Patents Examined by Roland Martin
  • Patent number: 6210853
    Abstract: A process for the preparation of toner including (i) gerating by emulsion polymerization in the presence of an initiator a first resin latex emulsion; (ii) generating by polycondensation a second resin latex optionally in the presence of a catalyst; (iib) dispersing the resin of (ii) in water; (iii) mixing (iib) with a colorant thereby providing a colorant dispersion; (iiib) mixing the resin latex emulsion of (i) with the resin/colorant mixture of (iii) to provide a blend of a resin and colorant; (iv) adding an aqueous inorganic cationic coagulant solution of a polymeric metal salt and optionally an organic cationic coagulant to the resin/colorant blend of (iiib); (v) heating at a temperature of from about 5 to about 10 degrees Centigrade below the resin Tg of (i), to thereby form aggregate particles and which particles are optionally at a pH of from about 2 to about 3.5; (vi) adjusting the pH of (v) to about 6.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: April 3, 2001
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Emily L. Moore, Guerino G. Sacripante
  • Patent number: 6210851
    Abstract: An electrostatographic toner comprising toner particles that have been surface treated with a solvent and silica particles having a BET surface area of 40 to 400 m2/g; wherein the solvent is selected from aliphatic alcohols, diols and triols, aliphatic ketones, aliphatic esters, cyclic ethers and aliphatic ethers.
    Type: Grant
    Filed: December 1, 1999
    Date of Patent: April 3, 2001
    Assignee: Eastman Kodak Company
    Inventors: Satyanarayan A. Srinivasan, Peter S. Alexandrovich
  • Patent number: 6210852
    Abstract: A toner for development of an electrostatically charged image including a binder resin, a function imparting agent, a colorant and a charge control agent, wherein said binder resin contains an olefin polymer having a cyclic structure, and a combination of two or more waxes having different melting points in the range of 80 to 140° C. is used as said function imparting agent. A toner for electrostatically charged image developing copiers and printers which has a broad offset-free temperature range and can attain a satisfactory fixability even in the high-speed copying can be provided.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: April 3, 2001
    Assignee: Ticona GmbH
    Inventor: Toru Nakamura
  • Patent number: 6210849
    Abstract: A color toner used in a color image forming apparatus that fixes a toner image onto a recording medium by flashlight is provided. A toner image formed from this color toner can be fixed by smaller light energy. This color toner includes binder resin, infrared ray absorption agent, colorant, and a compound expressed by a formula: wherein R represents an alkyl group having 4 to 200 carbon atoms.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: April 3, 2001
    Assignee: Fujitsu Limited
    Inventors: Makoto Fukuda, Norio Sawatari
  • Patent number: 6207334
    Abstract: An electrophotographic imaging member including a substrate, a charge generating layer, a charge transport layer, and an overcoat layer including a polyvinyl butyral film forming binder, a cross linked polyamide film forming binder, and a hole transport material. A process for forming an overcoated imaging member is also disclosed.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: March 27, 2001
    Assignee: Xerox Corporation
    Inventors: Kenny-tuan T. Dinh, Timothy J. Fuller, Markus R. Silvestri, Paul J. Defeo, Damodar M. Pai, John F. Yanus, Robert W. Nolley
  • Patent number: 6203958
    Abstract: Provided is a toner having good offset resistance and capable of giving non-glaring, high-quality images with high OHP transparency, and a method of image formation with it. The toner includes at least a binder resin, a colorant and a wax. The THF soluble component of the toner, as analyzed through gel permeation chromatography, has a number-average molecular weight falling between 2500 and 5500, a weight-average molecular weight falling between 13000 and 25000, and a peak molecular weight falling between 5000 and 15000, and contains a fraction having a molecular weight of at least 105 in a ratio of at most 10% by weight of the component and a fraction having a molecular weight of at least 104 in a ratio of from 30 to 70% by weight of the component, and the wax in the toner has a DSC endothermic peak falling between 50 and 120° C.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: March 20, 2001
    Assignee: Fuji Xerox Co., LTD
    Inventors: Yasuhiro Oya, Susumu Yoshino, Masanobu Ninomiya, Hirokazu Hamano, Kaori Oishi, Tetsuya Taguchi, Koutarou Yoshihara
  • Patent number: 6203961
    Abstract: A reverse charging printing liquid developer comprised of a nonpolar liquid, and dispersed therein a toner comprised of a sulfonated polyester resin and a colorant.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: March 20, 2001
    Assignee: Xerox Corporation
    Inventors: David H. Pan, Guerino G. Sacripante
  • Patent number: 6203955
    Abstract: A developing agent containing a binder resin, a magnetic particle, rutile/anatase mixed crystal type titanium oxide treated to have hydrophobicity, and silica treated to have hydrophobicity is used.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: March 20, 2001
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventor: Takahiro Mochizuki
  • Patent number: 6205307
