Abstract: A method for color accenting selected portions of a photocopy wherein a photoconductive surface is exposed to a light image of the document being reproduced, the non-selected portions of the resulting latent image are erased prior to developing the image with a given colored toner, and the developed image is transferred to a copy sheet before a subsequent reproduction of the document is performed. During the subsequent reproduction, the non-selected portions of the latent image remain on the photoconductive surface and the selected portions are erased prior to development with a different color than the given colored toner of the non-selected portions of the document and the transfer of the non-selected portions to the same copy sheet that previously received the selected portions.

Abstract: An imaging system is disclosed wherein unpigmented transparent xerographic toner images are used to make color and full color pictorial transparencies and selected hard copy according to specific toner-tacking methods.

Abstract: Carrier beads for use in an electrostatographic developer mixture comprise a glass core or iron-containing metal core enveloped with a coating of a copolymer of N-vinylcarbazole, trialkoxyvinylsilane and/or triacetoxyvinylsilane and optionally one or both of the monomers of the group consisting of C.sub.1 -C.sub.4 alkyl (meth)acrylate and styrene.

Abstract: A xeroradiographic system employing both fringe field and absolute development in order to provide both enhancement of sharply changing boundaries as well as imaging slowly changing borders is provided. This is accomplished by first developing the image with a colored toner in the fringe field i.e. far spaced electroded mode and then developing the electrostatic image in the absolute mode i.e. employing a closely spaced electrode to the latent electrostatic image with a contrasting colored toner.

Abstract: A novel yellow electrostatographic colorant is disclosed. This colorant may be employed as an electrostatographic toner or developer material. Electrophotographic processes are disclosed employing this colorant. When employed as an electrophotographic developing material, this colorant is found to possess superior triboelectric properties among others which result in superior electrophotographic machine life than known yellow colorants.

Abstract: In an electrophoretic reproduction process wherein a colored reproduction of an original is obtained by sequentially electrophoretically generating at least two visible monochromatic images, and superimposing said images in registry upon a copy web to form a colored reproduction, an improvement is provided comprising essentially eliminating back migration of marking materials from the copy web to the imaging suspension in the second and subsequent image generating steps by employing, in each instance, marking materials comprising a solvent tackifiable polymer and a colorant and/or a copy web containing a solvent tackifiable polymer, and applying to the copy web at least a partial solvent for said tackifiable polymer in an amount sufficient to render said polymer at least partially tacky before the second and before each subsequent image generating step.

Abstract: A copy sheet is held between a reciprocally rotatable drum and a holding roller which bears against the drum, and for each reciprocal rotation of the drum, an electrostatic latent image corresponding to one of a plurality of selected color separation images is formed on the sheet and each image is developed with a corresponding color developing solution. A mechanism is provided which is effective to prevent misalignment, in particular, lateral misalignment, between the plurality of color separation images which are formed in superposed manner on the sheet. After the formation of the electrostatic latent image, the sheet on the drum has its free end moved away from the peripheral surface thereof and is delivered, in floating condition, into a vessel which contains a corresponding color developing solution for the purposes of developing. This manner of developing minimizes the attachment of color developing solutions to unwanted portions and to prevent a mixing of different color developing solutions.

Abstract: There are described novel yellow compounds which are represented by the formula ##STR1## wherein X is a member selected from the group consisting of ##STR2## The compounds may be used for various applications and preferably are utilized as imaging particles in the photoelectrophoretic imaging method.

Abstract: A transparency is disclosed, which is suitable for use in a multicolored xerographic reproduction process comprising a transparent, thermoplastic film sheet having at least one surface coated with a long chain aliphatic ester. The ester coated transparency, when used in a multicolored electrostatic copying process improves adhesion of the multicolored image thereon and permits reproduction of colors and color densities in said image which correspond to the multicolored original.

Abstract: An electrophotographic printing machine in which color transparencies are reproduced. The printing machine includes a notch filter which transmits blue and green light images of the color transparency therethrough while blocking a portion of the red light image from passing therethrough.

Abstract: An overcoated photoconductive material is uniformly illuminated in the presence of an electric field to create persistent internal polarization. Minute, translucent toner particles are then applied onto the surface of the photoconductive member, and a colored light image is projected onto the surface of the photoconductive member through the toner particles. Equal numbers of the toner particles are colored in three primary colors respectively to form a tri-color mosaic pattern on the surface of the photoconductive member. Each particle absorbs light of its complementary color during the imaging step so that the internal polarization is dissipated in a pattern corresponding to a colored positive of the light image as quantized by the colored mosaic of toner particles. The particles which absorbed light, constituting a colored negative of the light image, are then selectively frictionally removed from the surface of the photoconductive member since the charge holding them to the surface is weak.

