Electric Radiation Sensitive Pigment Patents (Class 430/37)
  • Patent number: 9152006
    Abstract: This invention relates to polymer particles, a process for their preparation, the use of these particles for the preparation of an electrophoretic device, electrophoretic displays comprising such particle, and new polymerisable dyes.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: October 6, 2015
    Assignee: Merck Patent GmbH
    Inventors: Louise Diane Farrand, Claire Topping, Anthony Lawrence
  • Publication number: 20130244149
    Abstract: The present invention is directed to a charged pigment particles useful for the electrophoretic fluid. The present invention describes how the charge property of the charged pigment particle may be controlled. By adjusting the charge property of the charged pigment particles to a suitable level for an electrophoretic display system, a faster switching speed, a higher contrast ratio and better image bistability may be achieved.
    Type: Application
    Filed: March 14, 2012
    Publication date: September 19, 2013
    Inventors: Ming WANG, Peter Laxton, Hui Du
  • Publication number: 20120229885
    Abstract: An electrophoretic display medium and preparing method thereof. The electrophoretic display medium comprises: negatively or positively-charged pigment particles; neutral pigment particles with colors different from the charged pigment particles; and low-polar and/or non-polar dispersing solvent. The method of preparing the electrophoretic display medium comprises: synthesizing neutral pigment particles; synthesizing charged pigment particles; and preparing electrophoretic display medium. The method of synthesizing the neutral pigment particles comprises: mixing together pigment particles, macromonomers, coupling-agents and chain-initiators for polymeric reaction in the solvent, and reacting at a temperature of 30-120° C. for 4-48 hours. The method is applied to many kinds of inorganic oxides, inorganic salts and complex inorganic salt pigments.
    Type: Application
    Filed: December 28, 2009
    Publication date: September 13, 2012
    Applicant: GUANGZHOU OED TECHNOLOGIES CO., LTD.
    Inventors: Yu Chen, Lei Zhang, Zuliang Liu, Xi Zeng, Songli Wei
  • Patent number: 7812813
    Abstract: A method and apparatus are provided for stamping a piece of ePaper. A grid is positioned within a selected distance to a first side of the piece of ePaper. A grounding pin conductively connects a conductive backing plate located on a second side of the piece of ePaper. The grounding pin completes a voltage path from the grid through the piece of ePaper to the conductive backing plate. A voltage is supplied to the grid and supplying the voltage to the grid changes the appearance of the piece of ePaper to form a stamped image.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: October 12, 2010
    Assignee: International Business Machines Corporation
    Inventor: Robert Thomas Cato
  • Patent number: 7667047
    Abstract: A colorant contains a crystal of a compound represented by the following formula (1): the crystal having a crystal form showing main peaks at interplanar spacings d of 3.45±0.5 ?, 3.63±0.5 ?, 4.23±0.5 ?, 6.65±0.5 ?, and 7.84±0.5 ? in powder X-ray diffraction pattern with CuK? radiation.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: February 23, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yuka Ito, Shinji Hasegawa, Minquan Tian, Miho Watanabe, Kazuhiko Hirokawa, Kazunori Anazawa, Tomoko Miyahara, Takashi Matsubara, Makoto Furuki
  • Publication number: 20100040966
    Abstract: This invention relates to improved electrophoretic dispersions and a method for improving the performance of an electrophoretic display. The invention also relates to a method of inducing or enhancing the threshold voltage of an electrophoretic dispersion.
