Abstract: A method of producing an optical element having a multiple-level step-like structure includes a first process for providing a first mask pattern at a position corresponding to a predetermined boundary among boundaries at steps of the multiple-level step-like structure of a substrate, the first mask pattern having a width narrower than that of a single step, a second process for providing a second mask pattern upon the substrate having the first mask pattern formed thereon, the second mask pattern having a width corresponding to a single step or plural steps of the multiple-level step-like structure and a third process for processing the substrate by use of the first and second mask patterns and thereafter for removing the second mask pattern while leaving the first mask pattern there. After repeating the second and third processes plural times of a predetermined number, the first mask pattern is removed.

Abstract: An electrophoretic display liquid composition for use in an electrophoretic display device that has a multiplicity of individual reservoirs, each containing the liquid, contains one or at least two sets of particles dispersed in a transparent and/or colored liquid system. The at least two sets of particles exhibit different, contrasting color and different charging properties from each other, while in the one particle system, the particles exhibit a different, contrasting color from the colored liquid. In all embodiments, at least one of the sets of particles are particles with adjustable morphology made from emulsion/aggregation process. The morphology of the particles is controlled to be from grape, cauliflower, raspberry, or potato up to substantially perfect spheres.

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 at least two sets of particles dispersed in a transparent liquid system, the at least two sets of particles exhibiting different, contrasting color and different charging properties from each other, and at least one of the sets of particles containing flow aid particles as additives upon an external surface of the particles. Preferred flow aid additives include silica and titania particles.

Abstract: A method for producing an electrophoretic display panel is provided. In the first process, elements including TFTs are formed on an element substrate, thereby pixel electrodes being produced thereon. In the second process, a bulkhead is placed on the element substrate. In the third process, an ink jet type of dispersion charging apparatus is used to charge the dispersion into divided cells partitioned by the bulkhead. In the fourth process, an upper opening of the bulkhead is sealed with a sealer. And in the fifth process, an opposing substrate on which a common electrode is formed is applied to the sealer in a manner that the common electrode faces the pixel electrodes.

Abstract: A method for printing carbonless forms on an electrostatic printer or copier and carbonless forms for use in electrostatic printers or copiers are disclosed. A method of printing carbonless forms comprises providing a recording sheet comprising a substrate, the substrate being coated with a coated front (CF) coating comprising a developer, hollow microspheres and a binder composition, wherein the binder composition comprises polyvinyl alcohol and printing on the recording sheet with an electrostatic printer or copier.

Abstract: An image is formed by a process comprising the steps of: preparing a substrate comprising a transparent substrate having formed thereon a transparent electroconductive film and a semiconductor thin film in this order; preparing in a vessel, which can hold an liquid, an aqueous liquid containing a coloring material and an electrodepositable material capable of chemically dissolving or sedimanting/precipitating depending on the change in the pH; connecting a device than can supply an electric current or an electric field in accordance with an image pattern to the transparent electroconductive film of the substrate; fixing the substrate so that the semiconductor thin film is immersed in the aqueous liquid; disposing a counter electrode as another member of an electrode pair in the vessel; disposing a prescribed photomask on the transparent substrate of the substrate; and carrying out light irradiation at the transparent substrate through the photomask so that an electrodeposited film containing the electrodeposi

Abstract: An electrophoretic display material and apparatus is disclosed, including a dispersion medium, a white particulate material having a volume median particle diameter Dw, and a colored particulate material having a color different from the color of the white particulate material and a volume median particle diameter Dc, and wherein a ratio Dc/Dw is from 1/1 to 1/50.

Abstract: The image recording process comprises the steps of preparing an aqueous coloring material liquid by dissolving or dispersing fine particles of a coloring material in an aqueous liquid, disposing an image supporting member and a counter electrode opposite thereto in the aqueous coloring material liquid, applying an electric current or an electric field corresponding to an image pattern between the image supporting member and the counter electrode, electrochemically depositing an image forming material containing the fine particles of the coloring material on the surface of the image supporting member thereby forming an image, and transferring the image forming material, in a condition where the image forming material contains 20 to 60% by weight of the aqueous liquid, onto a recording medium so as to record the image on the recording medium.

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.

Abstract: A method of forming an image comprising the steps of: preparing a device in which an image holding element which can functions as one of electrodes pair and which has a surface for holding an image and an opposite electrode which is the other of the electrodes pair are immersed in a dispersion of a coloring material fine particles in which ionized coloring material fine particles are dispersed in an aqueous liquid, and applying electric current to a desired area of the image holding element and the opposite electrode through the dispersion and depositing-building-up the coloring material fine particles to the desired area electrochemically to form an image, is disclosed.

