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.

Abstract: A process and apparatus for forming an electrostatic image on a photosensitive plate having a conductive base, a photoconductive layer overlying the base and exhibiting p-type or n-type semiconductivity, and an insulative layer overlying the photoconductive layer. The photosensitive plate is characterized in having carrier charge of a polarity corresponding to the conductivity type of the photoconductive layer injectable from the conductive base into the photoconductive layer and bound in the region of the interface between the insulative and photoconductive layers. The conductive base is transparent to activating light and the insulative layer is opaque to the activating light. A first charge of a polarity opposite to the conductivity type of the photoconductive layer is applied onto the insulative layer to inject and bind carrier charge in the region of the interface between the insulative and photoconductive layers.

Abstract: An electrophotographic element comprising a conductive substrate and a mono-layer type or multi-layer type photosensitive layer, superposed thereon, containing a photoconductive material in which said photoconductive material is a hydrazone compound having the following general formula (I) or an anile compound having the following general formula (II): ##STR1## [where R.sub.1 is a methyl, ethyl 2-hydroxyethyl or 2-chloroethyl group; R.sub.2 is a methyl, ethyl, benzyl or phenyl group; and R.sub.3 is chlorine, bromine, a C.sub.1 -C.sub.4 alkyl group, a C.sub.1 -C.sub.4 alkoxy group, a dialkylamino group with C.sub.1 -C.sub.4 alkyl or a nitro group.] ##STR2## [where R.sub.1 is the same as the said general formula (I); and R.sub.4 is a substituted or non-substituted phenyl, naphthyl, heterocyclic or C.sub.1 -C.sub.10 alkyl group.

Abstract: This invention is directed generally to a layered inorganic photoresponsive device, this device being comprised of a substrate, or supporting base, containing on its surface a layer of hole injecting material comprised of gold, a hole transport layer in operative contact with the hole injecting layer, the transport layer being comprised of a halogen doped selenium arsenic alloy, wherein the percentage of selenium present is from about 99.5 percent to about 99.9 percent, the percentage of arsenic present is from about 0.5 percent to 0.1 percent, the percentage of halogen present ranges from about 10 parts per million to 200 parts per million, followed by a charge generating material overcoated on the transport layer, this material being comprised of inorganic photoconductive substances, and as an optional layer a layer of insulating organic resin overlaying the charge generating layer. The transport and generating layers can also be comprised of one composite layer.

Abstract: A composite dual layered photoreceptor member useful in the field of electrostatic electrophotography. The photoreceptor has a support member with a bulk layer on the support member of vitreous selenium-tellurium composition and a thin overlayer of vitreous arsenic-selenium composition. The selenium-tellurium can, if desired, be doped with a halogen.

Abstract: An electrophotographic photosensitive body comprising a conductive support, a photoconductive layer thereon and a protective layer. The protective layer comprises a binder resin, an aromatic diamine and an organic halogen capable of producing a free halogen atom, such as iodoform, carbon tetraiodide, pentabromoethane, p-nitrotribromoacetophenone, trichloroacetophenone, tribromomethylphenylsulfone, bis(tribromomethyl)-sulfoxide, and p-bromobenzenedichlorosulfonamide.

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, trifluoromethylsulfonyl, carbamoyl, arylcarbamoyl, and alkylcarbamoyl orB.sup.2 may be combined with .dbd.CL.sup.4 -CL.

Abstract: This specification discloses a method of toner transfer development in which one-component magnetic developer is conveyed to a developing position by the action of a magnetic field and a low frequency alternating electrical bias is applied to the space between a latent image bearing member and a developer carrying member at that position to thereby develop a latent image. This development provides visible images excellent in sharpness and tone reproduction.

Abstract: An electronic copying apparatus includes a photosensitive drum having a drum body and a photosensitive layer of (ZnO) formed on the outer periphery of the drum body. Said drum body has a hollow cylinder made of paper or synthetic resin, a conductive layer formed on the outer periphery of said hollow cylinder and a low resistance layer formed on the outer peripheral surface of the conductive layer, said photosensitive layer formed on the outer peripheral surface of said low resistance layer.

Abstract: Disclosed is a novel hole trapping layer and the use of this layer in an overcoated photoresponsive device, this hole trapping layer being comprised of materials of the following formulas: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, and R.sup.6 which may be the same or different radicals, are selected from aliphatic, substituted aliphatic, aromatic, and substituted aromatic, the substituents including for example alkyl, halogen and the like, x and y are numbers from 2 to about 10 and preferably from 2 to about 4, m and n are numbers of from 1 to 3, the sum of m and n being equal to 4, and Z is a sulfonyl (--SO.sub.2) or a carboxyl (--CO.sub.2) radical. Examples of aliphatic radicals include alkyl of from 1 to about 20 carbon atoms such as methane, ethane, propane, butane, isobutane, pentane, neopentane, heptane, decane, tetradecane, eicosane, and the like.