    Type: Application
    Filed: May 22, 2009
    Publication date: February 18, 2010
    Inventors: Haiyan Gu, HongMei Zang, Jiunn Jye Hwang, Xin Weng, Jack Hou, Chih-Yuan Liao, Shih-Wei Ho, Rong-Chang Liang
  • Patent number: 7324264
    Abstract: This invention relates to a method of manufacturing micro-cell arrays. Such an array may find use in a number of applications such as, for example, a video display, electronic paper, and signage. The microcell arrays find particular use in electromodulating displays.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: January 29, 2008
    Assignee: Eastman Kodak Company
    Inventors: Peter T. Aylward, Thomas M. Smith, Leonard S. Gates, Daniel A. Slater
  • Patent number: 7298544
    Abstract: A method for patterning self-assembled colloidal photonic crystals and a method for fabricating three-dimensional photonic crystal waveguides having an inverted-opal structure using the patterning method. The patterning method includes depositing first and second conductive films separate from each other, on an area corresponding to a pattern of the self-assembled colloidal photonic crystals that are to be formed on a substrate and on another area except for the area corresponding to the pattern, respectively, and growing the photonic crystals on the substrate on which the first and second conductive films are deposited by dip-coating in a fluid containing colloidal particles while applying a DC voltage to the respective first and second conductive films. Various types of colloidal photonic crystals can be fabricated depending on the electrode pattern defined on the substrate.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: November 20, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Il-kwon Moon, Jong-ho Kim, Sang-hoon Shin, Suk-han Lee
  • Patent number: 7177067
    Abstract: A color electronic paper display device is provided which is easy to fabricate and can provide bright display. The color electronic paper display device includes a CF (Color Filter)-formed TFT (Thin Film Transistor) substrate in which a concave/convex layer is formed and reflecting electrode controlling TFTs and pixel electrode controlling TFTs are arranged on a glass substrate and reflecting electrodes are formed on the concave/convex layer and a colored layer made up of color filters each being for one color out of RGB (Red, Green, Blue) is formed, and each of comb-teeth shaped pixel electrodes is formed in a position corresponding to a color filter for one color, an EPD (Electrophoretic Display Device) film laminated onto an upper surface of the TFT substrate having a plurality of microcapsules making up electrophoretic elements spreading within the EPD film, and a facing substrate laminated onto an upper surface of the EPD film.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: February 13, 2007
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Michiaki Sakamoto
  • Patent number: 7114864
    Abstract: An electronic paper printer is provided that is capable of describing display patterns properly and definitely on rewritable electronic paper. An electronic paper printer 1 has a describing head 3 for describing display patterns on electronic paper 2 capable of having display patterns rewritten thereto and erased therefrom, using electrophoresis, an erasing head 4 for erasing display patterns described on the electronic paper 2, a drive mechanism (not shown) for driving the describing head 3 and the erasing head 4 so that they turn, and a conveyor mechanism (not shown) for conveying the electronic paper 2. The describing head 3 is configured by a pair of drums 31 and 32 supported so that they freely turn. The erasing head 4 is configured by a pair of drums 41 and 42 supported so that they freely turn.
    Type: Grant
    Filed: July 14, 2004
    Date of Patent: October 3, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Tatsuya Shimoda, Satoshi Inoue
  • Patent number: 7113323
    Abstract: The present invention is directed to a display device which comprises two layers of insulating substrate, at least the substrate on the viewing side is transparent, an array of display cells sandwiched between the two layers of substrate, a writing means, and optionally an erasing means to magnetically or electrically erase the image. The display cells are filled with a dispersion of magnetic particles which may be charged or non-charged. The display of the invention eliminates the use of the transparent conductor film, such as ITO, on the viewing side. Therefore, the displays of this invention are more cost effective, more flexible and durable and capable of higher image contrast ratio and higher reflectance in the Dmin area.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: September 26, 2006
    Assignee: SiPix Imaging, Inc.
    Inventors: Ching-Shon Ho, Jerry Chung, Paul Gendler, Rong-Chang Liang
  • Patent number: 6927892
    Abstract: The present invention is directed to a display device which comprises two layers of insulating substrate, at least the substrate on the viewing side is transparent, an array of display cells sandwiched between the two layers of substrate, a writing means, and optionally an erasing means to magnetically or electrically erase the image. The display cells are filled with a dispersion of magnetic particles which may be charged or non-charged. The display of the invention eliminates the use of the transparent conductor film, such as ITO, on the viewing side. Therefore, the displays of this invention are more cost effective, more flexible and durable and capable of higher image contrast ratio and higher reflectance in the Dmin area.
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: August 9, 2005
    Assignee: SiPix Imaging Inc.
    Inventors: Ching-Shon Ho, Jerry Chung, Paul Gendler, Rong-Chang Liang
  • Patent number: 6914713
    Abstract: The present invention is directed to an electro-magnetophoresis display having either the traditional up/down or dual switching mode. The display cells are filled with an electro-magnetophoretic dispersion comprising particles suspended in a solvent and the particles are both charged and magnetized. The display of the invention prevents undesired movement of the particles in the cells. The magnetic force generated by the magnetic layer(s) eliminates the need to provide cells with a threshold voltage high enough to avoid the cross talk and/or cross bias effects. In addition, the dual switching mode allows the particles to move in the up/down direction as well as the planar direction, thus providing a multicolor display of high color quality at very low cost.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: July 5, 2005
    Assignee: SiPix Imaging, Inc.