Abstract: An electrophoretic display element includes a capsule having a first, larger surface and a second, smaller surface. The capsule contains a suspending fluid and at least one particle dispersed within said suspending fluid. Application of a first electrical field causes the particle or particles to migrate towards the first, larger surface of the capsule, causing it to take on the visual appearance of the particles. Application of a second electrical field causes the particle or particles to migrate towards the second, smaller surface, allowing the capsule to take on the visual appearance of the dispersing fluid or of a substrate or electrode positioned behind the display element. Displays may be fabricated from multiple display elements arranged on a substrate.

Abstract: Coated paper stocks for electrostatic imaging comprising a substrate coated on at least one surface with a resin layer comprised of olefinic material and a pin-hole free, continuous coating layer over said resin layer. The continuous layer has a glass transition temperature above 100.degree. C. and is comprised of one or more natural or synthetic film forming polymers. As a single layer this continuous coating layer functions as both a heat protective and imaging layer. In an alternate embodiment two separate coating layers are provided with separate heat protective and imaging functionalities.

Abstract: A method and apparatus for displaying capillary electrophoresis data wherein absorbance with respect to time is related to graphic values within a graphic range or scale of values and selected graphic values are displayed with respect to time. The selected graphic values may comprise a range hues, color saturation and/or brightness or may represent a monochromatic scale. The resulting representation may be horizontally aligned with the corresponding electrophoretogram absorbance values to provide both a quantitative value (electrophoretogram absorbance values) and qualitative (graphic stripe) display.

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.

Abstract: This invention is to provide a novel quinizarin compound which has a quinizarin structure represented by a following formula (1) having one to four of the 5, 6, 7, and 8 positions and at least either the 6 or 7 position formed of at least one member selected from the class consisting of secondary amino groups, alkylthio groups, and optionally substituted phenylthio groups, and having the remaining positions thereof formed of at least one member selected from the class consisting of hydrogen atom, halogen atoms, amino group, hydroxy group, alkoxy groups, and optionally substituted phenoxy groups, a method for the production thereof, and a dye, an electrophotographic grade color toner composition, a thermal-transfer recording sheet, an optical recording medium, an ink jet grade ink composition and a color filter severally comprising the quinizarin compound.

Abstract: A method for forming electrographic imaging elements comprising a uniform dielectric layer is disclosed. The method comprises coating a conductive coating composition containing polymerizable precursors onto a base, curing the composition to form a conductive layer, and coating a dielectric layer on top of the conductive layer. The elements can be used to produce images have higher image density, reduced background, reduced grain, reduced mottle, reduced overtoning, and greater small-scale uniformity than comparable images formed on electrographic imaging elements produced by other methods. The elements are particularly useful for forming large size colored images, such as are required for posters, displays, other indoor advertising.

Abstract: Electric discharge between a photosensitive member and a charge retaining medium is ON/OFF controlled by changing the gas pressure between these two members, so that it is possible to effect image recording in a state where a DC voltage is applied. Accordingly, it is possible to effect image recording on the charge retaining medium without the need for precise control for obtaining a high-voltage pulse and without employing an optical shutter. In addition, an electric charge that is emitted by a field is attracted to the charge retaining medium and accumulated on the surface thereof, thereby forming an electrostatic latent image, and thus making it possible to attain image recording of extremely high resolution.

Abstract: The present invention are dielectric black particles for use in electrophoretic images displays, electrostatic toner or the like, and the corresponding method of manufacturing the same. The present invention black particles are latex particles formed by a polymerization technique, wherein the latex particles are stained to a high degree of blackness with a metal oxide.

Abstract: A dielectric suspension for use in an electrophoretic image display, electrostatic printing or the like, comprising a suspension medium including a dense fluorinated solvent and a less dense hydrocarbon solvent, a plurality of pigment particles dispersed in the suspension medium, a fluid dye dissolved in the suspension medium for providing a contrast with the pigment particles, and a charge control agent adsorbed on the pigment particles for preventing the pigment particles from agglomerating.

Abstract: An electrostatographic imaging member assembly comprising a hollow electrostatographic imaging drum having a first end and a second end, at least one coating on the drum extending from the first end of the drum to the second end of the drum, the coating having an outer electrostatographic imaging surface, drum supporting hubs mounted on the first end of the drum and the second end of the drum, the drum supporting hubs comprising a disk shaped member comprising a disk shaped segment having an exposed annular landing strip surface parallel to and flush with the electrostatographic imaging surface, the annular landing strip surface having a width of at least about 3 millimeters and having an imaginary axis coextensive with an imaginary axis of the drum. The electrostatographic imaging member assembly may be utilized in electrostatographic imaging apparatus in which the hubs support electrostatographic imaging apparatus subassembly components.

