Patents by Inventor Karl E. Wiegers

Karl E. Wiegers 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).

  • Photographic compositions and elements including internal latent image silver halide grains and nucleating agents therefor
    Patent number: 4737439
    Abstract: A radiation-sensitive composition including silver halide grains capable of forming an internal latent image and a nucleating agent is useful as a coating on a support to form a photographic element.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: April 12, 1988
    Assignee: Eastman Kodak Company
    Inventors: John P. Freeman, Roy L. Orvis, Richard L. Parton, Karl E. Wiegers
  • Application of activated arylhydrazides to silver halide photography
    Patent number: 4478928
    Abstract: The use of sulfinic acid radical substituted arylhydrazides in producing images in silver halide photographic elements is disclosed. The sulfinic acid radical substituted arylhydrazide can be incorporated in photographic silver halide, emulsions, and photographic elements. The sulfinic acid radical substituent is capable of activating the arylhydrazides, particularly for use at a lower alkaline pH. In negative working surface latent image forming emulsions the sulfinic acid radical substituted arylhydrazides permit higher speed or contrast to be achieved. In direct positive internal latent image forming emulsions increased nucleation activity and reduced rereversal can be achieved.
    Type: Grant
    Filed: May 11, 1983
    Date of Patent: October 23, 1984
    Assignee: Eastman Kodak Company
    Inventors: Thomas C. Hess, Karl E. Wiegers
  • Silver halide emulsions and photographic elements containing adsorbable alkynyl substituted heterocyclic quaternary ammonium salts
    Patent number: 4471044
    Abstract: The use of thioamido and alkynyl substituted heterocyclic ammonium salts in producing images in silver halide photographic elements is disclosed. The thioamido and alkynyl substituted heterocyclic ammonium salts can be incorporated in photographic silver halide emulsions. The thioamido substituent is capable of promoting adsorption of these salts to silver halide grain surfaces. In negative working surface latent image forming emulsions the thioamido and alkynyl substituted heterocyclic ammonium salts permit higher speeds to be achieved. In direct positive internal latent image forming emulsions nucleation activity and improved incubation stability can be achieved.
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: September 11, 1984
    Assignee: Eastman Kodak Company
    Inventors: Richard L. Parton, Wilbur S. Gaugh, Karl E. Wiegers
  • Adsorbable alkynyl substituted heterocyclic quaternary ammonium salts and applications thereof to silver halide photography
    Patent number: T105001
    Abstract: The use of thioamido and alkynyl substituted heterocyclic ammonium salts in producing images in silver halide photographic elements is disclosed. The thioamido and alkynyl substituted heterocyclic ammonium salts can be incorporated in photographic silver halide emulsions. The thioamido substituent is capable of promoting adsorption of these salts to silver halide grain surfaces. In negative working surface latent image forming emulsions the thioamido and alkynyl substituted heterocyclic ammonium salts permit higher speeds to be achieved. In direct positive internal latent image forming emulsions nucleation activity and improved incubation stability can be achieved.
    Type: Grant
    Filed: February 27, 1984
    Date of Patent: January 1, 1985
    Inventors: Richard L. Parton, Wilbur S. Gaugh, Karl E. Wiegers