Abstract: A method for manufacturing a photosensitive silver halide emulsion which comprises the steps, in sequence, of forming silver bromide grains which have predominantly (111) crystal faces or mixed halide grains of any morphology in the presence of a hydrophilic colloid; contacting said grains with a silver halide complexing agent which also forms insoluble silver salts; spectrally sensitizing said grains with an aggregating spectral sensitizing dye prior to or simultaneously with chemical sensitization of said grains wherein said spectral sensitization takes place the presence of said silver halide complexing agent.

Abstract: Silver halide emulsions containing tabular silver halide grains are stabilized by the employment of a compound of the formula ##STR1## where R is --SO.sub.2 NH.sub.2, In a preferred embodiment an azaindene is also employed.

Abstract: A photographic processing composition which comprises an aqueous alkaline solution, a silver halide developing agent and a substantially water-insoluble, cationic polyoxyethylene amine containing 2 or 3 mols of ethylene oxide.

Abstract: A developer for lithographic proof films is described. The developer composition contains a glycol acetate, a cyclic alkyl glycol, a surfactant and a cosolvent, all present in a water base. No nonaqueous component of the composition exceeds 30 weight percent of the composition. The compositions are nontoxic, nonflammable and have good odor characteristics while providing developer properties equal or superior to the high solvent content developers of the prior art. The developers may be used to develop both process color films and opaque films.

Abstract: A scavenger-spreader element adapted for use with a photosensitive element to form a negative image is disclosed as well as methods for processing said photosensitive element to produce the negative image. The scavenger-spreader element comprises a support carrying a hydrophilic layer, a cross-linking agent for the polymeric thickener of the photographic processing composition, a barrier layer to control diffusion of said cross-linking agent and a layer adapted to possess substantial adhesion for the cross-linked polymeric thickening agent.

Abstract: A fluid drop dispenser is fabricated from an injection moldable plastic and includes inner and outer components each having an end wall and an axially extending cylindrical wall that define a respective counterbore for each component. The inner component is assembled to the outer component with the respective outer and inner axially extending walls defining an annular fluid receiving chamber therebetween. A nozzle is provided in the outer wall through which drops are ejected on demand. A piezoelectric actuator disc is mounted within the inner component with its periphery bonded to the cylindrical wall of the inner component. When the actuator disc is electrically excited, it undergoes a radially outward expansion to cause a predetermined quantity of fluid to be ejected from the annular chamber through the nozzle.

Abstract: An ink jet recording sheet comprising a transparent support carrying a layer comprising 5-100% by weight of a coalesced block copolymer latex of polyvinyl alcohol with polyvinyl (benzyl ammonium chloride) and 0-95% by weight of a water-soluble polymer selected from the group consisting of polyvinyl alcohol, polyvinyl pyrrolidone and copolymers thereof.

Abstract: An element for optically recording digitally encoded information which comprises a support carrying an array of discrete regular geometric spaced depressions in a surface, each of said depressions carrying material capable of a transformation in response to a level of radiation adapted to effect said transformation, wherein said transformation is optically detectable.

Abstract: A novel composition of matter comprising a polyacrylic acid/chitosan complex. This complex is particularly useful as a membrane or filter.

Abstract: Exposure patterns are formed in photosensitive material by multiple beam laser interferometry by a method which involves exposing said photosensitive material simultaneously to at least three coherent beams of exposing radiation wherein the sources of said beams are arranged substantially symmetrically around an axis perpendicular to the plane of said photosensitive material. Preferably, surface relief patterns are formed by developing said exposed material. Apparatus for providing such multiple coherent beams is also disclosed.

Abstract: Silver halide emulsions having tabular grains with a mean aspect ratio of at least 10 are prepared by inducing twinning on the (111) crystal plane in silver bromide grains and then growing the grains in a silver halide solvent solution for a time sufficient to provide said tabular grains.

Abstract: A laser beam apodizing filter comprising a print-out silver image comprised of silver grains having a diameter of about 0.5 .mu.m or less, said image being proportional in density distribution to the intensity distribution of the laser beam cross-section. Also disclosed is a method for forming the filter and a laser diffraction imaging apparatus, for making diffraction gratings, which employs the filter.

Abstract: A silver diffusion transfer film unit comprising photosensitive silver halide, silver precipitating nuclei, a stabilizing compound of the formulaXS(CH.sub.2).sub.n COORwherein X is a noble metal below silver in the Electromotive Series of Elements, n is 1, 2 or 3 and R is an alkyl or substituted alkyl group; and a compound of the formulaH.sub.x S.sub.y [(CH.sub.2).sub.b COOZ].sub.mwherein Z is hydrogen or alkyl, b is 1, 2 or 3, m=1 or 2, x=1 or 0 and y=1 or 2; when y=2, m=2 and x=0 and when y=1, m=1 and x=1.

Abstract: A multilayer element for the analysis of a liquid containing an analyte comprising a reaction layer which retains a predetermined amount of a diffusible reagent containing a detectable species; said reagent adapted to be rendered substantially non-diffusible by said analyte as a function of the concentration of said analyte; a registration layer adapted to receive reagent diffusing thereto; means for detecting said reagent in said registration layer and an insulating layer intermediate said reaction layer adapted to provide discrimination between detectable species in said reagent layer and said registration layer.

Abstract: A method for forming a photosensitive element which comprises contacting silver halide in a plurality of spaced depressions in a surface with a mixture of a silver halide solvent and preformed sensitivity centers.

Abstract: A dichroic light polarizer comprising a sheet of molecularly oriented polyacrylic acid/chitosan complex having incorporated therein a dichroic dye.

Abstract: A method for preparing a narrow-grain size distribution silver iodobromide emulsion which comprises precipitating silver iodobromide grains by simultaneously introducing an ammoniacal solution of silver nitrate and a solution of ammonium bromide into an ammoniacal solution consisting essentially of gelatin and a water-soluble iodide salt under conditions where silver ions are not in excess during said precipitation.

Abstract: Photosensitive silver halide grains are disclosed comprising a shell of silver halide substantially surrounding a water-soluble, non-silver containing grain as a core. Methods for forming silver halide grains having a water-soluble, non-silver containing core are also disclosed.

Abstract: Surface relief patterns of predetermined configuration are fabricated by a process which involves exposing a photosensitive material at a first position to a laser interference pattern, rotating said material about an axis perpendicular to its surface to a second position, exposing said material at said second position to a laser interference pattern, wherein at least one and preferably both of said exposures is individually below the effective threshold for linear response of said material, the points of intersection of the two fringe patterns being exposed above said threshold as a result of the combined exposures, and developing said material. The method provides a facile technique for the manufacture of surface relief patterns and is particularly useful when the pattern is of submicrometer size and difficult to manufacture by mechanical means.

Abstract: Photosensitive silver halide emulsions containing a green-sensitive dye of the formula ##STR1## wherein R is hydrogen or chlorine. The invention is also directed to the novel sensitizing dyes.