Patents by Inventor Charles G. Barlow

Charles G. Barlow 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).

  • Image toners for silver halide photographic films
    Patent number: 5922527
    Abstract: A black-and-white, negative-acting, silver halide emulsion is described which gives improved image tone when used in a photographic element. The toning agents are based on dithio-substituted compounds having the following general structures: ##STR1## where R.sub.1 and R.sub.2, independently, are selected from the group consisting of alkyl, aryl and heterocyclic groups, or R.sub.1 and R.sub.2 together complete a ring;n and m are integers from 1 to 5; Y is a hydrogen; R.sub.3 is a hydrogen or alkyl group;and X is selected from the group consisting of O, S, N--OH and N--N(R).sub.2, where R is a hydrogen or alkyl group.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: July 13, 1999
    Assignee: Imation Corp.
    Inventors: Charles G. Barlow, Richard R. Ollmann, Alexis S. Zinn-Warner, Robert J. D. Nairne, A. L. Beck, Andrew Mott
  • Noble metal complexes to sensitize silver halide emulsions
    Patent number: 5556742
    Abstract: Silver halide photographic emulsions may be sensitized by the use of hydrido-phosphine noble metal compounds and especially platinum (II) compounds.
    Type: Grant
    Filed: August 30, 1995
    Date of Patent: September 17, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles G. Barlow, Peter R. Johns, Peter D. Sills
  • Infra-red sensitizing dyes for silver halide
    Patent number: 5041550
    Abstract: Infra-red sensitizing dyes for silver halide having a nucleus of the general formula: ##STR1## in which Q represents Cl or Br,R.sup.3 represents an alkyl or substituted alkyl,n is 0, 1, 2 or 3,X is an anion of molecular weight up to 400 which may be incorporated in one R.sup.3 group.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: August 20, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Bernard A. Lea, Ronald W. Burrows, Thomas D. G. Hellings, Charles G. Barlow, Ivan H. Skoog
  • Method for forming printing plates and plate-making element
    Patent number: 5032486
    Abstract: A method for making printing plates wherein free radicals generated in a metallic silver image migrate into an image-receiving layer which comprises a free radical polymerizable polymer, thereby forming a printing image of hardened polymer in the image-receiving layer. Also, plate-making elements which may be used in such method to make lithographic printing plates.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: July 16, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles G. Barlow, Michael G. Weeks
  • Infra-red sensitising dyes for silver halide
    Patent number: 4959294
    Abstract: Infra-red sensitizing dyes for silver halide having a mucleus of the general formula: ##STR1## in which: Q represents Cl or Br,R.sup.3 represents an alkyl or substituted alkyl,n is 0, 1, 2 or 3,X is an anion of molecular weight up to 400 which may be incorporated in one R.sup.3 group.
    Type: Grant
    Filed: April 14, 1988
    Date of Patent: September 25, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Bernard A. Lea, Ronald W. Burrows, Thomas D. G. Hellings, Charles G. Barlow, Ivan H. Skoog