Abstract: The present invention relates to an electrophotographic color process comprising the steps of: (a) charging an electrophotographic light-sensitive material by corona discharge, said material having at least two kinds of color-producing photoconductive particles disposed at random on an electroconductive support, said color-producing photoconductive particles consisting essentially of a photoconductive particle, a sensitizer and a leuco dye, (b) exposing said charged material to light, (c) developing said material by toner containing acid substance, and producing color in the leuco dye by the interaction of the leuco dye with the acid substance, and forming a color image by carrying out once the procedure of charging, exposing and developing.

Abstract: Conversion of selected image portions of a black and white xerographic copy into color portions is accomplished by applying a donor sheet, having a colorant in a resin binder coated thereon, to the image portions and thereafter heating the donor. Upon stripping the donor from the xerographic copy, the toner in the image portions of the xerographic copy acquire a surface layer of the colored composition from the donor sheet thereby resulting in a color highlighting of the image. The use of a nonthermoplastic binder resin material having a melting point of above 250.degree. F is necessary to insure the nontransfer of the color composition to background areas of the xerographic copy.

Abstract: A process is described for performing color separations from a light-image of a colored original and for separately printing corresponding color separation images in registry onto a print sheet to provide a full color reproduction. The printing step is accomplished by thermographic dry image forming techniques.

Abstract: A multi-color electrostatic printing machine having processing components adapted to produce an image for each color of an original being copied, individual color developing units for effecting development of the corresponding images and a program arrangement for coordinating in timed sequence the operation of the processing components and the transfer of each developed image in superimposed relationship upon sheets of paper.

Abstract: A method of real-time color masking is disclosed wherein pairs of color filters are inserted at specific locations in the optical paths of an electro-optical image multiplication system to thereby produce a modulated radiation pattern representative of the product of the reflectance of the positive of one color component and the negative of other color components of the original.

Abstract: A negatively charged color toner for electrophotography composed of a polyester resin obtained by the reaction of polyol and dicarboxylic acid components and an organic pigment.

Abstract: An electrostatic image of graphical information is formed on a surface, for example that of an endless tape, a drum or suitable paper, and then magnetic toner particles are applied to the surface and adhere thereto in correspondence with the electrostatic image. Portions of the same surface, in the case of the tape, or of another surface, when the drum or paper are employed, are magnetized, as determined by the location of the toner prticles, to form a magnetic image corresponding to the electrostatic image. Then the toner medium are transferred by friction to a copy mdium such as ordinary paper, while the magnetic image is retained or stored on the surface. Toner particles then again can be applied to the magnetic image for production of additional copies.

Abstract: An electromagnetic radiation sensitive copy medium and method for producing positive or negative copies electrostatically. In a first embodiment the copy medium includes a poled, radiation transmissive, pyroelectric insulative layer, an electrically conductive layer, and a photoconductive layer interposed between and electrically connected with the insulative and conductive layers. A second embodiment includes two insulative layers, a photoconductive layer that is interposed between the insulative layers, and an electrically conductive layer that is juxtaposed with one of the insulative layers. A third embodiment is basically similar to the first embodiment except that it includes a plurality of photoconductive layers, each being sensitive to a single, but different, color of light.

Abstract: An improved photoelectrophoretic imaging method is disclosed wherein a blocking layer is provided with a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension upon exposure of the suspension to an electric field. The coating material occupies at least a substantially equal position in the Dark Charge Injection Series as any pigment in the imaging suspension. Subsequent or simultaneous electromagnetic radiation to which at least some of the particles are sensitive then results in the formation of optically positive and negative images.

Abstract: An electrophoretic migration imaging process, apparatus, and materials useful therein are disclosed. Electrically photosensitive particles, at least some of which bear a positive polarity electrostatic charge, are disposed between two spaced electrodes. One of the electrodes has the surface thereof adjacent to the electrically photosensitive particles bearing a uniform layer containing an amount of a dark charge exchange material sufficient to provide a net change in charge polarity with at least a portion of said positive polarity particles upon electrical contact therewith in the presence of an electric field and in the absence of activating radiation. Imaging is accomplished byA. disposing the electrically photosensitive particles between the spaced electrodes, andB. substantially simultaneously1.