    Abstract: An image-forming apparatus of an electrophotographic system equipped with an electrophotographic photoreceptor, an electrostatically charger, a light-exposure, a developing device, and a transferring device, wherein the electrophotographic photoreceptor is an electrophotographic photoreceptor having at least a charge generating layer, a charge transport layer, and an uppermost surface layer successively laminated on an electrically conductive substrate, the charge transport layer having a layer containing at least 45% by weight a charge transporting material, and the wear rate of the uppermost surface layer being less than the wear rate of said layer, and the time from a light-exposure to a development is not longer than 150 m sec. The image-forming apparatus is excellent in the printing durability and the stability, gives less image flowing, and is small-sized and high-speed.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: March 20, 2001
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsumi Nukada, Wataru Yamada, Kiyokazu Mashimo
  • Patent number: 6203960
    Abstract: A toner composition including a binder, colorant, and a toner particle surface additive component comprised of a fumed silica coated with a first major amount of an alkylsilane compound and a second minor amount of an aminoalkylsilane compound, wherein the fumed silica has a relatively large particle size of, for example, a primary particle size diameter determined by BET measurement of from about 25 to about 75 nanometers an aggregate particle size of from about 225 nanometers to about 400 nanometers. A toner composition including a binder, colorant, and a toner particle surface additive component comprised of a mixture of first coated fumed silica coated with an alkylsilane compound and a second coated fumed silica coated with an aminoalkylsilane compound wherein the first and second fumed silicas each has the same relatively large particle size.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: March 20, 2001
    Assignee: Xerox Corporation
    Inventors: Roger N. Ciccarelli, Denise R. Bayley, Thomas R. Pickering
  • Patent number: 6203956
    Abstract: An electrophotographic toner containing a binder resin and a colorant, wherein at the angular frequency of 1 rad/sec and 30° C., a storage elastic modulus (G′30) is at least 1×105 Pa and a loss elastic modulus (G″30) is at least 1×105 Pa; a melting point is in the temperature region of 45 and 110° C.; when a common logarithm of G′ is plotted against the temperature and G′ at melting point +20° C. is represented by G′ (Tm+20) and G′ at melting point +50° C. is represented by G′ (Tm+50) the condition of the following formula (1) is satisfied |logG′(Tm+20)−logG′(Tm+50)|≦1.5  (1); and when a common logarithm of G″ is plotted against the temperature and G″ at melting point +20° C. is represented by G″ (Tm+20) and G″ at melting point +50° C.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: March 20, 2001
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Chisato Urano, Katsumi Daimon, Masato Mikami, Norihito Fukushima
  • Patent number: 6203953
    Abstract: A method to form a seven-color CMYKRGB or eight-color CMYKRGBW image having reduced toner pile height than in conventional four-color xerography, resulting in more uniform image gloss. The method includes the steps of: forming first spot next to spot toner images by placing spots of toner of a first color next to spots of toner of a second color on a first photoconductive member; forming second spot next to spot toner images by placing spots of toner of a third color next to spots of toner of a four color a second photoconductive member, and transferring said first and second spot next to spot images to form a composite spot next to spot image on an intermediate imaging member.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: March 20, 2001
    Assignee: Xerox Corporation
    Inventor: Edul N. Dalal
  • Patent number: 6200719
    Abstract: A toner containing toner particles has a particular weight-average particle diameter, containing therein toner particles with another particle diameter in a predetermined number percentage of the number of the toner particles. A releasing agent contained in the toner particles has a particular endotherm ratio (Q/q), that is measured, using a differential scanning calorimeter (DSC), wherein q is the endotherm (&mgr;V·min/mg) of the releasing agent contained in predetermined classified and sampled toner particles, assessed per unit amount of the sampled toner particles, and Q is the endotherm (&mgr;V·min/mg) of the releasing agent contained in the toner particles of the toner in its entirety, assessed per unit amount of the toner particles. A method of producing the toner, and a method of forming images, using the toner, and a toner container or cartridge containing therein the toner are disclosed.
    Type: Grant
    Filed: April 7, 2000
    Date of Patent: March 13, 2001
    Assignee: Ricoh Company, Ltd.
    Inventor: Noboru Kuroda
  • Patent number: 6200717
    Abstract: In a electrophotographic photoconductor having a single layer type photosensitive layer 3 laminated directly or through an undercoat layer 2 on an electroconductive substrate 1, the single layer type photosensitive layer 3 contains at least a resin binder, a charge generating substance, a hole transfer substance and an electron transfer substance, wherein the hole transfer substance is a compound represented by the general formula (HT1) shown below and an electrophotographic apparatus comprise this photoconductor. This electrophotographic photoconductor has good electric property in positive charge and good stability in repeated use.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: March 13, 2001
    Assignee: Fuji Electric Imaging Device Co., Ltd.
