Patents by Inventor Rudolf Stolzenburg

Rudolf Stolzenburg 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).

  • Patent number: 5021330
    Abstract: High edge effects and interimage effects are obtained when DIR couplers of formula I are used in color photographic silver halide materials. ##STR1## In Formula I, R.sup.1 denotes alkyl, for example C.sub.4 H.sub.9 -t, aryl, for example p-alkoxyphenyl, NH-aryl or NH--NH--R.sup.3 ;R.sup.2 denotes H, halogen, e.g. chlorine, alkoxy, alkylthio or NH--R.sup.4 ;R.sup.3 and R.sup.4 denote acyl;X denotes the residue of a photographically active compound containing a monocyclic 1,2,3- or 1,2,4-triazole ring,TIME denotes a linking member andn denotes 0 or 1.
    Type: Grant
    Filed: July 18, 1990
    Date of Patent: June 4, 1991
    Assignee: Agfa Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Thomas Kruger, Rudolf Stolzenburg, Dirk Hubner
  • Patent number: 4870000
    Abstract: A color photographic recording material containing a coupler which releases a photographically active compound.Couplers corresponding to formula (I) couple with color developers to form yellow to yellow-orange dyes and, in doing so, release the residue X as a photographically active compounds. Where X is a development inhibitor, remarkably high inter-image and edge effects can be obtained. ##STR1## in which R.sup.1 represents alkyl, a heterocyclic or carbocyclic aromatic group or -NH-CO-R.sup.2 ;R.sup.2 represents alkyl, aryl or -NH-R.sup.3 ;R.sup.3 represents alkyl or aryl;Q represents the groups to complete a fused, optionally substituted benzene or heterocyclic ring;X represents the residue of a photographically active compound;TIME represents a bond which, on reaction of the coupler with the oxidation product of a color developer, is released together with the residue X attached thereto and, in turn, releases the residue X as a photographically active compound under the development conditions;n=0 or 1.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: September 26, 1989
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Rudolf Stolzenburg, Dirk Hubner
  • Patent number: 4767698
    Abstract: Cyan partial color images with increased light fastness and improved stability to moisture and heat may be produced by the dye diffusion process using cyan dyes corresponding to formula I released from dye releasing compounds. ##STR1## In the above formula, Q denotes a group for completing a pyridine or pyridazine ring optionally carrying a condensed aromatic ring;G denotes OH or NH--SO.sub.2 --R.sup.5 ;R.sup.1 denotes H or one, two or three substituents;R.sup.2 denotes H or a group with electron acceptor character preferably situated in an ortho-position to G;R.sup.3 denotes H, acylamino or a group such as G;R.sup.4 denotes H, SO.sub.2 --NR.sup.6 --R.sup.7 or NH--SO.sub.2 --R.sup.5 ;R.sup.5 denotes alkyl, aralkyl, aryl or NR.sup.6 --R.sup.7 ;R.sup.6, R.sup.7 denote H, alkyl or aralkyl or together form a group for completing a cyclic amino group.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: August 30, 1988
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Rudolf Stolzenburg, Paul Marx
  • Patent number: 4579805
    Abstract: Dyes corresponding to formula I may be released imagewise from dye releasers in the dye diffusion transfer process. The dyes obtained are lightfast cyan dyes with improved spectral properties and reduced sensitivity to reducing agents ##STR1## the meanings of symbols given in formula I (A, A', G, R.sup.1, R.sup.2, R.sup.3 and R.sup.4) are indicated in the description.
    Type: Grant
    Filed: November 23, 1984
    Date of Patent: April 1, 1986
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Hauke Furstenwerth, Rudolf Stolzenburg, Paul Marx, Holger Heidenreich
  • Patent number: 4559296
    Abstract: New dyes corresponding to the following general formula: ##STR1## wherein the substituents are as defined in the specification, are suitable for use in photographic recording materials.