Abstract: A first mist having at least one material is selectively applied to selected portions of a recording surface to form desired characters or other information thereon. A second mist of a material which reacts with the one material is applied to the recording surface. The reaction of the two materials forms a compound on the selected portions of the recording surface having a sufficient contrast with the recording surface to produce characters or other information on the recording surface. If the one material has an ink applied therewith to the recording surface, the material in the second mist reacts with the one material to enhance the contrast of the ink on the recording surface.

Abstract: A system for electrostatic photography using a camera having an aperture formed in one side for imaging light onto a photoconductive insulating layer positioned and supported in the camera housing to permit formation of an electrostatic latent image on dielectric film. A contact charging plate including a conductive layer and the photoconductive insulating layer is positioned in the camera so that light passing through the aperture is imaged onto the photoconductive layer. A dielectric camera "film" is positioned adjacent the photoconductive insulating layer and the film and photoconductive layer are pressure biased against each other. A voltage pulse is applied between conductive layers on either side of the dielectric film and photoconductive layer during exposure of the photoconductive layer to an image to establish on the film an electrostatic latent image which is developed with toner marking particles.

Abstract: Reproduction of a multicolor original is obtained in an electrophotographic process with multiple development employing a liquid developer comprising an insulating liquid and suspended therein photoconductive particles and colored toner particles. Prior to the second and subsequent development steps, the imaging surface is contacted with a toner free insulating liquid.

Abstract: An improved photoelectrophoretic imaging method is disclosed wherein the imaging suspension is brought into contact under a first electrical field with a blocking layer having a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension. The imaging suspension is then exposed to appropriate electromagnetic radiation while under a second electrical field. A second blocking layer, free of said coating is employed to produce positive and negative images.

Abstract: An improved photoelectrophoretic imaging method is disclosed wherein a blocking layer is provided with a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension upon exposure of the suspension to an electric field. The coating comprises a dark charge injecting agent dispersed in an electrically insulating, alkyd resins derived from dibasic acids and polyhydric alcohols. Subsequent exposure to electromagnetic radiation to which at least some of the particles are sensitive then results in the formation of optically positive and negative images.

Abstract: An improved photoelectrophoretic imaging method is disclosed wherein a blocking layer is provided with a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension upon exposure of the suspension to an electric field. The coating comprises a compound selected from the group consisting of inorganic salts of lithium, iodine, tin and iron.

Abstract: A transparency is disclosed, which is suitable for use in a multicolored xerographic reproduction process comprising a transparent, thermoplastic film sheet having at least one surface coated with a material selected from the group of long chain aliphatic hydrocarbons. The coated transparency, when used in a multicolored electrostatic copying process improves adhesion of the multicolored image thereon and permits reproduction of colors and color densities in said image which correspond well to the multicolored original copied.

Abstract: An electrophotographic printing machine in which successive colored filtered light images expose a photoconductive member recording successive charge patterns thereon. Each charge pattern is developed with single color magnetic particles forming successive single color powder images on the photoconductive member. These single color powder images are transferred, in superimposed registration, to a sheet of support material. The superimposed powder images are permanently affixed to the sheet of support material producing a colored copy of the original document being reproduced by the electrophotographic printing machine.

Abstract: In a photoelectrophoretic imaging system, a field established between first and second electrodes is modified in a manner for substantially reducing the field between these electrodes in an area in conformity with a desired border for an image being reproduced. In a particular arrangement, electrodes are arranged and positioned adjacent an insulating surface of the first electrode for discharging the charge accumulated at the surface and establishing the surface at a potential equal to the potential of the second electrode.

Abstract: There is disclosed a multicolor reproducing apparatus, wherein a developing unit is maintained in a stationary position, while developing troughs in the developing unit are shifted to a given position for selecting a developing color, and development is effected by transporting a sensitive paper to the developing through.

Abstract: A sheet of support material in which a non-fibrous image receiving portion has a fibrous portion secured thereto. The fibrous portion cooperates with a sheet feeding apparatus to facilitate the seriatim feeding of successive sheets of support material from a stack thereof.The foregoing abstract is neither intended to define the invention disclosed in the specification, nor is it intended to be limiting as to the scope of the invention in any way.

Abstract: A transparency is disclosed, which is suitable for use in a multicolored xerographic reproduction process comprising a transparent, thermoplastic film sheet having at least one surface coated with a material selected from the group of nonvolatile amine compounds. The coated transparency, when used in a multicolored electrostatic copying process improves adhesion of the multicolored image thereon and permits reproduction of colors and color densities in said image which correspond well to the copied multicolored original.

