Abstract: Negatively charged liquid developers for use in electrostatic photography which comprises a highly insulating carrier liquid and, dispersed therein, a toner comprising colored particles coated with a synthetic polymer composition which is a mixture of vinyltoluene-butadiene or styrene-butadiene reaction products with acrylic and methacrylic acid and alkyl esters of such acids wherein the alkyl group contains 6 to 18 carbon atoms.

Abstract: A silver photosensitive material comprising a development inhibitor-releasing compound of the formula ##EQU1## wherein Z is an atomic group necessary to form a 5 to 7 membered saturated or unsaturated carbon ring with the carbon atoms to which it is attached, said ring being unsubstituted or substituted by at least one of halogen and a member of the class consisting of alkyl, aryl, alkoxy, acyloxy, aryloxy, SY and a group forming a condensed carbon ring with said saturated or unsaturated carbon ring; Y is arylmercapto, heterocyclic, thioglycollic acid, cystein or glutathione. A method for the development of silver halide photosensitive material by the use of the foregoing compound is also disclosed.

Abstract: This invention relates to supersensitizing dye combinations useful for organic photoconductive compositions comprising: at least one cyanine, merocyanine, rhodacyanine or styryl spectral sensitizing dye which1. has an anodic polarographic half-wave potential less than +1.0 volts;2. has an anodic polarographic half-wave potential and a cathodic polarographic half-wave potential which, when added together, give a sum more negative than -0.10 volts; and3. desensitizes negative silver bromide emulsions, containing 99.35 mole percent bromide, less than 0.4 log E at radiation of 365 nm. when incorporated therein at a concentration of 0.2 millimole of dye per mole of silver halide; and at least one electron-accepting dye such as a pyrylium or thiapyrylium salt as the supersensitizer.

Abstract: Novel method of free radical photography in which a colored image excellent in photographic properties such as gradient, resolving power, image stability, amount of fogs and contrast can be obtained while shortening the treating time and simplifying the treatment steps. The method comprises exposing a photosensitive composition comprising a film-forming transparent plastic, a compound capable of forming free radicals upon irradiation with light and a color former capable of reacting with these free radicals to produce color, to a light flash with a light quantity of 5 to 500 millijoules per square centimeter for a flashing time of 0.0001 to 0.005 second through a negative or positive original.

Abstract: Method and apparatus for preventing the overflow of liquid from between flexible layers on a solid surface. A groove is provided in the solid surface at a location not beyond the edge of at least the bottom flexible layer and preferably not beyond the edge of both flexible layers, to reduce, at the groove, the mechanical pressure (and optionally electrical pressure) forcing the flexible layers together to permit a liquid bead to form at layer portions adjacent the groove instead of having the liquid squeezed out and off the edge of both flexible layers.In a preferred embodiment, this system is used in photoelectrophoretic imaging using photoelectrophoretic suspension between webs having an electrical field thereacross, on a grooved curved surface, preferably a roller. The suspension is prevented from dripping out the edges of the webs which, inter alia, prevents the ink from seeping back along the web/roller interface which may adversely effect imaging.

Abstract: An induction imaging process wherein the electrophotographic imaging member comprises at least three separate and distinct layers; namely, a conductive substrate, a photoconductive insulating layer and an insulating film overcoating the free surface of the photoconductive insulating layer. This process provides an efficient route for latent image formation, development and erasure of charge carriers trapped at the interface of the insulating overcoating and the layer contiguous with said coating. This process is especially suitable for use in combination with polar liquid development.

Abstract: An improved electrophoretic development method comprising providing a liquid developer system having a backing electrode and a developer electrode, wherein the development electrode comprises a plurality of individually biased electrodes. According to this improved method, as an electrostatically imaged insulating member is contacted with the liquid developer and directed through a development zone defined by said electrodes, the leading edge of said insulating member selectively activates the individually biased development electrodes in synchronization with the travel of the insulating member through said zone, and the trailing edge of said insulating member selectively inactivates the individually biased development electrodes upon the withdrawal of the insulating member from said zone. This method is especially suitable for preparation of reversal images by electrophoretic development.

Abstract: Method for enhancing both the rate and completeness of discharge of a photoconductive insulating layer comprising phthalocyanine pigments. Such enhancement is achieved by incorporation within such layer of from about 0.1 to about 10 weight percent, based upon phthalocyanine content, of at least one charge transport sensitizer compound of the formula ##SPC1##Wherein R.sub.1 is alkyl of 1-6 carbon atoms;R.sub.2 is aryl, aralkyl, p-alkylaminophenyl, or substituted p-dialkylaminophenyl;R.sub.4 represents a hydrocarbon diradical making up the balance of an aromatic ring system;R.sub.3 is alkyl, aryl, alkaryl, heterocyclo, amino, alkyl substituted amino, nitro, alkoxy or halogen;X is sulfur, oxygen or selenium; andA is a monovalent or divalent anion.

Abstract: A reproduction apparatus for forming an image on a first and an opposing side of a copy sheet in a single pass including a moving photosensitive surface, a means for forming a first image on a first portion of the photosensitive surface and a second image on a second portion of the photosensitive surface, and means for transferring the first image and the second image to the first and the opposing side respectively of a copy sheet in a single pass of the copy sheet to the imaging surface. Preferably, the transferring means includes means for securing the trailing edge of the sheet to the imaging surface and means for pivoting the sheet about the surface. A process of duplex imaging in a single pass is also provided.

Abstract: In a process for producing a gelatino silver halide light-sensitive material containing a high silver halide content comprising applying a gelatino silver halide emulsion layer having a silver halide to gelatin weight ratio of at least 0.8 and a gelatin-containing protective layer to a non-hygroscopic film support having good dimensional stability and then drying the layers, the improvement which comprises drying the layers on the support when the water content becomes less than 300% based on the mean drying amount defined as: ##EQU1## BY CONTACTING SAID MATERIAL WITH AIR HAVING A RELATIVE HUMIDITY OF FROM 50 TO 75%.

Abstract: This invention relates to a photographic material yielding upon exposure a direct-positive image and to a process for the production of such material.

Abstract: A method for expediting the breaking in or aging of xerographic photoreceptors comprising a substrate and at least one selenium and arsenic-containing photoconductor layers and to improve low density image differentiation by initially exposing the photoconductor layers to a visible or ultraviolet light flux while at a temperature of not less than about 85.degree.C.

Abstract: Print contrast in zinc oxide-coated electrostatic copy paper is improved by the incorporation of small quantities of manganous chloride or manganous bromide.

Abstract: An electrophotographic material is provided herein which comprises a conductive support layer and a photoconductive insulating layer, the latter layer comprising a photoconductive polymeric compound such as poly-N-vinylcarbazole, and a sensitizer having the following general formula ##SPC1##WhereinB represents a radical selected from the group consisting of ##SPC2## ##SPC3##Compounds falling under the latter general formula include such compounds as 2-phenyl-4-[(2'-phenyl-4'-benzopyranylidene) benzyl]-benzopyrylium perchlorate and 2,3-phenyl-4-[(2'-phenyl 4'-benzopyranylidene)benzyl]-6-methylbenzopyrylium perchlorate.