Patents by Inventor Werner Krafft
Werner Krafft 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: 5573897Abstract: A method is provided for applying a magnetic layer onto a polymeric sheet or web material comprising the steps of(i) simultaneously coextruding a non magnetic "dummy" layer and a magnetic layer onto said polymeric sheet or web material, said non magnetic "dummy" layer being closest to the support(ii) drying the coextruded layers characterised in that the sum of the wet coating thickness of said "dummy" layer (Th.sub.dum) and of the wet coating thickness of said magnetic layer (Th.sub.mag) fulfils the equation 25 .mu.m.ltoreq.Th.sub.dum +Th.sub.mag .ltoreq.100 .mu.m and that the ratio of (Th.sub.mag) to (Th.sub.dum) fulfils the equation 0.01.ltoreq.Th.sub.mag /Th.sub.dum .ltoreq.1.Type: GrantFiled: November 28, 1994Date of Patent: November 12, 1996Assignee: Agfa-Gevaert, N.V.Inventors: Hartwig Andries, Werner Krafft, Willem Mues, Jan Gilleir
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Patent number: 5443944Abstract: A photographic material comprising a transparent film support having on one side at least one light-sensitive layer and on the other side a transparent magnetic layer and an antistatic layer of a polythiophene arranged above or below said transparent magnetic layer shows transparency and good mechanical and antistatic properties.Type: GrantFiled: August 15, 1994Date of Patent: August 22, 1995Assignee: Agta-Gevaert AGInventors: Werner Krafft, Friedrich Jonas, Prem Lalvani, Hartwig Andries, Willem Mues
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Patent number: 5370981Abstract: Antistatically treated plastic formed articles, e.g. photographic film supports, that contain at least two layers on the surface to be antistatically treated, wherein a layer nearer to the plastic surface contains a preparation of a polythiophene that is built up from structural units of the formula ##STR1## wherein R.sub.1 and R.sub.2 independently of each other stand for hydrogen or a C.sub.1 -C.sub.4 -alkyl group or together form an optionally substituted C.sub.1 -C.sub.4 -alkylene group, preferably a methylene group optionally substituted by alkyl groups, a 1,2-ethylene group optionally substituted by C.sub.1 -C.sub.12 -alkyl or phenyl groups, a 1,3-propylene group or a 1,2-cyclohexylene group,and a polyanion, a farther layer contains a film-forming polymer and at least one of the two layers contains an alkoxysilane, are characterized, apart from excellent antistatic properties, by very good layer adhesion.Type: GrantFiled: March 24, 1993Date of Patent: December 6, 1994Assignee: Agfa-Gevaert AGInventors: Werner Krafft, Friedrich Jonas, Bavo Muys, Dirk Quintens
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Patent number: 5300575Abstract: The invention relates to dispersions of polythiophenes made up of structural units corresponding to the following formula ##STR1## in which R.sub.1 and R.sub.2 independently of one another represent hydrogen or a C.sub.1-4 alkyl group or, together, form an optionally substituted C.sub.1-4 alkylene group,in the presence of polyanions, to the production of these dispersions and to their use for the antistatic treatment of plastic mouldings.Type: GrantFiled: December 10, 1992Date of Patent: April 5, 1994Assignee: Bayer AktiengesellschaftInventors: Friedrich Jonas, Werner Krafft
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Patent number: 5070006Abstract: A photographic recording material comprising a support, at least one photosensitive, gelatine-containing silver halide emulsion layer on one side of the support and a gelatine-containing NC layer on the other side of the support, in which the NC layer contains a certain hydrophilic polymer, is distinguished by the fact that there is relatively little E.sub.a curl during drying whereas sufficient E.sub.i curl is present after drying, so that the material is not damaged during processing.Type: GrantFiled: April 26, 1991Date of Patent: December 3, 1991Assignee: Agfa Gevaert AGInventors: Werner Krafft, Gunter Helling, Gunter Matschke
