Patents by Inventor Stephen R. Herchen

Stephen R. Herchen 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).

  • Thermal imaging with ylide dyes
    Patent number: 4894358
    Abstract: Disclosed is a class of dyes that can be rendered colorless by the application of heat in a silverless imaging system and which have utility in information recording and display, color hard copy and photographic systems. Certain dye ylides, for example, xanthane dye ylides are disclosed which when incorporated in a thin film can be imagewise heated to develop an image by reason of the ylide dye disassociating in the areas where heated and thereby being rendered colorless.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: January 16, 1990
    Assignee: Polaroid Corporation
    Inventors: Michael P. Filosa, Stephen R. Herchen, Cheryl P. Petersen
  • Novel image dye-providing materials and photographic products and processes
    Patent number: 4598158
    Abstract: Diffusion transfer photographic color processes and products are described utilizing novel image dye-providing materials which provide image dyes having the chromophoric system represented by the formula ##STR1## wherein X is ##STR2## or --SO.sub.2 --R.sub.1 ; Z is H, alkyl or aryl; R is H, alkyl or aryl; DYE is any dye moiety; R.sub.1 is H, alkyl, aryl, --NH.sub.2, --NHR.sub.2, --N(R.sub.2).sub.2 or --OR.sub.2 ; R.sub.2 is H, alkyl or aryl; and m is 1 or 2. The image dye providing material includes a diffusion control moiety such as a hydroquinonyl group or a precursor thereof and may be diffusible or nondiffusible as a function of the diffusion control moiety.
    Type: Grant
    Filed: January 10, 1983
    Date of Patent: July 1, 1986
    Assignee: Polaroid Corporation, Patent Dept.
    Inventors: Stephen R. Herchen, Gary N. Widiger
  • Thiazolidine-substituted phenyl sulfonamides
    Patent number: 4415737
    Abstract: This invention is concerned with certain 3-(thiazolidin-2'-yl)-substituted phenyl sulfonamides which find utility as intermediates in the preparation of photographic image dye-providing materials.
    Type: Grant
    Filed: December 20, 1982
    Date of Patent: November 15, 1983
    Assignee: Polaroid Corporation
    Inventors: Stephen R. Herchen, David Messersmith
  • Novel image dye-providing materials and photographic products and processes
    Patent number: 4386150
    Abstract: Diffusion transfer photographic color processes and products are described utilizing novel image dye-providing materials which provide image dyes having the chromophoric system represented by the formula ##STR1## wherein X is ##STR2## or --SO.sub.2 --R.sub.1 ; Z is H, alkyl or aryl; R is H, alkyl or aryl; DYE is any dye moiety; R.sub.1 is H, alkyl, aryl, --NH.sub.2, --NHR.sub.2, --N(R.sub.2).sub.2 or --OR.sub.2 ; R.sub.2 is H, alkyl or aryl; and m is 1 or 2. The image dye providing material includes a diffusion control moiety such as a hydroquinonyl group or a precursor thereof and may be diffusible or nondiffusible as a function of the diffusion control moiety.
    Type: Grant
    Filed: December 18, 1981
    Date of Patent: May 31, 1983
    Assignee: Polaroid Corporation
    Inventors: Stephen R. Herchen, Gary N. Widiger