Abstract: There are described novel yellow compounds which are represented by the formula ##SPC1##Wherein X is a member selected from the group consisting of ##SPC2##The compounds may be used for various applications and preferably are utilized as imaging particles in the photoelectrophoretic imaging method.

Abstract: A transparency is disclosed, which is suitable for use in a multi-colored xerographic reproduction process comprising a transparent, thermoplastic film sheet having at least one surface coated with a mixture consisting of a vinyl chloride-acetate copolymer resin and an acrylic resin in a weight ratio of between about 6:4 and 7:3. In a preferred embodiment, a percentage of a particulate material is also incorporated in the coating to reduce static charge on the transparency and permit easier handling thereof. The coated transparency, when used in a multi-colored electrostatic copying process improves adhesion of the multi-colored image thereon and permits reproduction of colors and colors densities in said image which correspond well to the multi-colored original copied.

Abstract: An apparatus for developing an electrostatic latent image. The apparatus is moved from an inoperative position spaced from the latent image to a position in operative communication therewith. After the latent image is developed, the apparatus is moved to the inoperative position thereof.

Abstract: An electrostatic copying machine comprises a photosensitive screen having a number of fine openings therein, means for forming on the screen a primary electrostatic latent image corresponsing to an original image, an electrostatic attracting device for electrostatically attracting a recording material and moving said recording material in facing relationship with the surface of the screen on which the latent image is formed, a device for supplying the recording material to the electrostatic attracting device, and means for forming a secondary electrostatic latent image on the recording material conveyed by the attracting device.

Abstract: An optical system in which a screened light pattern and a light image of an original document are projected onto a common region of a light receiving member forming a modulated light image thereon. Collimated light rays are employed in the formation of the screened light pattern.

Abstract: A light-transparent photoconductive material for use in electrophotography is the reaction product obtained by condensingA. an organic photoconductive compound containing an amino and/or hydroxyl group andB. a reactive colored compound containing an active halogen atom;Or by condensingA. an organic photoconductive compound containing an active halogen atom andB. a reactive colored compound containing an amino and/or hydroxyl group.

Abstract: A magenta image dye-providing compound having a formula as follows: ##SPC1##Wherein:Car represents a carrier moiety which, as a function of oxidation under alkaline conditions, releases a diffusible dye from said compound;m and q each represent an integer having a value of 0 or 1;X represents a bivalent linking group;Z.sup.1 represents hydrogen or Z;R.sup.1 represents hydrogen, an alkyl radical an alkoxy radical having 1 to about 4 carbon atoms, or halogen;D represents cyano, sulfo, fluorosulfonyl, halogen, a --SO.sub.

Abstract: Magenta image dye-providing compound having formulas as follows: ##SPC1##Wherein:Car represents a carrier moiety which, as a function of oxidation under alkaline conditions, releases a diffusible dye from said compound;m and q each represent an integer having a value of 0 or 1;X represents a bivalent linking group;R represents hydrogen or alkyl;J represents a bivalent radical selected from sulfonyl or carbonyl;Q represents hydrogen, hydroxy or an acylamino radical;G represents hydroxy, a salt thereof, or a hydrolyzable acyloxy group;r represents an integer having a value of 1 or 2;Z represents cyano, trifluoromethyl, a carboxy, a carboxylic acid ester, nitro in the 2- or 3- position relative to the azo radical, fluorosulfonyl, sulfo, halogen, an alkylsulfonyl radical; a phenylsulfonyl radical, alkylcarbonyl, a sulfamoyl radical; a carbamoyl radical, and, in formulas I or II when r is 1, Z may represent a radical having the formula Car-[X--(NR--J).sub.q ].sub.

Abstract: A nondiffusible sulfonamide compound which is alkali-cleavable upon oxidation to release a diffusible magenta color-providing moiety from a benzene nucleus thereof, said compound having a formula as follows: ##SPC1##WhereinBall represents an organic ballasting group.Y represents the carbon atoms necessary to complete a benzene or naphthalene nucleus;X represents a bivalent linking group;R represents hydrogen or alkyl;J represents sulfonyl or carbonyl;M and q each represent an integer having a value of 0 or 1;R.sup.

Abstract: An electrophotographic process comprising forming an electrostatic image on the surface of a sensitive member, transferring the electrostatic image onto the surface of a transfer member, and developing the image so transferred.