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Patent number: 4738919Abstract: A photographic recording material containing at least one pyrazolone in at least one non-photosensitive layer I, a compound Sc, which reacts with the oxidation product of a p-phenylene diamine developer to form substantially colorless products and which is contained in a non-photosensitive layer which is not separated from the layer I by a photosensitive silver halide emulsion layer, shows improved protection against formaldehyde.Type: GrantFiled: December 11, 1986Date of Patent: April 19, 1988Assignee: Agfa Gevaert AktiengesellschaftInventors: Gerd Krauss, Gunter Renner, Erich Wolff, Hans Langen, Werner Krafft
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Patent number: 4440849Abstract: The invention relates to a process for the production of colored images by the dye diffusion transfer principle, in which a color photographic recording material containing negative silver halide emulsions and reducible color-providing compounds is developed with an alkaline developer preparation containing a combination of at least one compound from each of at least two of the groups of compounds (A, B, C) defined below as development accelerators. With combinations of this type, equal or higher maximum color densities are obtained for a smaller overall quantity of development accelerator.A: a 1,3-diol containing from 3 to 10 carbon atomsB: a cyclohexane dimethanol or cyclohexene dimethanolC: an aryl alkanol or aroxyalkanol containing from 7 to 12 carbon atoms.Type: GrantFiled: June 21, 1982Date of Patent: April 3, 1984Assignee: Agfa-Gevaert AktiengesellschaftInventor: Werner Krafft
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Patent number: 4379829Abstract: A color photographic material for the dye diffusion transfer process contains a temporary barrier layer that is applied from organic solution and consists of a mixture of(a) 40 to 95% by weight of a copolymer of 40 to 80% by weight of monomer I (vinylidene chloride, dimethyl butadiene or dichlorobutadiene) 18 to 50% by weight of monomer II ((meth)acrylonitrile or alkyl (meth)acrylate) and 2 to 10% by weight of monomer III (olefinically unsaturated copolymerizable mono or dicarboxylic acids, sulfonic acids or phosphonic acids) and(b) 5 to 60% by weight of a homopolymer of alkyl acrylate, hydroxyalkyl acrylate, N-alkyl acrylamide, N-hydroxyalkyl acrylamide vinyl acetate, or polycarbonate or cellulose acetate, or a copolymer of 80 to 99% by weight of alkyl or hydroxyalkyl acrylate and 1 to 20% by weight of a copolymerizable acid.Type: GrantFiled: January 2, 1981Date of Patent: April 12, 1983Assignee: Agfa-Gevaert AktiengesellschaftInventors: Werner Krafft, Gunter Helling, Guunther Matschke, Immo Boie
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Patent number: 4284708Abstract: A photographic film unit for the production of colored transfer images contains an integral neutralization system consisting of an acid polymer layer and a retarding layer. The acid polymer layer consists of a copolymer of 5 to 50 % by weight of polymerized carboxyalkyl (meth)acrylate units together with other acid monomers and optionally nonacid monomers. A preferred carboxyalkyl (meth)acrylate is the dimeric acrylic acid. The acid polymer has high acid number and low glass transition temperature.Type: GrantFiled: March 19, 1980Date of Patent: August 18, 1981Assignee: Agfa-Gevaert AktiengesellschaftInventors: Gunter Helling, Werner Krafft, Kurt Findeisen, Wolfgang Himmelmann
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Restraining layer for retarding the diffusion of hydroxyl ions in the dye diffusion transfer process
Patent number: 4148653Abstract: A restraining layer capable of retarding the diffusion of hydroxyl groups is of particular use in a neutralization system for the dye diffusion transfer process. The restraining layer of the invention comprises a film-forming linear polymer consisting of alternating hydrophilic and hydrophobic segments joined to one another by carbonate, urethane and/or ester groups. The neutralization system provides retarded reduction of pH in the photographic material.Type: GrantFiled: January 12, 1977Date of Patent: April 10, 1979Assignee: AGFA-Gevaert AGInventors: Wulf von Bonin, Erich Wolff, Werner Krafft, Gunther Matschke -
