Patents by Inventor Karl-Wilhelm Junge

Karl-Wilhelm Junge 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).

  • Process for the stabilization and antifogging of photographic silver halide emulsions
    Patent number: 4131470
    Abstract: A process for the stabilization of and the prevention or substantial reduction of fogging in the use of photographic silver halide emulsions, characterized in that compounds selected from the group consisting of those represented by the general formulas I, II, and III: ##STR1## are added to the emulsion, before or during chemical sensitization and before coating of the emulsions onto a support therefor, wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as herein described.
    Type: Grant
    Filed: December 21, 1976
    Date of Patent: December 26, 1978
    Assignee: VEB Filmfabrik Wolfen
    Inventors: Gunther Fischer, Beate Wenzel, Steffen Scheithauer, Udo Franz, Karl-Wilhelm Junge, Christof Schroter, Siegfried Gahler, Johannes Morgenstern
  • Silver-halide emulsion sensitized with an asymmetrical disulfide
    Patent number: 4120726
    Abstract: An improved photographic silver-halide emulsion containing a sensitizer additive which is an asymmetrical disulfide of the formula(W).sub.a (X).sub.b A--S--S--B(Y).sub.c (Z).sub.dwherein:A and B are each aryl, alkyl or aralkyl radicals,X and Y are each carboxyl or alkoxycarbonyl groups,W and Z are each amino groups which may be alkylated or acylated,a, b, c, d are each 0 to 3 anda + d .gtoreq. 1 and b + c .gtoreq. 1.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: October 17, 1978
    Assignee: VEB Filmfabrik Wolfen
    Inventors: Gerhard Hanisch, Gunther Fischer, Seigfried Gahler, Udo Franz, Karl Kuschel, Roland Mayer, Gunther Bach, Karl-Wilhelm Junge
  • Process of sensitizing silver halide emulsion with a dithioester
    Patent number: 4030928
    Abstract: Method for increasing the sensitivity of a photographic silver halide-gelatin emulsion comprising at the beginning of the chemical ripening adding to the emulsion of a dithioester of the formula: ##STR1## in which R is alkyl, .alpha.-hydroxyalkyl, .alpha.-hydroxyaralkyl, condensed aryl, or o- or p-substituted phenyl or .alpha.-naphthyl, the o- or p- located substituent being a F, OH, dialkylamino, sulfo, phenyl, phenylazo or anilidocarbonyl group and R.sub.1 is alkyl or aralkyl.
    Type: Grant
    Filed: November 18, 1975
    Date of Patent: June 21, 1977
    Assignee: VEB Filmfabrik Wolfen-Fotochemisches Kombinat
    Inventors: Siegfried Gahler, Karl-Wilhelm Junge, Gunther Fischer, Steffen Scheithauer, Horst Viola