    Inventors: Jerry Chung, Rong-Chang Liang
  • Patent number: 6900789
    Abstract: Disclosed is a reversible image display medium which can be repeatedly used and can display high quality images, in which cells between the two substrates accommodate a dry developer containing at least two kinds of frictionally chargeable dry developing particles having different chargeable polarities and different optical reflection densities; images are displayed by forming an electrostatic latent image corresponding to the image to be formed on one of the two substrates to drive the developing particles in an electrostatic field based on the electrostatic latent image; a developer-facing surface of one of the substrates has a surface resistivity of at least 1×1012 ohm/square; a developer-facing surface of the opposite substrate has a surface resistivity from 1×106 ohm/square to 1×1012 ohm/square; a developer-facing surface of one of the substrates has a surface average median roughness Ra of 0.2 ?m to 0.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: May 31, 2005
    Assignee: Minolta Co., Ltd.
    Inventors: Masahiko Matsuura, Hiroshi Mizuno, Akihito Ikegawa, Masaharu Kanazawa, Keyaki Yogome, Takaji Kurita
  • Patent number: 6670981
    Abstract: A laser printing system for imaging using plain paper, rewritable media, or both. The rewritable media employs a molecular colorant. The rewritable media is brought into contact with an electrical charge deposited on the surface of a photoconductor drum or belt. Field generated cause the molecules of the colorant to change state to develop the desired text or print image.
    Type: Grant
    Filed: October 30, 2001
    Date of Patent: December 30, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Kent D. Vincent, R. Stanley Williams, Xiao-an Zhang
  • Patent number: 6577433
    Abstract: An electrophoretic display liquid composition for use in an electrophoretic display device that has a multiplicity of individual reservoirs, each containing the display liquid of two sets of particles dispersed in a transparent liquid system as well as at least one charge director dissolved or dispersed in the liquid system, or physically embedded on the surface of the particles or chemically bonded on the surface of the surface of the particles, the two sets of particles exhibiting different, contrasting color and different charging properties from each other. The charge director(s) is preferably a metal salicylate compound. The particles may be modified with charge controlling agents, and may also include a set of magnetic particles. The transparent liquid system may include two immiscible liquids having different densities with the sets of particles having densities in between the densities of the two immiscible liquids such that the particles rest at an interface between the two immiscible liquids.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: June 10, 2003
    Assignee: Xerox Corporation
    Inventors: Pinyen Lin, David H. Pan, Chieh-Min Cheng, Adam Bush
  • Patent number: 6194488
    Abstract: A method of making polymer-coated pigment particles, involving the steps of providing a plurality of pigment particles, each of which has an outer surface coated with a layer of material that operates as a nucleus for initiating polymerization on the outer surface of each of the pigment particles. The pigment particles are mixed with a reaction mixture containing a solvent and a monomer material, wherein the layer of material coating each of the pigment particles causes the monomer material to polymerize on the outer surface of substantially each of the pigment particles to form a polymer coating thereon.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: February 27, 2001
    Assignee: Copytele, Inc.
    Inventors: Jing Hong Chen, Frederic E. Schubert
  • Patent number: 6045955
    Abstract: A low cost, high speed, high resolution laser printer method and apparatus for re-writable media is presented. Three aspects are presented: 1) a bi-stable, microencapsulated colorant and surface coating therefore for producing an electric field writable and erasable medium--such as paper or a paper-like display, 2) an electrophotographic printer that is capable of conventional toner-based printing and re-writable "paper" printing and 3) a greatly simplified electrophotographic printer that is dedicated to printing re-writable media. The printer embodiments are based on conventional low cost laser printer designs, and have significant advantages in product cost, printing resolution and speed over the electrode array printer. A laser scanner is used to writably erase the uniform, high voltage charge deposited on the surface of a photoconductor drum or belt.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: April 4, 2000
    Assignee: Hewlett-Packard Company
    Inventor: Kent D. Vincent
  • Patent number: 5932633
    Abstract: A method of making polymer-coated pigment particles, involving the steps of providing a plurality of pigment particles, each of which has an outer surface coated with a layer of material that operates as a nucleus for initiating polymerization on the outer surface of each of the pigment particles. The pigment particles are mixed with a reaction mixture containing a solvent and a monomer material, wherein the layer of material coating each of the pigment particles causes the monomer material to polymerize on the outer surface of substantially each of the pigment particles to form a polymer coating thereon.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: August 3, 1999
    Assignee: Copytele, Inc.