Patent number: 4138260Abstract: The neutralization layer (acid polymer layer) in a photographic film unit for the production of colored transfer images contains a crosslinked acrylic or methacrylic acid copolymer having at least 30 mol % of copolymerized acrylic acid or methacrylic acid and the crosslinking has been brought about by copolymerizing said acid monomers or the corresponding esters together with a crosslinking agent having at least two copolymerizable carbon-carbon double bands.Type: GrantFiled: November 14, 1977Date of Patent: February 6, 1979Assignee: Agfa-Gevaert AktiengesellschaftInventors: Werner Krafft, Gunter Helling
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Patent number: 4104067Abstract: Copolymers of methylacrylate/alkyl acrylate or methyl methacrylate/alkyl methacrylate are used as a binder for UV-sensitive recording materials, preferably recording materials which contain substances which are capable of discoloration.Type: GrantFiled: January 23, 1975Date of Patent: August 1, 1978Assignee: AGFA-Gevaert, AGInventors: Werner Krafft, Gunther Arnold, Gabor Paal, Hans-Peter Vollmer
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Patent number: 4088493Abstract: A neutralization system for the dye diffusion transfer process comprises an acid polymer layer containing a polymer with free acid groups and a retarding layer. The retarding layer contains a hydratable polymer which in its non-hydrated state is a barrier for hydroxyl ions and in its hydrated state provides no resistance for diffusing hydroxyl ions. The retarding layer is arranged between a laminate consisting of a light-sensitive film unit comprising at least a light-sensitive silver halide emulsion layer and a non-diffusible dye giving compound associated with the light-sensitive silver halide emulsion layer. The retarding layer allows a first high pH value to be maintained during a first time interval which is sufficient and necessary for producing the desired image density in the image receiving layer and thereafter a second low pH value to be adjusted within a second time interval which is less than half as long as the first.Type: GrantFiled: November 20, 1975Date of Patent: May 9, 1978Assignee: Agfa-Gevaert AktiengesellschaftInventors: Werner Krafft, Gunther Matschke, Erich Wolff
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Patent number: 4056397Abstract: In a photographic monosheet material for the dye diffusion transfer process a temporary bond is adjusted between a first layer and a second layer by placing between said layers another layer of a graft polymer which is obtained by grafting a monomer containing double bonds capable of radical polymerization onto a hydrophilic linear basis polymer. The two layers are firmly bonded to each other but are easily separated, when the processing liquid is forced between them.Type: GrantFiled: November 5, 1975Date of Patent: November 1, 1977Assignee: AGFA-Gevaert, A.G.Inventors: Werner Krafft, Erich Wolff, Wulf VON Bonin
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Patent number: 4030926Abstract: A storage medium for optical data recording comprises a dye-forming combination which on exposure to light within a first range of wavelengths reacts irreversibly to form a dye, but is substantially insensitive to light within a second range of wavelengths which is capable of energizing the dye to produce luminescence. The dye-forming combination consists of a heterocyclic compound of the formula I and of a cyclic dihalodicarbonyl compound of the formula II ##STR1## The symbols are defined in the specification. An example of formula I is benzofuran and an example of formula II is dibromomaleic anhydride.Type: GrantFiled: July 7, 1975Date of Patent: June 21, 1977Assignee: AGFA-Gevaert, A.G.Inventors: Kurt-Rainer Stahlke, Werner Krafft, Rudolf Meyer, Hans Jurgen Rosenkranz
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Patent number: 3985561Abstract: A process for producing continuous tone images on an image-receiving material in a diffusion transfer process.Type: GrantFiled: June 20, 1974Date of Patent: October 12, 1976Assignee: AGFA-GEVAERT N.V.Inventors: Louis Maria De Haes, Leon Louis Vermeulen, Hugo Karel Gevers, Stephan Jeanne Bongaerts, Paul Desire Van Pee, Werner Krafft