Patents by Inventor Uwe Dahlhaus

Uwe Dahlhaus 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: 6451520
    Abstract: A colour photographic silver halide material comprising a support and at least one silver halide emulsion layer which is deposited thereon and which contains at least one colour coupler, characterised in that said layer also contains a compound of formula (I) wherein R1 denotes alkyl, aryl, aralkyl or hetaryl, R2 denotes H or R1, or R1 and R2 together denote the remaining members of a heterocyclic ring, R3, R4, independently of each other, denote aryl or hetaryl or together denote the remaining members of a phenanthrene ring which is condensed-on in the 9,10-position, wherein R1 can also be H if R3 and R4 together form a phenanthrene ring, is distinguished by improved granularity.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: September 17, 2002
    Assignee: Agfa-Gevaert
    Inventors: Heinrich Odenwälder, Hans Langen, Uwe Dahlhaus
  • Publication number: 20020045138
    Abstract: A color photographic silver halide material comprising a support and at least one silver halide emulsion layer which is deposited thereon and which contains at least one color coupler, characterized in that said layer also contains a compound of formula (I) 1
    Type: Application
    Filed: July 27, 2001
    Publication date: April 18, 2002
    Inventors: Heinrich Odenwalder, Hans Langen, Uwe Dahlhaus
  • Patent number: 6297385
    Abstract: The present invention relates to new yellow couplers of formula (I) for colour photographic materials wherein R1 represents alkyl or hetaryl, R2 represents halogen, alkoxy, aryloxy, R3 represents alkoxycarbonyl (—COOR′), carbamoyl (—CONHR′R″), urethane (—NHCOOR′), R4 represents a substituent, R5 represents alkyl or aryl, and R6 represents hydroxy-(ethyloxy)n, where n=1 to 2 and to a colour photographic material containing said couplers of formula (I).
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: October 2, 2001
    Assignee: AGFA-Gevaert
    Inventors: Uwe Dahlhaus, Hans Langen, Heinz Wiesen
  • Patent number: 6013428
    Abstract: A colour photographic recording material having at least one red-sensitive silver halide emulsion layer which is associated with a cyan coupler, at least one green-sensitive silver halide emulsion layer which is associated with a magenta coupler, at least one blue-sensitive silver halide emulsion layer which is associated with a yellow coupler contains in at least one green-sensitive silver halide emulsion layer a 2-equivalent pyrazolone coupler and in a photosensitive or non-photosensitive layer a white coupler of the formula (I) ##STR1## in which X.sup.1 means an acyl residue derived from an aliphatic, cycloaliphatic or aromatic carboxylic or sulphonic acid, a carbonic acid semi-ester or a carbamic acid,Z means the residue required to complete a saturated or partially unsaturated 5- or 6-membered carbocyclic ring which is optionally substituted and/or provided with a further fused ring or ring system.
    Type: Grant
    Filed: July 11, 1997
    Date of Patent: January 11, 2000
    Assignee: Agfa-Gevaert AG
    Inventors: Hans Langen, Heinrich Odenwalder, Uwe Dahlhaus
  • Patent number: 5702877
    Abstract: A colour photographic silver halide material with a support, at least one silver halide emulsion layer and at least one non-light sensitive layer applied thereto, wherein the silver halide emulsion layer contains at least one colour coupler, and wherein the silver halide emulsion layer or the non-light sensitive layer contains a compound of the formula (I) ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 mean hydrogen or an organic residue andn means 0 or an integer from 1 to 4 orR.sub.1 and R.sub.2 together, R.sub.1 and an adjacent residue R.sub.3 together or two adjacent residues R.sub.3 together form a carbocyclic or heterocyclic ring with 5 to 7 ring atoms orR.sub.1, R.sub.2 or R.sub.3 mean a bridging member by means of which two compounds of the formula (I) are attached together orR.sub.1, R.sub.2 or R.sub.3 are attached to a polymer via a bridging member,wherein at least one of the substituents R.sub.1, R.sub.2 and R.sub.3 is an organic residue,is distinguished by improved grain.
    Type: Grant
    Filed: February 26, 1996
    Date of Patent: December 30, 1997
    Assignee: Agfa-Gevaert AG
    Inventors: Heinrich Odenwalder, Hans Langen, Uwe Dahlhaus, Heinz-Dieter Schutz
  • Patent number: 5601968
    Abstract: A color photographic silver halide material with a support and at least one silver halide emulsion layer applied thereto which contains at least one 2-equivalent pyrazolone magenta coupler of the formula (I) ##STR1## with the substituents having the meanings stated in the specification and at least one amine which contains repeat units of the formulae (II) or (III) ##STR2## with the substituents having the meanings stated in the specification, is distinguished by reduced fogging and color spotting during storage.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: February 11, 1997
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Beate Weber, Hans Langen, Uwe Dahlhaus, Thomas H ubsch