    Inventors: Jing Hong Chen, Frederic E. Schubert
  • Patent number: 5866284
    Abstract: A low cost, high speed, high resolution laser printer method and apparatus for re-writable media is presented. Three aspects are presented: 1) a bi-stable, microencapsulated dichroic sphere colorant and surface coating therefore for producing an electric field writable and erasable medium--such as paper or a paper-like display, 2) an electrophotographic printer that is capable of conventional toner-based printing and re-writable "paper" printing and 3) a greatly simplified electrophotographic printer that is dedicated to printing re-writable media. The printer embodiments are based on conventional low cost laser printer designs, and have significant advantages in product cost, printing resolution and speed over the electrode array printer. A laser scanner is used to writably erase the uniform, high voltage charge deposited on the surface of a photoconductor drum or belt.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: February 2, 1999
    Assignee: Hewlett-Packard Company
    Inventor: Kent D. Vincent
  • Patent number: 5866637
    Abstract: There is provided by the present invention coating formulations and thermal transfer media that form printed images which are readable by magnetic ink character recognition (MICR) devices. These formulations and ribbons employ wax, binder resin and an organic molecule-based magnet. MICR readable printed images obtained therefrom are also provided as is a thermal printer which employs the ribbon.
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: February 2, 1999
    Assignee: NCR Corporation
    Inventor: Michael A. Lorenz
  • Patent number: 5629920
    Abstract: An information recording system including a photoelectric sensor having a semiconductive, photoconductive layer stacked on an electrode, and an information recording medium having an information recording layer stacked on an electrode so that information can be recorded on the information recording layer by an electric field or electric charge. The photoelectric sensor and the information recording medium are disposed to face each other, and information exposure is carried out with a voltage being applied between the two electrodes, thereby enabling information to be recorded on the information recording medium. The photoconductive layer of the photoelectric sensor is capable of amplifying an electric field or electric charge given to the information recording medium, so that the intensity of electric field or the amount of electric charge given to the information recording medium can be increased to a level higher than the light energy actually applied.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: May 13, 1997
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Shinichi Sakano, Daigo Aoki, Minoru Utsumi, Masanori Akada, Osamu Shimizu
  • Patent number: 5360689
    Abstract: A process for forming dielectric particles includes admixing a vinyl halide monomer and a crosslinker in a liquid dispersion medium to form a first mixture. A second mixture of an initiator and a stabilizer is prepared and added to the first mixture to form a third mixture in which the monomer polymerizes to form white crystalline polymer particles which are sonified for uniformity. The particles may be stained by exposure to a dehydrohalegenation reagent and dispersed in an electrophoretic fluid for use in an electrophoretic display.
    Type: Grant
    Filed: May 21, 1993
    Date of Patent: November 1, 1994
    Assignee: Copytele, Inc.
    Inventors: Wei-Hsin Hou, Thomas B. Lloyd, Frederic E. Schubert
  • Patent number: 5344594
    Abstract: A method of forming hemispheric bichromal balls, including the steps bringing together two streams of differently colored hardenable liquids for forming a single side-by-side bichromal stream, expelling said single side-by-side bichromal stream into a fluid as one or more free jets whose forward ends becomes unstable and break up into droplets which form into spherical balls, each of the balls comprising hemispheres of differently colored hardenable liquid, and finally hardening the balls.
    Type: Grant
    Filed: December 11, 1992
    Date of Patent: September 6, 1994
    Assignee: Xerox Corporation
    Inventor: Nicholas K. Sheridon
  • Patent number: 5322752
    Abstract: Disclosed is a process for generating images which comprises providing an original document with an image thereon, which image is developed with a composition comprised of resin particles, pigment particles, a low molecular weight wax component, and additive particles; and thereafter generating images therefrom; and wherein the original document subsequent to development is abrasion resistant.
    Type: Grant
    Filed: April 19, 1991
    Date of Patent: June 21, 1994
    Assignee: Xerox Corporation
    Inventor: Sally S. Gay
  • Patent number: 4634646
    Abstract: A method for the formation of images comprising: (1) feeding a photoconductive toner, having a particle diameter of on the average 6 .mu.m or less, to a conductive substrate to form a toner layer of 1 to 8 layers on said conductive substrate, (2) uniformly charging said toner layer, and (3) exposing said toner layer to form an electrostatic latent image thereon corresponding to the original.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: January 6, 1987
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Yumiko Sano, Teruyo Morimoto
  • Patent number: 4578330
    Abstract: An hydroxyaluminumphthalocyanine colorant compound with reduced green absorption having peak absorption bathochromically shifted to 621 nm is disclosed. In a preferred embodiment, hydroxyaluminumphthalocyanine of the invention exhibits reduced absorption on both sides of the 621-nm peak as determined by the peak width at half maximum intensity. Hydroxyaluminumphthalocyanine is useful as an electrically photosensitive component in photoelectrophoretic imaging processes, as well as in electrographic developers as a toner constituent.