    Inventors: Masaru Takeuchi, Kenichi Ohkura, Shinichi Omokawa
  • Patent number: 6197461
    Abstract: Multiple-seam electrostatographic imaging member belts include two or more imaging member portions joined together by two or more seams. The belts can be formed from imaging member web that either includes or does not include an anti-curl backing layer, and that includes a charge transport layer that is substantially stress free.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: March 6, 2001
    Assignee: Xerox Corporation
    Inventors: Robert S. Foltz, Richard P. Millonzi, Robert C. U. Yu, John J. Darcy, Edouard E. Langlois
  • Patent number: 6194118
    Abstract: A color toner comprises a binder resin, a coloring agent, a release agent and a charge controlling agent, wherein the release agent dispersed in the binder resin has an average particle diameter of from about 0.1 to about 2 &mgr;m and wherein a fixed color toner image, which is developed and fixed using the toner, has a Haze factor less than about 20% when the image has an image density of 1.5. The color toner produces images having good image qualities such as good color reproducibility.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: February 27, 2001
    Assignee: Ricoh Company Ltd.
    Inventors: Satoru Miyamoto, Nobutaka Kinoshita, Hiroshi Yaguchi
  • Patent number: 6194115
    Abstract: The invention in this application relates to a toner composition for electrostatic latent image development which is characterized in that, in a toner composition comprising at least binder resin, colorant and charge control agent, to be used in a print forming method provided with a print fixing device which fixes the toner image on a recording medium by means of a light flash, the concentration of benzene generated by heating for 90 seconds at 330° C. is no more than 60 &mgr;g/g, and the invention provides a toner composition for electrostatic latent image development which either extends the filter life or does not require the use of a filter.
    Type: Grant
    Filed: August 5, 1999
    Date of Patent: February 27, 2001
    Assignee: Toray Industries, Inc.
    Inventors: Kimikazu Nagase, Masaaki Ishiyama, Takashi Taira, Hiroyuki Takahata, Kousuke Yotsuduka, Shigehiro Hano, Yoshihiro Chujo
  • Patent number: 6194106
    Abstract: This invention discloses novel surface release layers on temporary image receptors particularly suited to the requirements of liquid electrographic (both electrophotographic and electrostatic) printing on a variety of receptors. The inventive temporary image receptors are comprised of a surface release layer on a photoreceptive or dielectric substrate. The release layers are silicone copolymers which are chemically modified to improve imaging, drying or transfer performance when used in the simplified color electrophotography (SCE) or electrostatic printing processes.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: February 27, 2001
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kathryn R. Bretscher, Terri L. Butler, Mark C. Berens, James A. Baker, Gay L. Herman, Larry D. Boardman, Gaye K. Lehman
  • Patent number: 6194110
    Abstract: A photoconductive imaging member containing a photogenerating layer comprised of a mixture of perylenes, wherein the mixture comprises, for example, (1) 1,3-bis(n-pentylimidoperyleneimido) propane (Formula A), 1,3-bis(2-methylbutylimido peryleneimido)propane (Formula B) and 1-(n-pentylimidoperyleneimido)-3-(2-methylbutylimidoperyleneimido)-propane (Formula C), and (2) an electron acceptor component Formula A 1,3-bis(n-pentylimidoperyleneimido)propane Formula B 1,3-bis(2-methylbutylimidoperyleneimido)propane Formula C 1-(n-pentylimidoperyleneimido)-3-(2-methylbutylimidoperyleneimido)propane
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: February 27, 2001
    Assignee: Xerox Corporation
    Inventors: Cheng-Kuo Hsiao, Ah-Mee Hor, Giuseppa Baranyi, H. Bruce Goodbrand
  • Patent number: 6190812
    Abstract: The present invention provides a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive substrate, wherein the photosensitive layer contains a phthalocyanine compound as an electric charge generating material, a hole transferring material and an electron transferring material in a binder resin, and that a difference in absolute value between a plus polarity sensitivity and a minus polarity sensitivity measured under the conditions of an exposure wavelength of 780 nm and an exposure energy of 1.0 &mgr;J/cm2 is not more than 500 V, and a reversal development type digital image forming apparatus using the electrophotosensitive material, which does not include a charge neutralizing step.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: February 20, 2001
    Assignee: Kyocera Mita Corporation
    Inventors: Yukikatsu Imanaka, Hiroaki Iwasaki, Yuji Tanaka, Masakatsu Hayashi