallic interlayer formed in a preformed polymer film using an electrochemical deposition process.
    Type: Grant
    Filed: February 11, 1986
    Date of Patent: April 14, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Henry C. Hadley, Jr., Stephen Mazur
  • Patent number: 4645727
    Abstract: Disclosed is a toner composition comprised of resin particles and covalently bonded polymeric dye chromophores of the following formula: ##STR1## wherein A is selected from the group consisting of alkylene and arylene; B is selected from the group consisting of ##STR2## wherein R is an alkylene group, an arylene or polyether segment; D is selected from the group consisting of dioxyalkane or dioxyarene; x is a fraction number from 0.01 to about 0.50; and y is a fraction number of 0.50 to about 0.99, the sum of x and y being equal to 1.
    Type: Grant
    Filed: April 17, 1986
    Date of Patent: February 24, 1987
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij
  • Patent number: 4645729
    Abstract: A charged image on a photosensitive layer is developed with a toner containing a releasing agent and a hydroxycarboxylic acid complex salt to form a toner image. The toner image is then transferred to a receptor sheet and fixed to it. The use of a toner containing a specific hydroxycarboxylic acid complex salt brings about a marked advantage of widening a non-offset region to a higher temperature without impairing the antiblocking property, flowability and heat resistance of the toner.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: February 24, 1987
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Nobuyasu Honda, Masanori Fujii, Masahiko Kubo
  • Patent number: 4643960
    Abstract: A toner powder comprising a thermoplastic binder, a pigment, and a fatty acid amide containing at least about ten carbon atoms is provided. Addition of the amide has no deleterious effects upon the composition yet renders the toner readily processable.
    Type: Grant
    Filed: June 6, 1984
    Date of Patent: February 17, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Nancy N. Quan
  • Patent number: 4639403
    Abstract: An electrostatographic suspension developer contains a dispersed pigment and a copolymer ofA. cationic monomers which contain ammonium, phosphonium or sulfonium groups and of which the anions are derived from CH-acidic or sulfur- or phosphorus-containing acidic compounds containing at least one C.sub.6 -C.sub.24 hydrocarbon radical andB. radically polymerizable, olefinically unsaturated compounds as comonomersin an electrically insulating carrier liquid having a volume resistivity of at least 10.sup.9 ohm. cm and a dielectric constant below 3.
    Type: Grant
    Filed: July 5, 1985
    Date of Patent: January 27, 1987
    Assignee: Agfa Gevaert Aktiengesellschaft
    Inventors: Wolfgang Podszun, John Goossens, Carlhans Suling, Gunther Hoffarth, Wolfgang Richter, Herman Uytterhoeven, Walter de Winter
  • Patent number: 4639404
    Abstract: A liquid developer composition that is suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, dispersed coloring matter acting as toner particles and at least one anionic addition polymer comprising anionic groups neutralized with non-polymeric counter cations, characterized in that said cations are positively charged metal ion containing coordination compounds.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: January 27, 1987
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Herman J. Uytterhoeven, Walter F. De Winter, August M. Marien
  • Patent number: 4637973
    Abstract: In a process for forming an image comprising;(i) forming a latent image on a latent image bearing member comprising an organic photoconductive photosensitive member;(ii) forming a magnetic brush with a two-component developer comprising a toner and a carrier on a developer carrying member arranged as opposed to said latent image bearing member; and(iii) developing said latent image by brushing it with said magnetic brush in developing region;the improvement wherein said latent image bearing member and said developer carrying member move in the same direction in the developing region, and the ratio V.sub.S /V.sub.P of the linear velocity of said developer carrying member V.sub.S to the linear velocity of said latent image bearing member V.sub.P is within the range of 1.9.ltoreq.V.sub.S /V.sub.P .ltoreq.4.According to this process, an image which is free from fog, yet high in image density and stable for repeated copying can be obtained.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: January 20, 1987
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Kunio Shigeta, Yoko Yamamoto, Jiro Takahashi
  • Patent number: 4637974
    Abstract: A transparency to be imaged as a copy sheet in plain paper copiers includes a transparent sheet having a surface adapted to receive an image imprinted thereon in the copier, and an opaque coating forming an opaque border completely around the sheet.
    Type: Grant
    Filed: January 10, 1985
    Date of Patent: January 20, 1987
    Assignee: Weber Marking Systems, Inc.
    Inventor: Raymond G. Kubit
  • Patent number: 4636451
    Abstract: Pressure-fixable toner particles suitable for use in electrostatic copying machines and method of preparing same. The toner particle is spherical in shape and comprises a thin, substantially continuous surface layer of polyurea, and an interior portion comprising a matrix of polyurea, said matrix having a colorant and pressure-fixable material contained therein, said polyurea matrix forming a continium extending from the surface layer inwardly toward the center of said particle.
    Type: Grant
    Filed: February 13, 1986
    Date of Patent: January 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Josef Matkin, Richard J. Treleaven
  • Patent number: 4634649
    Abstract: Disclosed is a two-component developer composition enabling smudge resistant images which is comprised of improved two-component contamination free developer composition comprised of (1) magnetite; (2) a polyester resin comprised of the polymeric esterification product of a dicarboxylic acid and a diol comprising a diphenol of the following formula ##STR1## wherein R is selected from substituted and unsubstituted alkylene radicals of from about 2 to about 12 carbon atoms, alkylidene radicals of from 1 to 12 carbon atoms and cycloalkylidene radicals of from 3 to 12 carbon atoms; R' and R" are selected from substituted and unsubstituted alkylene radicals of from 2 to 12 carbon atoms, alkylene arylene radicals of from 8 to 12 carbon atoms and arylene radicals; X and X' are selected from hydrogen or any alkyl radical having from 1 to 4 carbon atoms; and each n is a number of from 0 (zero) to 4; and (3) carrier particles.
    Type: Grant
    Filed: March 20, 1985
    Date of Patent: January 6, 1987
    Assignee: Xerox Corporation
    Inventors: John F. Knapp, Robert J. Gruber
  • Patent number: RE32883
    Abstract: This invention is directed to a dry electrostatic toner composition containing a resin, a colorant or pigment, and an organic sulfate or sulfonate charge control additive of the following formula: ##STR1## wherein R.sub.1 is an alkyl radical containing from about 12 carbon atoms to about 22 carbon atoms, and preferably from about 14 carbon atoms to 18 carbon atoms, R.sub.2 and R.sub.3 are independently selected from alkyl groups containing from about 1 carbon atom to about 5 carbon atoms, R.sub.4 is an alkylene group containing from about 1 carbon atom to about 5 carbon atoms, R.sub.5 is a tolyl group or an alkyl group containing from about 1 carbon atom to about 3 carbon atoms and n is the number 3 or 4. Such toners, especially when combined with carrier materials, are useful for causing the development of images in an electrophotographic system.
    Type: Grant
    Filed: November 30, 1983
    Date of Patent: March 7, 1989
    Assignee: Xerox Corporation
    Inventor: Chin H. Lu