Abstract: Mixtures of salts of organic carboxylic acids and organic compounds of non-salt character, dissolved in a C.sub.1 -C.sub.4 alkanol, can be concentrated or separated with a semipermeable membrane made from a copolyamide or copolyimide-amide which contains (a) a first aromatic diamine radical and (b) a second aromatic diamine radical which carries --SO.sub.3 M groups, where M is H.sup..sym., a monovalent to polyvalent metal cation or an ammonium cation. Provided the first diamine radical contains C.sub.1 -C.sub.4 alkyl groups in the o-positions to the amino groups, the copolymers are radiation-sensitive and can be used for producing protective layers or relief images, development being carded out in an aqueous alkaline medium.

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.

Abstract: A method of making a colloidal metal dispersion that is useful as a toner fluid. The method involves reducing a palladium and/or platinum metal of a metallo-organic palladium and/or platinum metal salt in a dispersing medium that contains a soluble surfactant and a carrier liquid. The palladium and/or platinum metal of the metallo-organic metal salt is reduced in the dispersing medium to form elemental metal particles. The soluble surfactant is present in the dispersing medium in an amount sufficient to charge and stabilize the elemental metal particles as a colloidal metal dispersion.

Abstract: A metallic toner fluid composition that contains (A) electrostatically charged, colloidal elemental metal particles dispersed in an electrically nonconductive organic carrier liquid having a dielectric constant less than about 3.5 and a volume resistivity greater than about 10.sup.12 ohm-cm, (B) a soluble surfactant in an amount sufficient to charge and stabilize the colloidal metal dispersion, and (C) an effective amount of organosol particles and/or a soluble polymer that is not a soluble surfactant (B). Also disclosed at a substrate coated with elemental metallic toner fluid particles. The coated substrate can act as a donor substrate for thermal mass transfer of images to a secondary receiving substrate by performing either or both of the following steps, in any order:a) transferring the elemental metal coating from the primary substrate to the secondary receiving substrate;b) contacting the elemental metal coated primary or secondary substrate with an electroless metal plating solution.

Abstract: An electrostatic attracting sheet which is used in a paper sheet-attracting device of X-Y plotter or the like, the attracting sheet being made of a high polymer substance selected from a group consisting of plastics such as polyurethane, polyacetal, polyamide and polyester, and synthetic rubbers and electrically conductive coated crystal whiskers of potassium titanate dispersed in the high polymer substance. In a first embodiment, the whiskers are homogeneously dispersed in the attracting sheet at 5 to 15 wt. % of the substance, the whiskers being 0.1 to 0.3 .mu.m in diameter, 10 to 30 .mu.m in length and coated with tin or antimony, to produce a sheet having a thickness of 0.2 to 0.8 mm and a volume resistivity on the order of 10.sup.13 .OMEGA.cm. In a second embodiment, the whiskers are distributed in the attracting sheet, in such a state that their longitudinal axes align with a direction in which a surface of the attracting sheet extends, at 2 to 8 wt. % of the substance, the whiskers being 0.2 to 0.5 .

Abstract: Mixtures of salts of organic dicarboxylic acids and organic compounds of non-salt character, dissolved in a C.sub.1 -C.sub.4 alkanol, can be concentrated or separated with a semipermeable membrane made from a copolyimide which contains a first aromatic diamine radical (1) and a second aromatic diamine radical (2) which carries --SO.sub.3 M groups, wherein M is H.sym., a mono-to trivalent metal cation or an ammonium cation. The first amine radical (1) and/or the second diamine radical (2) contains C.sub.1 -C.sub.4 alkyl groups in both o-positions to at least one amino group. These copolyamides are also radiation-sensitive (self-crosslinking) and can be used for the production of protective layers or relief images, development being carried out in an aqueous alkaline medium.

Abstract: An electrophoretic imaging device includes an electrosensitive layer; an insulating body arranged to confront the electrosensitive layer; a developing solution filled between the electrosensitive layer and the insulating body, with the developing solution prepared by dispersing two or more kinds of electrosensitive toners into an insulating solvent; a mechanism for applying a voltage between the electrosensitive layer and the insulating body; a mechanism for irradiating a toner selection light which causes at least one kind of electrosenstivie toner to be selectively sensitizxed; and an electrosensitive layer exposing mechanism for causing image data to be photosensitively written to the electrosensitive layer.