    Type: Grant
    Filed: November 16, 1984
    Date of Patent: March 25, 1986
    Assignee: Eastman Kodak Company
    Inventors: Michael T. Regan, Hal E. Wright
  • Patent number: 4535046
    Abstract: A chloroaluminumphthalocyanine (CAP) colorant compound having peak absorption at about 640 nm and reduced absorption below the 640-nm peak are disclosed. CAP is useful as an electrically photosensitive compound in photoelectrophoretic imaging processes.
    Type: Grant
    Filed: June 30, 1983
    Date of Patent: August 13, 1985
    Assignee: Eastman Kodak Company
    Inventors: Henry V. Ksaacson, Hal E. Wright
  • Patent number: 4463076
    Abstract: Electrically photosensitive complex cyanine colorant compounds, each comprising two merocyanine moieties joined by a cyanine moiety, are useful in electrically photosensitive materials for photoelectrophoretic (PEP) imaging processes. These compounds are symmetric or asymmetric and contain the structure: ##STR1## wherein: m and n, which are the same or different, are 0, 1 or 2;t and u, which are the same or different, are 0 or 1;p is 0, 1 or 2;R.sup.1 and R.sup.11, which are the same or different, represent an alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic group or, when taken together and p is zero, are a one- or two-carbon alkylene bridge;R.sup.2 and R.sup.22, which are the same or different, represent an alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic group;R.sup.3 and R.sup.33, which are the same or different, represent hydrogen or an alkyl group;R.sup.4 and R.sup.44, which are the same or different, represent hydrogen or an alkyl group;R.sup.4, which when taken together with R.sup.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: July 31, 1984
    Assignee: Eastman Kodak Company
    Inventors: Steven G. Link, Frank G. Webster
  • Patent number: 4431721
    Abstract: A photoelectrophoretic imaging process, wherein a suspension of photosensitive pigment particles between two electrodes, at least one of which is transparent, is subjected to the influence of an electric field and exposed to an image, which process comprises using, as photosensitive pigment, a perylenetetracarboxylic acid diimide of the formula ##STR1## wherein R.sub.1 and R.sub.2 are aliphatic, cycloaliphatic, aromatic or heterocyclic radicals.The pigments used in this invention are distinguished by particularly good photoelectrophoretic sensitivity and low fog density.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: February 14, 1984
    Assignee: Ciba-Geigy Corporation
    Inventors: Max Jost, Werner Sieber
  • Patent number: 4427752
    Abstract: A photoelectrophoretic imaging process, wherein a suspension of photosensitive pigment particles between two electrodes, at least one of which is transparent, is subjected to the influence of an electric field and exposed to an image, which process comprises using, as photosensitive pigment, an isoindoline of the formula ##STR1## wherein R.sub.1 and R.sub.3 are cyano, --COOR or --CONHR', in which R is alkyl, cycloalkyl, aryl or a heterocyclic aromatic radical, and R' is hydrogen, alkyl, cycloalkyl, aryl or a heterocyclic aromatic radical, R.sub.2 and R.sub.4 are cyano, or wherein R.sub.3 and R.sub.4, together with the carbon atom linking them, form a heterocyclic 6-membered ring.The pigments used in this invention are distinguished by particularly good photoelectrophoretic sensitivity and low fog density.
    Type: Grant
    Filed: April 28, 1982
    Date of Patent: January 24, 1984
    Assignee: Ciba-Geigy Corporation
    Inventors: Jost von der Crone, Werner Sieber
  • Patent number: 4389474
    Abstract: A thiopyrylium compound having t-butyl groups at the 2- and 6-positions of the thiopyrylium nucleus, having a main absorption near the red region, i.e., 600 to 700 nm but substantially no side absorption near 400 nm, and useful as a sensitizer for a photoconductive composition.
