Patents by Inventor Hamish McNab

Hamish McNab 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).

  • Method of transforming pyrazole compounds
    Patent number: 5723623
    Abstract: The invention provides a method of transforming a pyrazole compound, comprising cyclizing a 1,5-diaminopyrazole compound having the structure: ##STR1## wherein R.sup.1 is a substituent group; and X is hydrogen, an acyl group, or a heterogroup;in an alkaline solution with carbon disulphide to produce a pyrazolotriazole thione compound having formula (3).
    Type: Grant
    Filed: October 18, 1996
    Date of Patent: March 3, 1998
    Assignee: Eastman Kodak Company
    Inventors: David Clarke, Hamish McNab, Richard W. Mares
  • Photographic elements containing certain yellow dye-forming couplers
    Patent number: 5693458
    Abstract: The invention provides a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a dye-forming coupler of formula (I): ##STR1## wherein X is H or a coupling-off group, R.sub.1 is H or a substituent group; Y and Z are the same or different and are H or are independently selected from alkyl, aryl and heteroaryl groups; provided that Y and Z taken together with the nitrogen atom may form a 5-10 membered heterocyclic ring.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: December 2, 1997
    Assignee: Eastman Kodak Company
    Inventors: Bernard Arthur Clark, Robert Nicholas Gourley, Hamish McNab, Craig Cameron Sommerville
  • Photographic element containing pyrroloylacetamide yellow coupler
    Patent number: 5674667
    Abstract: The present invention provides a photographic element comprising a silver halide emulsion layer having associated therewith a dye-forming coupler of formula (I): ##STR1## wherein X is H or a coupling-off group, R and R.sup.1 are independently selected from H and substituent groups; Y and Z are independently selected from H and alkyl, aryl or heteroaryl groups; provided that Y and Z taken together with the nitrogen atom may form a 5-10 membered heterocyclic ring group which may contain one or more further heteroatoms selected from N, O and S.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: October 7, 1997
    Assignee: Eastman Kodak Company
    Inventors: Bernard Arthur Clark, Hamish McNab, Craig Cameron Sommerville