Abstract: A carbonless paper construction for imaging via electrophotographic copiers comprising microcapsules encapsulating solvents of dialkyl esters of aliphatic dibasic organic acids, polyglycol ethers and alkyl ethers of monobasic aromatic acids.

Abstract: Dual color imaging process and system providing formation of an image having adjacent first and second areas respectively containing first and second types of pigmented particles undesirably separated by third areas relatively free of particles of the first and second types and causing the image to flow into the third areas, thereby at least partially eliminating the third areas.

Abstract: A thin film optical waveguide made of a polymeric waveguiding film supported on a substrate, the film being made of a homopolymer of vinylpyridine or of a derivative or vinylpyridine in which the pyridine heterocyclic nucleus is substituted. Alternatively, a copolymer containing a major proportion of vinlypyridine, or of said derivative thereof, may be used in the film. A layer of a material having a lower refractive index may cover the film. The polymer may be modified to increase its capacity for refractive index variation in response to an electric field, by inclusion in the structure of the polymer of at least one optically nonlinear moiety. The polymer may also include cross-linking. The thin film optical waveguide may incorporate a laser dye in the film, for use with laser devices.

Abstract: In a process of image production by the steps of developing an electrostatic charge pattern with toner particles comprised of coloring matter in a thermoplastic resin binder and dispersed in a carrier liquid and fixing the pattern-wise deposited toner particles while still damp with said carrier liquid on a support by simultaneously subjecting the same to heat and pressure, the toner particles have at 120.degree. C. a melt viscosity when dry of from 500 to 100,000 Pa.s, a mean average diameter of from 0.1 to 5 .mu.m, and a ratio of coloring matter to resin binder of from 1/1 to 1/9 by weight.

Abstract: An imaging process which comprises the formation of an image on an imaging member; subsequently developing the aforementioned image with an electrophoretic liquid developer composition comprised of an insulating suspending fluid with a resistivity of from about 10.sup.12 ohm-cm to about 10.sup.16 ohm-cm, pigment particles, a stabilizer component, and a charge control additive; and wherein the resulting ink has a resistivity of from about 10.sup.9 to about 10.sup.12 ohm-cm; applying the ink composition from an applicator roll, which roll transports the ink to the imaging member surface; and wherein the ink is attracted to the charged areas of the imaging member.

Abstract: The invention is concerned with a method of preventing undesirable gas generation between a pair of opposite, electrically energized negative and positive electrodes spaced from one another by a gap filled with an aqueous electrolyte solution. According to the invention, the positive electrode is coated with an olefinic substance to form micro-droplets thereof on the surface of the positive electrode prior to electrically energizing the electrodes such that upon electrical energization hydrogen generated as a result of electrolysis is consumed by reaction with the olefinic substance to convert same by hydrogenation into an ethylenically saturated product, the hydrogenation reaction being carried out in the presence of a metallic oxide catalyst. In this manner, undesirable hydrogen generation and accumulation at the negative electrode is prevented.

Abstract: Electrophoretic process and apparatus for developing an electrostatic charge pattern carried by a dielectric surface by progressively moving that surface through a development station and simultaneously progressively advancing a layer of liquid toner (11) comprised of toner particles dispersed in a carrier liquid, through that station in proximity to said charge-carrying surface, (3), and imposing an electric field bias to cause or promote selective image-wise movement of toner particles through said liquid at said development station and deposition thereof on said charge-carrying surface in a pattern representing said electrostatic charge pattern, wherein said layer of liquid toner contains toner particles in a concentration of from 2 to 25% by weight, and including the step of applying a film of a substantially toner-free non-polar liquid which is miscible with the carrier liquid of said liquid toner and which has a specific conductivity lower than 0.

Abstract: Disclosed is a process for generating consistent high quality images comprised of (1) providing a xerographic imaging or printing apparatus; (2) adding thereto a stable two component developer composition comprised of toner composition with an average particle diameter of from about 6 to about 10 microns with resin particles, first pigment particles, second magnetite pigment particles, which are present in a greater amount than the first pigment particles, and blended flow additive particles; and carrier particles consisting of a ferrite core, or a steel core, and a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxysilane; and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images or magnetic images in the apparatus; and (4) developing the images formed.