    Type: Grant
    Filed: August 20, 1981
    Date of Patent: June 21, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kouichi Kawamura, Hideo Sato, Harumi Katsuyama
  • Patent number: 4361636
    Abstract: Novel polyesters comprising repeating units from:(a) a diacid derived component comprising a group selected from the class consisting of an alkali metal or ammonium -sulfoarylene, -sulfoaryloxyarylene, -sulfocycloalkylene, -iminodisulfonylarylene, -iminobis(sulfonylarylene) or -sulfoaralkylarylene; and(b) a diol or diacid derived component comprising a group selected from the class consisting of bis(N-alkyl-N-alkyleneaminoaryl)arylalkane; bis(N-alkyl-N-alkyleneaminoaryl)diarylalkane; bis(N-alkyl-N-alkyleneaminoaryl)isoalkane; bis(N-alkyl-N-alkyleneaminoaryl)cycloalkane; dialkyleneaminotetraarylalkane; bis(alkylenearyl)arylamine and alkylenetriarylamine;are useful in electrically photosensitive composite particles, materials, layers and photoelectrophoretic imaging methods.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: November 30, 1982
    Assignee: Eastman Kodak Company
    Inventors: Henry V. Isaacson, Michael T. Regan
  • Patent number: 4358521
    Abstract: Photoconductive compositions and electrophotographic photoreceptive materials are described containing a photo-conductive substance and a 5-nitrofurfural derivative represented by formula (1) ##STR1## wherein A represents atoms which form, together with the carbon atom, a moiety represented by one of formulae (2) to (10) ##STR2## wherein R represents a straight or branched chain alkyl group containing from 1 to 12 carbon atoms, X represents a group having a Hammett .sigma. value of at least 0.
    Type: Grant
    Filed: May 8, 1981
    Date of Patent: November 9, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Syunichi Kondo, Hirotsugu Nomaguchi, Hideo Sato
  • Patent number: 4331751
    Abstract: Electrically photosensitive materials and elements comprising an electrically photosensitive polymeric compound of the structure: ##STR1## wherein: R.sub.1 and R.sub.3, which are the same or different, represent a substituted or unsubstituted alkyl group having from 1 to 18 carbon atoms or a substituted or unsubstituted aryl group;R.sub.2 and R.sub.4, which are the same or different, represent a substituted or unsubstituted alkylene group having from 1 to 10 carbon atoms or a substituted or unsubstituted arylene group;R.sub.5 and R.sub.6, which are the same or different, represent hydrogen or an electron withdrawing group;R.sub.7 and R.sub.
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: May 25, 1982
    Assignee: Eastman Kodak Company
    Inventors: Henry V. Isaacson, Beth G. Wright, Hal E. Wright
  • Patent number: 4322487
    Abstract: The present invention provides novel composite electrically photosensitive particles. Each of said particle comprises a colorant and a polymeric binder comprising repeating units containing one or more structures selected from the classes consisting of triarylamines; p-aminotetraarylmethanes; 4,4'-bis(p-amino)triarylmethanes; 1,1-bis(p-aminoaryl)isobutanes; 1,1-bis(p-aminoaryl)cyclohexanes; N-alkyl-N,N-diarylamines; N,N-dialkyl-N-arylamines and heterocyclic nitrogen compounds having about 4 to 10 carbon atoms.
    Type: Grant
    Filed: August 8, 1979
    Date of Patent: March 30, 1982
    Assignee: Eastman Kodak Company
    Inventors: Stewart H. Merrill, Frederick A. Stahly, Ernest W. Turnblom, Beth G. Wright, Hal E. Wright
  • Patent number: 4314013
    Abstract: An improved photoelectrophorectic imaging process which comprises placing a suspension of double encapsulated electrically photosensitive particles in an electric field between a pair of surfaces, exposing the suspension to a pattern of electrogmagnetic radiation and separating the surfaces whereby the exposed portion of the suspension adheres to one surface and the unexposed portion adheres to the other surface. The imaging particles are comprised of a first resin which encapsulates a colorant for the particle and second resin which encapsulates the first resin and contains the electrically photosensitive material.
    Type: Grant
    Filed: April 4, 1979
    Date of Patent: February 2, 1982
    Assignee: Xerox Corporation
    Inventor: Yew C. Chang
  • Patent number: 4311775
    Abstract: Novel phthalocyanine pigments having the structure: ##STR1## wherein: R.sub.1 represents ##STR2## n represents 1, 2, 3 or any combination of 1, 2 and 3. R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent alkyl, alkylaryl, alkoxy, alkoxyaryl, cycloalkyl, aryl, aralkyl or aryloxy;R.sub.6 represents hydrogen or chlorine and AlPc represents ##STR3## are useful in electrographic developers and photoelectrophoretic imaging materials and processes.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: January 19, 1982
    Assignee: Eastman Kodak Company
    Inventor: Michael T. Regan
  • Patent number: 4304908
    Abstract: Disclosed are novel methine colorant materials having the structure ##STR1## Also disclosed is the use of such materials in electrophoretic migration imaging layers and processes.
