Abstract: This is one-component type dry developer for an electrophotography which is improved on humidification ability, and consists of mixture of toner with a particle size of 5.about.50 (.mu.) and hydrophobic flow agent. The flow agent is made by covering inorganic, organic, metallic or alloy powder with thin film of non-hydrophilic synthetic resin. By using electric conductive material as core and making a range of resin film thickness so as to cause tunnel effect of electron or ion, the flow agent which has non-hydrophilic property and electric conductive property is obtained.

Abstract: Electrographic development apparatus of the kind having a developer housing and magnetic means for feeding developer along a path from a supply, to a developing position and back toward the supply includes cross-mix magnet means located proximate a portion of the developer path and means for oscillating the magnet means transversely across the path. In one preferred embodiment the cross-mix magnet and oscillating means are located external of the developer housing.

Abstract: Organic photoconductive elements which are stable and sensitive over a broad range of the spectrum, including the near infrared band, having a charge generating layer and a charge transport layer carried on an electroconductive support are disclosed. The invention involves the use of a first layer between the support and the charge generating layer which is capable of functioning as (i) an adhesive bonding layer on the electroconductive support to provide a receptive and retentive base layer for the charge generating layer and (ii) as a barrier layer to prevent substantially any leakage of charge from the surface of the photoconductor, characterized by the first layer comprising at least one polycarbonate having a weight average molecular weight ranging from about 25,000 to about 45,000, in combination with a charge generating layer that comprises at least one organic pigment which is sensitive to near infrared radiation.

Abstract: A developing method which comprises causing a layer of field-dependent developer which is supported on a supporting member and whose volume resistivity is 10.sup.12 .OMEGA..multidot.cm under an electric field of 30000 V/cm to be proximate to the surface of an image bearing member bearing a latent image thereon, and applying an AC voltage to between the substrate of the latent image bearing member and the developer supporting member to thereby effect development, and an apparatus therefor.

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.

Abstract: A layered electrophotographic photoconductor whose charge generation layer comprises a bisazo pigment selected from the group consisting of the bisazo pigments represented by formula (1) and whose charge transport layer contains a charge transport material selected from the group consisting of anthrancene compounds represented by formula (2) or from the group consisting of distyrylbenzene compounds represented by formula (3) ##STR1##

Abstract: Imaging processes where charge images are transferred from one surface to another are improved by the presence of conductivity sites on at least one of the surfaces, said sites being discrete, composed of an inorganic material, and having an average length between 1.0 and 20 nm. Between 0.1 and 40% of either the photoconductive surface or dielectric layer may be covered with electrically conductive sites.

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.

Abstract: An electrophotographic recording medium which consists essentially of an electrically conductive base and a photosemiconductive double layer which comprises a first layer containing charge carrier-producing dyes, and a second layer containing one or more compounds which are charge carrier-transporting when exposed to light, wherein the charge carrier-producing dyes are those of the general formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each hydrogen or a non-ionic substituent, X is the radical of a methyleneactive compound, or of an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic amine or hydrazine, and Z is hydrogen, methyl or phenyl, and the production of this recording medium.

Abstract: A developer for electrostatic images consisting essentially of particles comprising a pigment, a binder and an offset-preventing agent selected from the group consisting of aliphatic fluorocarbon compounds and fluorochlorocarbon compounds is disclosed. When this developer is used, a high offset-preventing effect can be attained at the fixing step even if the amount incorporated of the offset-preventing agent is small, and further, the developing operation can be performed in good conditions. By incorporation of this offset-preventing agent, the flowability of particles of the developer and charge characteristics of the developer can be remarkably improved.

Abstract: An electrophotographic method, in which a dielectric film is contacted with a surface of a charged and exposed electrophotographic layer and said film is acted on by positive and negative ions of the same concentration from a source of ions, which settle on the film and produce a latent image thereon. Then the electrophotographic layer is illuminated by an actinic light source to preserve the latent image on the film and the film is separated from the electrophotographic layer while being illuminated or after that. Thereafter the latent image obtained on the film is developed and fixed.

