Abstract: In a process for producing thermally developable light-sensitive composition which comprises heating a composition containing (a) an organic silver salt and (b) a light-sensitive silver halide, the improvement wherein the heating is conducted in the presence of (c) a sulfur-containing compound.
Abstract: A method of processing light-sensitive silver halide photographic material to be treated with a developing solution containing no hydroquinones developing agent, which material comprises a support, a silver halide emulsion layer coated thereon containing silver halide grains having an average grain size of 0.1 to 0.8.mu., at least 75% of said grains being within a range of 0.6 to 1.4 times the said average grain size, and a tetrazolium specified compound.
Abstract: Process for the preparation of silver images by imagewise exposure of a photographic material comprising at least one light-sensitive silver halide emulsion layer and treatment of the material with a developer composition, wherein the improvement comprises the development is carried out in the presence of 3-mercapto-5-(2-furyl)-1,2,4-triazole. The 3-mercapto-5-(2-furyl)-1,2,4-triazole decreases the fog during development, and when this is the first development in a black-and-white or color reversal process, increases the reversal silver or color density.
March 15, 1978
Date of Patent:
July 1, 1980
Heinrich Odenwalder, Anita von Konig, Franz Moll, Walter Patzold, Lothar Rosenhahn, Friedhelm Sommer
Abstract: A photographic developer composition containing Phenidone and hydroquinone in a 1 to 2 weight ratio, the composition having a gamma less than 1 and a pH in the range of about 9.8 to 10.4. The composition is particularly useful as an extended range developer for rapid processing of aerial film.
January 12, 1979
Date of Patent:
May 27, 1980
The United States of America as represented by the Secretary of the Air Force
Abstract: Quinoxalines of the formula ##STR1## are provided, in which R.sub.1 and R.sub.2 independently are lower alkyl R.sub.3 is lower alkyl, --CH.sub.2 OR.sub.5, --CH.sub.2 NRR', --CH.sub.2 OCOR, --CH.sub.2 Cl, --CH.sub.2 Br, --CH.sub.2 SR, --CH.sub.2 O(CH.sub.2).sub.p OR, --CH.sub.2 PO(OR.sub.5).sub.2, --CH.sub.2 PO(OR.sub.6).sub.2, --CH.sub.2 SO.sub.3 R.sub.6, --O(CH.sub.2).sub.m OR, --O(CH.sub.2).sub.p SO.sub.3 R.sub.6 or --(OCH.sub.2 CH.sub.2).sub.n OAr, R.sub.4 is hydrogen, lower alkyl or alkoxy when R.sub.3 is other than lower alkyl, or R.sub.4 is --OH, --NRR', --NHCOR, --NHCOAr', --NHSO.sub.2 R.sub.5 or --NHSO.sub.2 Ar', R and R' independently are hydrogen or lower alkyl, R.sub.5 is lower alkyl, R.sub.6 is hydrogen, an alkali metal cation or --N.sup..sym. (R).sub.4, Ar is aryl or sulphonated aryl, Ar' is aryl or substituted aryl, m is 3 or 4, n is 1 to 3 and p is 2 to 4.The quinoxalines are useful as bleach catalysts, especially as dye bleach catalysts, for the photographic silver dye bleach process.
Abstract: Disclosed is a recording material comprising a first transparent, dielectric support member having on one surface thereof a plurality of first elongated, electrically conductive regions extending adjacent one another in spaced relationship; a layer comprising a photo-conductive, thermoplastic material adjacent to, but spaced from, the surface of the first support member; and a second transparent dielectric support member positioned contiguous to the photo-conductive layer on the side opposite the first support member, the second support member having on the surface thereof adjacent the photo-conductive layer a plurality of second elongated, electrically conductive regions extending adjacent one another in spaced relationship, the longitudinal axis of each of the second elongated, electrically conductive regions extending generally transversely to the longitudinal axis of each of the first elongated, electrically conductive regions to form cross-over regions.
Abstract: An adjustable, rectangular paint guard for masking glass window panes of varying dimensions, comprising four separate sections, each of which has two exterior, linear edges which meet to form one of the four corners of the paint guard, each section being in overlapping relationship to two of the other sections. Flexible molding extends from each linear surface, the bottom edge of the molding capable of abutting engagement with the inner margins of the pane. In the first embodiment, the sections are simultaneously adjusted to the desired positions for a square window pane and in the second embodiment, the sections are capable of individual adjustment so as to accomodate rectangular-shaped panes of different dimensions.
Abstract: A method produces a reproducible image on a film in a single machine. Steps include exposing the film to an image, passing the exposed film to a developing station and developing the film. An improved method controllably recovers the exposed film from the single machine without developing the film. The exposed film is subsequently exposed to a second different image in the single machine to form a composite exposed film. The composite exposed film is passed to the developing station and developed in the single machine to produce a composite image film for reproduction purposes.