    Type: Grant
    Filed: June 23, 1980
    Date of Patent: December 8, 1981
    Assignee: Eastman Kodak Company
    Inventors: Mark D. Frishberg, James J. Krutak, Sr.
  • Patent number: 4299894
    Abstract: Electrically photosensitive materials and elements comprising an electrically photosensitive compound of the structure: ##STR1## wherein: n represents zero, 1 or 2;Y represents 0 or S;Z represents 0 or NR in which R represents hydrogen, alkyl, aryl or aralkyl;R.sup.1, R.sup.2 and R.sup.3, which are the same or different, represent hydrogen, alkoxy, hydroxy, alkyl, aryl, alkylcarboxy or arylcarboxy; or R.sup.1 and R.sup.3 taken together with the carbon atoms to which they are attached provide sufficient atoms to complete a carbocyclic ring of 6-14 carbon atoms;R.sup.4 represents hydrogen or cyano; andA represents a nitrogen containing basic heterocyclic nucleus of the type used in cyanine dyes are useful in photoelectrophoretic imaging processes.
    Type: Grant
    Filed: June 23, 1980
    Date of Patent: November 10, 1981
    Assignee: Eastman Kodak Company
    Inventors: Thomas R. Klose, Frank G. Webster
  • Patent number: 4283475
    Abstract: 2,6-Di-tert-butyl-4-[5-(2,6-di-tert-butyl-4H-thiopyran-4-ylidene)penta-1,3- dienyl]thiopyrylium salts, which are novel, colorless, transparent, having an adsorption in the far infrared to near infrared region and capable of imparting high sensitivity to photoconductive substance; process for producing the salts; and a photoconductive composition containing the salt.
    Type: Grant
    Filed: August 20, 1980
    Date of Patent: August 11, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Koichi Kawamura, Harumi Katsuyama, Hideo Sato
  • Patent number: 4272596
    Abstract: An electrophoretic display device which provides high contrast images and a stable suspending fluid is described. A white marking material such as titanium dioxide is suspended in a colloidal dispersion containing black colorant such as colloidal size iron oxide particles known as ferrofluids. Image formation is achieved electrophoretically by selective application of an electric field across the imaging suspension.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: June 9, 1981
    Assignee: Xerox Corporation
    Inventors: John R. Harbour, Michael L. Hair
  • Patent number: 4272595
    Abstract: Electrophotosensitive materials having the structure ##STR1## wherein: M and N may be zero, one or two;L.sup.1, L.sup.2, L.sup.3, L.sup.4, L.sup.5, L.sup.6, and L.sup.7 may be cyano, hydrogen, substituted or unsubstituted alkyl, alkoxy, aralkyl, aryl or heterocycyl and in addition any two of L.sup.1, L.sup.2 and L.sup.3 and any two of L.sup.4, L.sup.5, L.sup.6 and L.sup.7 may together represent the elements needed to complete a carbocyclic or heterocyclic ring having from 5-12 carbon atoms;A.sup.1 may be the same as A.sup.2 and in addition may represent a substituted or unsubstituted aryl group;A.sup.2 represents a basic substituted or unsubstituted heterocyclic nucleus; andB.sup.1 and B.sup.2 represent cyano, cyanoaryl, carboxy, alkoxycarbonyl, aryloxycarbonyl, alkylsulfonyl, acyl, arylcarbonyl, heteroyl groups such as benzofuroyl, nitro, nitro substituted aryl, sulfonyl, fluorosulfonyl, tirfluoromethylsulfonyl, carbamoyl, arylcarbamoyl, and alkylcarbamoyl orB.sup.2 may be combined with .dbd.CL.sup.4 --CL.