Abstract: An electrophoretic display device is set forth having various electrode schemes in order to modulate transmission of light through the device. The electrophoretic particles of the suspension form an imaging structure relating to an array of small unit cells or pixels which are turned on or off by appropriate electrical signals. Accordingly, the pigment particles totally cover transparent electrodes, which condition can be changed by applying the appropriate electric field to the opposite electrode. By this structure, various alphanumeric displays can be constructed.

Abstract: Electrically photosensitive materials comprising electrically photosensitive colorant particles dispersed in a liquefiable, electrically insulating carrier containing a binder polymer and electropolymerizable bisphenol-acrylate monomers or mixtures of such monomers are disclosed. The disclosed materials are employed in photoelectrophoretic processes wherein the colorant particles are caused to migrate by the action of light and an electric field, while the material is electrohardened by the electric field.

Abstract: Presensitized lithographic printing plates, having extended press run life, are provided by electrolytically passing a current through the light-sensitive material in the prefabricated plate. Press runs of up to sixty percent longer than expected are possible with plates which are so treated.

Abstract: A process for treating exhaust gas from an electrophotographic machine which comprises oxidizing, in the presence of a heated oxidation catalyst, an odorous exhaust gas generated in course of the steps of developing an element being developed by means of a developer, transferring the thus developed image onto a transfer sheet and/or heating a copy material consisting of said element being developed or said transfer sheet thereby to make said exhaust gas odorless, and an apparatus therefor.

Abstract: Duplex photoelectrophoretic imaging is implemented with apparatus of the kind having first and second electrodes movable along respective endless paths and cooperatively forming an imaging nip by: (1) first forming a first suspension image on the first electrode and (2) then feeding a copy sheet into the imaging nip and forming a second suspension image on one side of the copy sheet while transferring the first suspension image to the other side of the copy sheet.

Abstract: An optically isotropic device or component made of an optically isotropic polymeric material which is a blend of two completely miscible polymers which have opposite optical anisotropies. The blend has zero birefringence which is not substantially affected by processing of the blend into the optical device or component.

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.

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.

Abstract: A planar array of microcells is formed in a support. An electrostatic charge pattern is established on the support differentiating first and second interlaid sets of microcells. An electrographic imaging composition is introduced into the first set of microcells, and a second, differing imaging composition is introduced into the second set of microcells. Multicolor photographic elements, particularly dye image transfer photographic elements, can be prepared.

Abstract: Compounds selected from the group consisting of (a) aromatic amines having a p-alkyl, p-alkoxy or p-alkoxycarbonyl substituent on the aromatic group, (b) aromatic alkanes, isoalkanes and cycloalkanes, having at least two aromatic groups with at least one aromatic group having an amino substituent, (c) dialkylarylamines having a pyranylalkenyl, a quinolinylalkenyl or a arylazo substituent on the aryl group, (d) a julolidine and (e) a isobenzofuran are useful as sensitizers in electrophoretic migration imaging dispersions and processes.

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.

Abstract: Electrophotosensitive materials having the structure ##STR1## wherein: r and s may be zero, one two or three;R.sup.1 and R.sup.2 may be the same or different and each may represent hydrogen, alkyl, aryl, alkoxyalkyl or alkoxyaryl;Y represents O or S;L.sup.1, L.sup.2, L.sup.3, L.sup.4 and L.sup.5 may be the same or different, represent hydrogen, alkyl, aryl or aralkyl and in addition either L.sup.1 and L.sup.2 or any two of L.sup.3, L.sup.4 and L.sup.5, together with the atoms to which they are attached, may represent the elements needed to complete a carbocyclic ring;A.sup.1 and A.sup.2 represent a substituted or unsubstituted heterocyclic nucleus.

Abstract: Electrically controlled color imaging with a mixture of electrophotosensitive particles of different color types is effected using a photoconductive insulator layer as a particle addressing electrode. A layer of such mixture adjacent the electrode is uniformly exposed by time-separated, different-color, light pulses and discrete portions of the photoconductor are selectively addressed, by activating radiation, in synchronization with the pulses and according to the image information of color image to be reproduced.

Abstract: An improved electrophoretic migration imaging process is disclosed wherein the improvement comprises the use of electrically photosensitive particles containing a colorant having an absorption maximum greater than about 410 nm. and having the formula: ##STR1## wherein n represents 0 or 1; m represents 1 or 2; Ar represents an aromatic group; Z represents the nonmetallic atoms to complete an aromatic group; and each of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 represents hydrogen, nitro, cyano, halogen, or one of various specified organo groups.

Abstract: Degradation of a liquid developer for developing electrostatic latent images is prevented by using a paper from which a rosin aluminum soap is not substantially eluted into the liquid developer when contacted therewith.