Patents by Inventor Helmut Haseler
Helmut Haseler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5110715Abstract: The present invention relates to a photographic reversal process for the production of positive photographic images by imagewise exposure of the photosensitive material containing at least one silver halide emulsion layer, black-and-white first development of the material, chemical fogging or diffuse second exposure and subsequent color development, characterized in that1. at least one N,N-dialkyl-p-phenylenediamine derivative is used as sole developer in the first development,2. the first development bath contains at least one compound which prevents the developer oxidation product formed during the first development from reacting with the color couplers present in the color photographic reversal material to form image dyes,3.Type: GrantFiled: October 10, 1989Date of Patent: May 5, 1992Assignee: Agfa Gavaert AktiengesellschaftInventors: Ubbo Wernicke, Werner Berthold, Helmut Haseler, Gustav Tappe
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Patent number: 5004676Abstract: A new process for maintaining the properties of the developer in the preparation of colored images by development of exposed silver halide-containing material at an alkaline pH in a developer bath containing p-phenylenediamine derivative and at least 40 mol-% of the silver halide consisting of silver chloride and replenishing the color developer in the bath in such a limited quantity that no overflow occurs but it is sufficient to make up for the loss of bath constituents.This process preserves the sensitive results from development during use of the developer bath.Type: GrantFiled: February 14, 1990Date of Patent: April 2, 1991Assignee: Agfa-Gevaert AktiengesellschaftInventors: Heinz Meckl, Sieghart Klotzer, Erich Wolff, Helmut Haseler
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Patent number: 4987059Abstract: Excellent image silver stability is obtained without intermediate washing after fixing and without a special finishing bath by a process for stabilizing a silver image produced by exposure, development and fixing of a photographic material containing at least one silver halide emulsion layer, in which, immediately after fixing, the photographic material is subjected to treatment by a stabilizing bath containing a compound corresponding to general formula (I) ##STR1## in which X=Cl, BrR.sup.1 =H, C.sub.1-4 alkyl, C.sub.6-10 aryl,R.sup.2 =CHO, COOH, COONa, CH.sub.2 COOH, CH.sub.2 COONa, CONR.sub.2.sup.3, CONHR.sup.3,R.sup.3 =H, C.sub.1-2 alkyl,and a compound corresponding to formula II ##STR2## and/or to formula III ##STR3## in which R.sup.3 and R.sup.4 may be the same or different and represent H, --NH.sub.2, alkyl, alkenyl, cycloalkyl, aryl, alkoxy, alkylthio, alkylsulfonyl, sulfamoyl, acyl, --SH or a heterocyclic group.Type: GrantFiled: November 17, 1989Date of Patent: January 22, 1991Assignee: Agfa-Gevaert AktiengesellschaftInventors: Werner Berthold, Helmut Haseler, Paul Marx, Heinz Meckl, Hans hischlager
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Patent number: 4939075Abstract: In the case of color materials with the usual processing times, bleaching and bleaching/fixing baths containing an iron(III) ion complex salt as bleach and, in addition, a 5- to 7-membered heterocyclic compound containing at least one N-atom and at least one other hetero atom from the group consisting of O,S,N which is substituted by --S.sup..crclbar. and, at a quaternary ring nitrogen atom, carries a positive charge arranged in such a way that no tautomeric charge compensation to a neutral thione form is possible, provide for good bleaching, i.e. for black areas free from residual silver in the case of color negative materials and for low minimum densities in the case of color reversal materials, by virtue of their excellent bleaching rate and, at the same time, their high stability.Type: GrantFiled: December 9, 1988Date of Patent: July 3, 1990Assignee: Agfa-Gevaert AktiengesellschaftInventors: Peter Bergthaller, Helmut Haseler, Heinz Meckl
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Patent number: 4933264Abstract: In a process for the processing of color photographic silver halide material which has been exposed to form an image by development, bleachfixing, washing or stabilization and drying, the aqueous developer solution being free from benzyl alcohol, the pH value of the bleachfixing solution, which contains an iron(III) complex salt, being below 7 and the bleachfixing solution containing a compound corresponding to general formula (I) ##STR1## in which Z represents the atoms required to complete an optionally further substituted heterocyclic ring andR.sup.1 represents hydrogen or an alkali atom,and a coupler containing an activated methylene group, in which a hydrogen atom is replaced by alkyl, cycloalkyl, aryl or aralkyl and reacts with the oxidation product of the color developer to form colorless reaction products, bleaching can be carried out free from residual silver with a low regeneration level of the bleachfixing bath without any water-insoluble precipitates being formed.Type: GrantFiled: August 18, 1989Date of Patent: June 12, 1990Assignee: Agfa-Gevaert AktiengesellschaftInventors: Helmut Haseler, Heinz Meckl, Gustav Tappe