    Type: Grant
    Filed: February 14, 1979
    Date of Patent: June 9, 1981
    Assignee: Eastman Kodak Company
    Inventors: Frank G. Webster, Michael T. Regan, Louis J. Rossi
  • Patent number: 4255506
    Abstract: In general, materials having the structure ##STR1## wherein n equals 1 or 2;A represents phenylene, naphthylene, anthracenyl, anthracenediyl, and dibenzothien-diyl;R.sub.1 and R.sub.2 which may be the same or different when taken alone represent hydrogen, cyano, alkylcarbonyl and arylcarbamoyl, arylcarbonyl, cyanoaryl;R.sub.1 and R.sub.2, when taken together, represent sufficient atoms to form substituted and unsubstituted radicals selected from the group consisting of furanylidene, fluorenylidene, pyrimidinylidene, thiazolidinylidene, pyrrolinyl, and indenyl, isoxazolinylidene, pyrazolinylidene and indanylidene, wherein said substituents are selected from the group consisting of hydrogen, cyano, aryl, oxo, thioxo, nitro, alkyl, nitroaryl, carbamoyl and cyanoalkyl; andalkyl represents an alkyl group having from one to six carbon atoms; aryl represents an aromatic nucleus selected from the group consisting of benzene, naphthalene or anthracene, are useful in electrophoretic migration imaging processes.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: March 10, 1981
    Assignee: Eastman Kodak Company
    Inventors: James A. Van Allan, Louis J. Rossi, Melvin S. Bloom, Michael T. Regan, Hal E. Wright, Joseph Y. Kaukeinen
  • Patent number: 4254198
    Abstract: Electrophotosensitive materials having the structure ##STR1## wherein: a and b represent zero, one or two;L.sup.1 through L.sup.7, which may be the same or different represent hydrogen, alkyl, aralkyl, aryl or dialkylaminoarylvinyl; or any two of L.sup.1, L.sup.2, and L.sup.3 or any two of L.sup.4, L.sup.5, L.sup.6 and L.sup.7 may, together with the atoms to which they are attached, represent the elements needed to complete a carbocyclic ring;R represents alkyl, aryl, nitroaryl or hydrogen;A.sup.1 represents aryl or a heterocyclic nucleus including those nuclei defined for A.sup.2 below;A.sup.2 represents a N-alkyl substituted nucleus of the type used in cyanine dyes.
    Type: Grant
    Filed: April 11, 1979
    Date of Patent: March 3, 1981
    Assignee: Eastman Kodak Company
    Inventors: Frank G. Webster, Michael T. Regan
  • Patent number: 4251609
    Abstract: Electrophotosensitive materials having the structure ##STR1## wherein R represents a basic heterocyclic nucleus as well as groups such as hydrogen, alkyl, aryl, aralkyl, etc.;A.sub.1 represents a wide variety of basic heterocyclic nuclei;A.sub.2 represents aryl or may be the same as A.sub.1 ;G represents O or S;M is 0 to 3;N is 0 to 1; andL.sup.1, L.sup.2, L.sup.3, L.sup.4 and L.sup.5 represetn hydrogen, alkyl or aryl.
    Type: Grant
    Filed: April 9, 1979
    Date of Patent: February 17, 1981
    Assignee: Eastman Kodak Company
    Inventors: James R. Nonnemacher, Michael T. Regan, Frank G. Webster
  • Patent number: 4175956
    Abstract: Electrophotosensitive materials having the structure ##STR1## is disclosed wherein R.sub.1 and R.sub.2, which may be the same or different, represent a monovalent or divalent substituted or unsubstituted 5 to 13 member heterocyclic nucleus or a substituted or unsubstituted 5 to 10 member saturated or unsaturated carbocyclic nucleus and said hetero atom is selected from the group consisting of O and N;R.sub.3 represents H, alkyl, aryl, or cyano and carboxyesters;m represents 0 or 1;n represents 0, 1, 2 or 3; andsaid substituted R.sub.1 and R.sub.2 substituents are selected from the group consisting of alkyl, hydroxy, phenyl, oxo, benzyl, carbamoyl, acetamido, nitro, piperidinyl, halo, and substituted amino.
    Type: Grant
    Filed: February 10, 1978
    Date of Patent: November 27, 1979
    Assignee: Eastman Kodak Company
    Inventors: Neil F. Haley, James J. Krutak, Robert J. Ott
  • Patent number: RE30235
    Abstract: Colorant materials which exhibits useful levels of electrical photosensitivity are disclosed. These materials have the formula: ##STR1## wherein .[.n represents 0 or 1,.].m represents 1 or 2,Ar represents an aromatic group,A represents an alkylene group,R.sup.1 and R.sup.2, when taken together, represent an alkylene group,R.sup.1, R.sup.4, R.sup.5, and R.sup.6, when taken alone, each represent hydrogen, nitro, cyano, halogen, or one of various specified organo groups, andR.sup.2, when taken alone, represents hydrogen, an aromatic or an alkyl group.
    Type: Grant
    Filed: December 15, 1978
    Date of Patent: March 18, 1980
    Assignee: Eastman Kodak Company
    Inventor: Hal E. Wright