Patents by Inventor Detlef Brennecke

Detlef Brennecke 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: 5830628
    Abstract: A colour photographic silver halide material with at least two blue-sensitive, yellow-coupling silver halide emulsion layers of differing photographic sensitivity, at least two green-sensitive, magenta-coupling silver halide emulsions layers of differing photographic sensitivity and at least two red-sensitive, cyan-coupling silver halide emulsion layers of differing photographic sensitivity, at least one interlayer Z-1 below the lowermost red-sensitive silver halide emulsion layer and/or at least one interlayer Z-2 below the lowermost green-sensitive silver halide emulsion layer, in which material a coupler is additionally used in at least one silver halide emulsion layer, which coupler couples to yield a colour which is not complementary to the spectral sensitisation of the layer concerned, and Z-1 and/or Z-2 contain a silver halide emulsion which has tabular grains with an aspect ratio of >2, an average diameter of a sphere of equal volume of .gtoreq.0.3 .mu.
    Type: Grant
    Filed: July 10, 1996
    Date of Patent: November 3, 1998
    Assignee: Agfa-Geuaert
    Inventors: Hans-Ulrich Borst, Detlef Brennecke, Ralf Buscher, Johannes Willsau, Peter Bell
  • Patent number: 5599657
    Abstract: A colour photographic silver halide material with a support, at least one red-sensitive silver halide emulsion layer containing at least one cyan coupler, at least one green-sensitive silver halide emulsion layer containing at least one magenta coupler, at least one blue-sensitive silver halide emulsion layer containing at least one yellow coupler, at least one interlayer Z-1 beneath the lowermost red-sensitive silver halide emulsion layer and/or at least one interlayer Z-2 beneath the lowermost green-sensitive silver halide emulsion layer, in which Z-1 and/or Z-2 contains a silver halide emulsion which contains tabular grains with an aspect ratio of>2, an average diameter of a sphere of equal volume of.gtoreq.0.3 .mu.m and a diameter of a circle of equal projected surface area of the tabular grains of at least 0.3 .mu.m, is distinguished by improved red and/or green sensitivity.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: February 4, 1997
    Assignee: Agfa-Gevaert AG
    Inventors: Detlef Brennecke, Johannes Willsau, Ralf B uscher, Hans-Ulrich Borst, Peter Bell, Lothar Endres
  • Patent number: 5498518
    Abstract: A process is disclosed for the preparation of a chloride rich tabular grain emulsion having (100) major crystal faces, characterized in that the precipitation is performed in the presence of a phenylmercaptotetrazole compound.The scope of the invention further comprises photographic materials comprising an emulsion thus prepared.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: March 12, 1996
    Assignee: Agfa-Gevaert, N.V.
    Inventor: Detlef Brennecke
  • Patent number: 5360704
    Abstract: A camera-sensitive color photographic recording material which comprises 2 or 3 green-sensitive layers, 2 or 3 red-sensitive layers and 2 or 3 blue-sensitive layers, the blue-sensitive layers being arranged further from the support than the green-sensitive and red-sensitive layers, the layer of low blue-sensitivity or the layer of low blue sensitivity and the layer of medium blue sensitivity being made up of silver halide emulsions containing at least 50 mol-% AgCl and the total silver coating of the material being adjusted as a function of sensitivity to a value which satisfies the following relation:Ag coating=(0.27.multidot.S)-X,the silver coating being determined in g/m.sup.2, X having a value of 1.9 to 3.8 and S being the sensitivity in DIN, is distinguished by improved sharpness.
    Type: Grant
    Filed: July 7, 1993
    Date of Patent: November 1, 1994
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventor: Detlef Brennecke