Abstract: An improved process for forming an amplified dye image on an image-wise, exposed light-sensitive silver halide photographic material is described, which, after developing, is processed with an amplifying solution the improvement being in that (a) the coupler is in stoichiometric excess of at least 50% relative to the amount of silver halide, (b) the dry thickness ratio of the hydrophilic colloid layer to the silver halide emulsion layer is 1 to 10 and (c) the amplifying solution contains hydrogen peroxide.
Abstract: Process of forming a high-contrast silver image which process comprises treating a light-sensitive silver halide photographic material comprising a support, a silver halide emulsion layer coated thereon and another hydrophilic colloidal layer, at least one of which contains a substantially non-diffusible compound having oxidation power on a hydroquinone developing agent, with a developer containing no hydroquinone developing agent after exposed imagewise.
Abstract: A two-step black and white photographic process in which conventional black and white developing of latent images in a silver halide black and white emulsion first is carried out and then, instead of simply fixing the developed emulsions containing black and white images, the emulsions are fixed and bleached concurrently for a short period of time long enough to perform the fixing and to enable a controlled mild degree of bleaching to occur. Such bleaching is carried out only for a time long enough selectively to attack low-density areas of freshly developed black and white images at a greater rate than areas of heavier density so as to depress the toe of the D log E curve without markedly affecting the balance of the curve, thus enhancing the images by obtaining a general increase of contrast, a reduction or total elimination of fog and a reduction or elimination of film haze, this latter being applicable primarily to radiology.
Abstract: Arginine or an acid addition salt thereof is used as a development accelerator in the color development of color photographic materials, either in the color developer bath or in the color photographic material.
Abstract: A photosensitive printing plate with high sensitivity comprising a support having a hydrophilic surface and formed in succession thereon (1) a layer of an oleophilic photosensitive resin composition whose solubility in a solvent is changed by exposure to light to which the resin composition layer is sensitive and (2) directly on the layer (1) a layer containing a dispersion of particles of photosensitive silver halide grains coated with a water-soluble polymer in an oleophilic polymer capable of being dissolved in a developer for the photosensitive resin composition.
Abstract: In a heat developable photographic material and process for providing a dye enhanced silver image, an element comprising a support having thereon in reactive association: (A) at least one heat developable photographic layer comprising (i) photosensitive silver halide, (ii) at least one active silver halide developing agent, (iii) an activating concentration of a development activator precursor, and (iv) a polymeric binder and (B) at least one layer comprising an azoaniline dye that is bleached in the non-image areas of the described element upon development of a latent image in the layer (A) by uniformly heating, can provide an improved image. After imagewise exposure of the described heat developable material, a dye enhanced silver image can be provided by heating the element containing the described combination of layers and materials.
Abstract: This invention relates to a light-sensitive copying composition comprising a diazonium salt condensation product, a stabilizer, and a polyurethane prepolymer with free terminal isocyanate groups.
Abstract: A method for developing a light-sensitive lithographic printing plate having an image-forming layer containing a substantially water-insoluble diazo resin thereon using a developer composition which comprises (a) benzyl alcohol, .alpha.-methylbenzyl alcohol, ethylene glycol monophenyl ether and/or ethylene glycol monobenzyl ether, (b) an anionic surface active agent and (c) a water-soluble sulfite.
Abstract: A new process for the regeneration of spent color developers using both an ion exchanger and certain adsorbents is described. This process preserves the capacity of the exchanger to be regenerated.
Abstract: Positive images including color images are obtained by a photographic reversal process by imagewise exposure of a material which comprises at least one light-sensitive silver halide emulsion layer, black and white development, fogging and color development characterized in that the fogging is carried out in the presence of a compound of the formula ##STR1## wherein the symbols are defined as hereinafter.
Abstract: Development inhibitor releasing compounds are thioether compounds capable of releasing on reaction with color developer oxidation products, a diffusible mercaptan that inhibits further development of silver halide. Useful DIR compounds correspond to the formula ##STR1## R.sup.1 represents hydrocarbyl Y represents --S-- or --NR.sup.2 --R.sup.2 represents hydrogen, hydrocarbyl or an electron-attracting substituent.X in its preferred embodiment represents a heteroaromatic group that when split of together with the sulfur atoms forms a silver halide development inhibiting mercaptane.
February 16, 1978
Date of Patent:
January 15, 1980
Karl Kuffner, Wolfgang Lassig, Ernst Meier, Erwin Ranz, Karl-Wilhelm Schranz
Abstract: A process for obtaining a half-tone picture of irregular structure consists in exposing a coarse-grained silver-halide material with an average linear size of silver halide micro-crystals of 4 to 6 microns, developing the exposed material in an infectious developer, printing the resulting picture on a high-contract photosensitive material, and developing the exposed high-contract photosensitive material. The process permits obtaining a high-quality half-tone picture with the optical densities of the original being reproducible within the range of more than 1.0. The process is simple and easily controllable.
November 28, 1977
Date of Patent:
December 25, 1979
Vsesojuzny Gosudarstvenny Nauchno-Issiedovatelsky I Proekthyinstitut Khimo-Forograficheskoi Promyshlennosti
Jury S. Andreev, Olga V. Pyasetskaya, Galina G. Leonova