Patents by Inventor Donald Richard Diehl

Donald Richard Diehl 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).

  • Patent number: 5834173
    Abstract: A photographic element contains a dye of Formula (I): ##STR1## wherein G represents O or dicyanovinyl (--C(CN).sub.2); E.sup.1 represents an electron withdrawing group; R.sup.1 represents a substituted or unsubstituted aryl group or a substituted or unsubstituted hetereoaryl group; L.sup.1, L.sup.2 and L.sup.3 each independently represent substituted or unsubstituted methine groups; Z represents non-metal atoms which may be assembled to form a five- or six-membered heterocyclic ring other than furan; and n represents 0 or 1; and wherein the dye comprises at least one ionizable group with a pKa value between 4 and 12.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: November 10, 1998
    Assignee: Eastman Kodak Company
    Inventors: Margaret Jones Helber, Donald Richard Diehl, Terrence Robert O'Toole
  • Patent number: 5674669
    Abstract: A photographic element having a support and a layer containing first and second oxonol dyes, the first dye being a monomethine pyrazolone oxonol dye with each pyrazolone ring having a 1-phenyl group bearing an ortho-substituent selected from sulfo, sulfato, hydroxy, or nitro substituent, and the second dye being a tri- or penta-methine oxonol dye. A method of making a photographic element is also provided. The method comprises maintaining a mixture of at least such a first dye in a carrier medium at a temperature of at least 30.degree. C. for 0.5 hour.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: October 7, 1997
    Assignee: Eastman Kodak Company
    Inventors: Elizabeth Ann Gallo, Donald Richard Diehl