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Patent number: 4636460Abstract: Photographic recording materials which contain a developer substance or a precursor thereof produce better results if in addition they contain a sulphite, a disulphite or a compound capable of releasing sulphite in the photographic material.Type: GrantFiled: June 11, 1985Date of Patent: January 13, 1987Assignee: Agfa Gevaert AktiengesellschaftInventors: Heinz Meckl, Helmut Kampfer, Helmut Haseler
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Patent number: 4615971Abstract: Developer compositions which contain a hydrolyzed polymaleic acid anhydride having improved protection against precipitation of calcium compounds.Type: GrantFiled: September 10, 1985Date of Patent: October 7, 1986Assignee: Agfa-Gevaert AktiengesellschaftInventor: Helmut Haseler
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Patent number: 4376216Abstract: A new process for the purification of photographic developer compounds using an anionic surfactant wherein unwanted impurities are removed either by being precipitated or dissolved.In this process the developer substance is freed from difficult to remove impurities.Type: GrantFiled: August 3, 1981Date of Patent: March 8, 1983Assignee: Agfa-Gevaert AGInventor: Helmut Haseler
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Patent number: 4297438Abstract: Color images are obtained by chromogenic development of a colorphotographic material comprising several differently spectrally sensitized silver halide emulsions and color couplers associated thereto, a hydrophobic cyan coupler being incorporated by means of a hydrophobic coupler solvent and a hydrophobic yellow coupler being incorporated without a coupler solvent, when a color developing composition is used comprising a hydrophilic and a hydrophobic color developer compound. The color images have good stability of the cyan partial image to tropical conditions and good lightfastness of the yellow partial image.Type: GrantFiled: July 27, 1979Date of Patent: October 27, 1981Assignee: AGFA-Gevaert AktiengesellschaftInventors: Helmut Haseler, Heinz Meckl, Karl Lohmer, Willibald Pelz
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Patent number: 4264717Abstract: Compounds of the formula ##STR1## are useful in photographic materials and processes for the color development.Type: GrantFiled: October 17, 1979Date of Patent: April 28, 1981Assignee: AGFA-Gevaert, A.G.Inventors: Helmut Haseler, Fritz Nittel
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Patent number: 4204867Abstract: White couplers which are capable of reacting with color developer oxidation products to form colorless end product with the consumption of four oxidation equivalents and which, therefore have increased absorption capacity for color developer oxidation products correspond to the formula ##STR1## or its tautomeric form, in which R.sup.1 is hydrocarbyl, heterocyclyl attached through a ring carbon, or --CO--R.sup.2R.sup.2 is alkyl, aryl, alkoxy, aminoX is --S-- or --NR.sup.3 --R.sup.3 is hydrogen, same as represented by R.sup.1 or an electron-attaching group.The four-equivalent white couplers may be contained in processing solutions or, in diffusion resistant form, in one or more layers of a colorphotographic material.Type: GrantFiled: February 10, 1978Date of Patent: May 27, 1980Assignee: AGFA-Gevaert, A.G.Inventors: Karl Kuffner, Wolfgang Lassig, Ernst Meier, Immo Boie, Gertrud Kirchhoff, Helmut Haseler, Herbert Stark
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Patent number: 4094448Abstract: The dosing device is installed between a funnel-shaped storage container for the pulverulent material and an open vessel underneath it. It consists of a flat plate arranged between the open vessel and the outlet aperture of the storage container so that a standing column of material is formed between this plate and the outlet aperture, and a dosing rod which is displaceable or rotatable in a horizontal plane. The dosing rod is passed periodically through the column of substance and with each passage conveys an approximately constant quantity of material into the vessel underneath it. This device is also capable of dosing materials which tend to stick together and cake to the apparatus.Type: GrantFiled: February 19, 1976Date of Patent: June 13, 1978Assignee: Agfa-Gevaert AktiengesellschaftInventors: Helmut Haseler, Gunter VON DER Kall
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Patent number: 4038079Abstract: Photographic bleach-fix baths containing iron-III-complexes of aminopolyacetic acids as oxidizing agents are rejuvenated by reducing the iron-III-complexes with a reducing agent other the iron and thereafter are desilvered by treatment with iron.Type: GrantFiled: August 21, 1975Date of Patent: July 26, 1977Assignee: AGFA-Gevaert AktiengesellschaftInventors: Heinz Meckl, Helmut Haseler, Adolf Seiler
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Patent number: 4014764Abstract: Photographic bleach fix baths are desilvered by electrolysis in a cell in which the cathode and anode chambers are separated by a diaphragm, with the exclusion of air, and the bleach fix bath is removed from the cell before the potential is switched off. For increasing the current yield the bleaching agent can be reduced prior to electrolysis for example by the addition of sodium dithionite.Type: GrantFiled: April 17, 1972Date of Patent: March 29, 1977Assignee: AGFA-Gevaert, A.G.Inventors: Adolf Seiler, Heinz Meckl, Helmut Haseler