Patents by Inventor Ruth Linda Hill

Ruth Linda Hill 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).

  • Spectrally sensitized photographic silver halide emulsion
    Patent number: 3932186
    Abstract: Improved green-sensitivity is imparted to a photosensitive silver halide emulsion by a benzimidazolothiacarbocyanine dye of the formula: ##SPC1##Wherein R.sup.1 and R.sup.2 are lower alkyl; R.sup.3 is sulfoalkyl or carboxyalkyl each having an alkylene chain of from 1 to 4 carbon atoms inclusive; R.sup.4 is hydrogen, halogen, lower alkyl, lower carbalkoxy, lower alkoxy or acetamido; R.sup.5 is halogen, cyano or carbalkoxy; R.sup.6 is hydrogen or halogen; Y is an anion customary in the cyanine dye art; and n is 0 or 1.
    Type: Grant
    Filed: January 2, 1974
    Date of Patent: January 13, 1976
    Assignee: Polaroid Corporation
    Inventors: Alan L. Borror, Ruth Linda Hill, Bernard Zuckerman