Abstract: An electrophotographic element which comprises a conductive substrate and a photosensitive layer, superposed thereon, consisting of a charge generation layer and a charge transport layer, said charge transport layer containing as an available ingredient a hydrazone compound having the following general formula (I): ##STR1## (where R is a hydrogen atom, an alkyl group, of from one to six carbon atoms, an alkoxyl group of from one to six carbon atoms, a substituted or non-substituted dialkylamino group, halogen, a nitro group or a hydroxyl group. n is an integer of 1-5. In case where n is 2 or more, R may be the same or different.).

Abstract: A method of reducing electromagnetic re-radiation of harmonic and intermodulation products by metal structures, having at least two adjoining elements, in response to an incident electromagnetic signal (rusty bolt effect). The method comprises the application between the adjoining elements of the structure, at their junction, of a layer of a non-water soluble substance having a dielectric constant greater than 10.

Abstract: An electrophotographic image carrier structure comprises an electrically conductive substrate, a selenium-containing photoconductive layer including more than 35% by weight arsenic, a polyvinyl carbazole covering layer and an intermediate amorphous selenium layer which is situated between the covering layer and the photoconductive layer and which has an arsenic content of zero to less than 0.5% by weight.

Abstract: A process for producing a liquid developer for electrostatic photography is disclosed. In the process, a dispersion of fine polymer particles in a non-polar solvent is mixed with a dye that is insoluble in said non-polar solvent and which is soluble in the monomer which is at least one component of the polymer. The polymer particles are then colored by removing from the dispersion a second solvent which dissolves the dye, is miscible with the non-polar solvent and which is capable of swelling at least part of the polymer in such a manner that said second solvent is present in said dye-containing polymer dispersion while the removal is continued.

Abstract: The invention relates to a process for electrophotographic color image development by which charge images are rendered visible by electrophoretic deposition of color zones on a continuously moving image carrier-band in development stations, using contact electrodes, development electrodes and blocking nozzles for the developer liquid whereby the development of the image in the development station is carried out with a substantial deviation .alpha. of the direction of movement of the image carrier from the horizontal.

Abstract: An improvement in the method of preparing a coating or layer of reprographic material upon a substrate which includes the conventional steps of coating the substrate surface with a layer of resinous binder curable upon exposure to radiant energy including electron beam and ultraviolet radiation, the binder layer containing reprographic solids. The resinous binder is applied as a fluid and is irradiated until a coherent and adherent layer is formed. The method includes the steps of forceably applying and tautly maintaining a sheet of a smooth flexible film against the surface of the curable resinous binder while directing a beam of radiant energy through the sheet and onto the binder while the layer of flexible film is held thereagainst. The exposure to radiant energy is continued until the resinous binder is substantially completely cured, whereupon the sheet of flexible film is removed from the surface of the binder.

Abstract: Porous toner comprises a coloring matter and a binder, said toner being formed by obtaining a powder through a step of mixing and kneading under heat a toner preparing material including a coloring matter, binder and elimination compound which neither softens or melts at a temperature at which said binder softens or melts, and by treating said powder with a solvent to remove said elimination compound.

Abstract: A developed electrostatic image is transferred from a support to a carrier sheet over a gap of between twenty and seventy microns. The gap is formed by dusting onto the developed electrostatic image particles of such size as to form the required gap or by providing protuberances on the insulating support, which may be a photoconductor. The protuberances on the support or the majority of dusted particles are spaced apart by four millimeters or less.

Abstract: This invention is directed to a layered organic photoresponsive device, and a method of highlight color imaging, the device being comprised of (1) a supporting substrate, (2) a layer of material capable of injecting holes into a layer on its surface, this layer being comprised of a material selected from the group consisting of carbon dispersed in a polymer, and graphite dispersed in a polymer, (3) a hole transport layer in operative contact with the layer of hole injecting material, which transport layer comprises a combination of a highly insulating organic resin having dispersed therein small molecules of an electrically active material, the combination of which is substantially nonabsorbing to visible light but allows injection of photogenerated holes from a photogenerating layer in contact with the hole transport layer, and electrically induced holes from the layer of injecting material, (4) a red sensitive charge carrier photogenerating layer sensitive to wavelengths ranging from about the visible range