Patents by Inventor Dinesh P. Patel

Dinesh P. Patel 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).

  • Chemically stable ascorbate-based photographic developer and imaging process
    Patent number: 5589323
    Abstract: The invention comprises a process for forming a high contrast photographic image including the steps of imagaewise exposing a silver halide photographic element containing a hydrazine compound which functions as a nucleating agent, wherein the element is free of incorporated amine boosters. The exposed element is developed with a chemically stable aqueous alkaline developing solution that is free of dihydroxybenzene developing agents and has a pH between 9.5 and 11. The developing solution comprises an ascorbic acid developing agent; an auxiliary developing agent; and a combination of an alkali metal carbonate and an alkali metal borate comprising between 0.125 and 0.5 molar concentration of the carbonate and between 0.04 and 0.35 molar concentration of the borate.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: December 31, 1996
    Assignee: Sun Chemical Corporation
    Inventors: John L. Adkins, Dinesh P. Patel
  • Water soluble antifoggant for powder developer solutions
    Patent number: 5272045
    Abstract: Solid anti-fogging agents such as 5-nitroindazole which are otherwise poorly soluble in water are converted to readily water soluble compositions that are solids at room temperature when they are first dissolved in water soluble polymers or other organic compounds that have a melting point above room temperature and do not chemically react with the anti-fogging agent. The anti-foggants are preferably dissolved in the polymer or organic compound at or near the compounds' melting point below 175.degree.C.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: December 21, 1993
    Assignee: Sun Chemical Corporation
    Inventors: Dinesh P. Patel, John L. Adkins
  • Chemically stable ascorbate-based photographic developer and imaging process
    Patent number: RE36384
    Abstract: The invention comprises a process for forming a high contrast photographic image including the steps of imagaewise exposing a silver halide photographic element containing a hydrazine compound which functions as a nucleating agent, wherein the element is free of incorporated amine boosters. The exposed element is developed with a chemically stable aqueous alkaline developing solution that is free of dihydroxybenzene developing agents and has a pH between 9.5 and 11. The developing solution comprises an ascorbic acid developing agent; an auxiliary developing agent; and a combination of an alkali metal carbonate and an alkali metal borate comprising between 0.125 and 0.5 molar concentration of the carbonate and between 0.04 and 0.35 molar concentration of the borate.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: November 9, 1999
    Assignee: Kodak Polychrome Graphics, LLC
    Inventors: John L. Adkins, Dinesh P. Patel