    Type: Grant
    Filed: April 25, 1984
    Date of Patent: December 17, 1985
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Lothar Rosenhahn, Karl J. Herd, Hauke Fuerstenwerth, Rudolf Stolzenburg
  • Patent number: 4524124
    Abstract: Monoazo dyes corresponding to the following formula ##STR1## are suitable for use as light-stable cyan image dyes stable to reducing agents for the dye diffusion transfer process.In the above formula:Q represents the remainder of the molecule required to complete a fused benzene or thiophene ring, which contains additional electron acceptor groups, or to complete a fused pyridine, pyrimidine, pyridazine, pyrazine or thiazole ring;G represents --OH, acyloxy;R.sup.1 represents H or one or two identical or different radicals selected from the group consisting of halogen, acyl, acylamino and --CN;Y represents H, --OH, an amino group optionally substituted by alkyl or aryl, a cyclic amino group or a group of the formula --NH--SO.sub.2 --R.sup.2 ;R.sup.2 represents alkyl, aryl, an amino group optionally substituted twice by alkyl or a cyclic amino group;n=0, 1 or 2.
    Type: Grant
    Filed: June 18, 1984
    Date of Patent: June 18, 1985
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Rudolf Stolzenburg, Paul Marx, Rainer Hamprecht
  • Patent number: 4521506
    Abstract: Azo dyes corresponding to the formula (I): ##STR1## wherein R.sup.1 represents a releasable group, R.sup.2 represents H, halogen or sulphonyl, R.sup.3 and R.sup.4 represent H or groups not capable of chelate formation, and Q represents a group for completing a phenyl or naphthyl group,combine with nickel ions to form stable azo dye-metal complexes which have advantageous spectral properties. They are therefore particularly suitable for the production of highly light-fast magenta images, e.g. by the ink jet process, in which they may be used directly in the form of colored inks, or by the dye diffusion transfer process, in which they are released imagewise from suitable dye-releasers in the course of development and transferred to a dye-receptive layer.
    Type: Grant
    Filed: June 5, 1984
    Date of Patent: June 4, 1985
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Rudolf Stolzenburg, Peter Bergthaller, Gerhard Wolfrum, Jurgen Strauss
  • Patent number: 4393132
    Abstract: For the production of light-fast yellow images (transfer images and retained images) by the dye diffusion transfer process dye-releasers are useful which on development release diffusible azo dyes which can complex with nickel or copper ions and which in one of their tautomeric forms correspond to the general formula: ##STR1## wherein R.sup.1 represents alkyl, alkenyl or cycloalkyl having up to 8 carbon atoms,Z represents a radical required for completing a benzene or naphthalene ring; andL represents a substituent having a group which results from the splitting from a carrier radical.
    Type: Grant
    Filed: April 23, 1982
    Date of Patent: July 12, 1983
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Gunther Schenk, Peter Bergthaller, Gerhard Wolfrum, Rudolf Stolzenburg
  • Patent number: 4195992
    Abstract: Non-diffusible dye-providing components which may be used in association with a silver halide emulsion layer and on development yield diffusible yellow dyes of improved light fastness are cyanalkyl aminoazo dyes of the formula ##STR1## in which A.sup.1 represents oxidizable carrier residue;D represents a heterocyclic or carbocyclic aromatic residue completing an azo dye; and1, m and n are 0 or 1 such that1+m+n=1;and r represents an integer of from 1 to 4.
    Type: Grant
    Filed: July 18, 1978
    Date of Patent: April 1, 1980
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Rudolf Stolzenburg, Paul Marx, Walter Puschel
  • Patent number: 4139383
    Abstract: Non-diffusible dye-providing compounds for the dye diffusion transfer process yielding yellow to red color images of wanted absorption characteristics and improved light fastness correspond to the formula(A.sup.1).sub.n -- D -- N .dbd. N -- Py -- (A.sup.1).sub.1-nin whichA.sup.1 represents an oxidizable organic carrier residue which may be attached through a connecting member X and containing a group which confers diffusion resistance, from which carrier residue, either in its oxidized or in its unoxidized form, a part is split off together with the group which confers diffusion resistance under alkaline photographic development conditions, a diffusible azo dye represented by the formula P--N.dbd.N--B being released imagewise at the same time;D represents a heterocyclic or carbocyclic aromatic group;Py represents a pyridine or 1,2-dihydropyridine group which is attached to the azo group through its 3-position and carries an amino or hydroxyl group in its 6-position;N = 0 or 1.
    Type: Grant
    Filed: November 14, 1977
    Date of Patent: February 13, 1979
    Assignee: AGFA-Gevaert AG
    Inventors: Heinrich Odenwalder, Walter Puschel, Rudolf Stolzenburg