Abstract: A photosensitive member is exposed to light prior to primary charging so that the surface potential applied by primary charging may always be maintained at a constant level to which the photosensitive member is always charged when it is repetitively used for some time, which may be predetermined by test. Until the surface potential reaches this level, the intensity of light for pre-exposure is gradually decreased and after the surface potential has reached this level, no pre-exposure is applied. But when the surface potential rises after a predeterminable period during which the photosensitive member is not used, the pre-exposure is applied again. All the copies may have the same density.

Abstract: This invention is generally directed to inorganic overcoated photoresponsive devices comprised of a substrate, a layer of hole injecting material capable of injecting holes into a layer on its surface, this layer being comprised of trigonal selenium, a hole transport layer in operative contact with the hole injecting layer, this layer being comprised of a halogen doped selenium arsenic alloy, wherein the percentage by weight of selenium present is from about 99.5 percent to about 99.9 percent, the percentage by weight of arsenic present is from about 0.1 percent to about 0.5 percent, and the halogen is present in an amount of from about 10 parts per million, to about 200 parts per million; a charge generating layer overcoated on the hole transport layer, comprised of an inorganic photoconductive material; and a layer of insulating organic resin overlaying the charge generating layer.

Abstract: Personal identification documents are fabricated by liquid developing an electrostatic image on a photoconductive insulating member to form a high resolution toner image which includes a visually verifiable feature of the authorized document holder and thermally transferring such image from the photoconductor to a core substrate having general authenticating data or to a cover sheet which is subsequently laminated to such a core substrate.

Abstract: This invention is generally directed to inorganic overcoated photo-responsive devices comprised of a substrate, a layer of hole injecting material capable of injecting holes into a layer on its surface, this layer being comprised of trigonal selenium, a hole transport layer in operative contact with the hole injecting layer, this layer being comprised of a halogen doped selenium arsenic alloy, wherein the percentage by weight of selenium present is from about 99.5 percent to about 99.9 percent, the percentage by weight of arsenic present is from about 0.1 percent to about 0.5 percent, and the halogen is present in an amount of from about 10 parts per million, to about 200 parts per million; a charge generating layer overcoated on the hole transport layer, comprised of an inorganic photoconductive material; a hole trapping layer overcoated on the generator layer, the trapping layer being comprised of a halogen doped selenium arsenic alloy, containing from about 95 percent selenium, to 99.

Abstract: An electrophotographic element that comprises an electrically conductive support and a photoconductive layer containing a photosensitive azo-compound dispersed in a film-forming polymeric binder is prepared by synthesizing the photosensitive azo-compound in situ, by reaction between a diazonium compound and an azo-coupling component, in the film-forming polymeric layer on the support. The azo-compounds thus synthetized are distributed in the binder layer in an almost perfectly homogeneous form. Under an electron microscope screen scan they are not distinguishable as separate particles, even at a ten thousand fold magnification. By forming a very thin photoconductive layer in this way and coating it with a charge transporting top layer, especially useful electrophotographic elements are obtained. The invention relates also to electrophotographic elements prepared according to the process.

Abstract: An electrographic developing method comprising forming a magnetic brush of a developer composed of at least two components of insulating toner particles and insulating carrier granules, and brushing a surface bearing an electrostatic latent image with the brush to render the latent image visible, the carrier granules having the properties of (1) triboelectrifying the toner particles to a polarity suitable for developing the latent image by coming into frictional contact with the toner particles, (2) being magnetic, (3) having a resistivity of at least 10.sup.12 ohm-cm, and (4) being 5 to 40 .mu.m in size.

Abstract: A multilayer photoconductive element containing a photoconductive insulating composition and a conducting layer, such element having in association with the photoconductive composition an amorphous, water-insoluble polyester selected from the group consisting of(a) polyesters prepared from units derived from at least one aromatic dicarboxylic acid component and at least one diol component, at least one of said acid or diol components being a non-linear monomer selected from the group consisting of an isophthalic acid component or a branched-chain alkylene diol having the formulaHO--CH.sub.2 --R.sup.1 --CH.sub.2 --OHwherein R.sup.

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.

Abstract: A photosensitive member having at least two electrically operative layers. The first layer comprises a photoconductive layer which is capable of photogenerating and injecting photo-excited holes into a contiguous active layer. The active layer comprises a transparent organic material which is substantially non-absorbing in the spectral region of intended use, but which is "active" in that it allows injection of photo-excited holes from the photoconductive layer, and allows these holes to be transported through the active layer. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light, and development.

Abstract: A photoconductive material (11) is provided which has first and second photoconductive layers (13), (14) of different spectral sensitivities. The material (11) is charged at least twice to form a stratified charge pattern of opposite polarities. A color light image of an original document (24) is radiated onto the material (11) to form an electrostatic surface potential pattern having high and low potential areas of one polarity and another area of the opposite polarity corresponding to three respective colors. The areas are developed separately using toners of the three respective colors to form a three color toner image which is transferred to a copy sheet (36). One of the colors may be black.