Patents by Inventor Alexis S. Zinn-Warner

Alexis S. Zinn-Warner 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