Eastman-kodak Company

The University of North Carolina at Chapel Hill

The United States of America As Represented by the Department of Health

Janet N Younathan

Stephen P Singer

Daniel L Kapp

Jerrold N Poslusny

James Henry Reynolds

Robert J Ross

George J Burgmaier

Steven P Szatynski

Robert C Stewart

Christopher W Grote

Philip T Lau

Krishnan Chari

John W Harder

Louis Elbert Friedrich

Michael W Crawley

David A Wink

James P Merrill

David S Ross

Thomas J Meyer

David R Foster

Lillian M Kellogg

Royce W Murray

Susan D Hill

Anabisdally I Bodden

Tadeusz Malinski

Danae D Christodoulou

Melani Sullivan

This invention relates to a multilayer silver halide photographic element, generally processed with phenylenediamine based developer solutions, comprising a support bearing a cyan dye image-forming unit comprised of at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, and a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one layer additionally contains a 2-substituted-5-amino-1-napthol DIR according to Formula (I): wherein: It has been found that such 2-substituted-5-amino-1-napthol based DIRs have improved properties and can provide a conventional silver halide photographic element with excellent image structure and color reproduction.

Photographic material with improved development inhibitor releases

Color photographic element containing coupler moiety with improved amino acid timing group

Silver halide element with improved high temperature storage

The invention provides a color photographic element that contains a coupler useful for forming a neutral silver-based image. Such couplers are particularly useful to provide an auxiliary silver-based image for optically recording a sound track in color motion picture films.

Color photographic element containing coupler useful for forming neutral silver-based image

Silver halide element with improved high temperature storage and reduced thickness

Disclosed is a photographic element comprising a light-sensitive silver halide emulsion layer containing an azopyrazolone masking coupler and a monosubstituted quinone of formula I:

Reduced fog in photographic coatings containing a monosubstituted quinone

A multilayer silver halide color photographic element is disclosed comprising a support bearing a light-sensitive silver halide emulsion layer and a non-diffusible yellow-colored magenta dye-forming masking coupler of the following formula ##STR1## wherein COUP is a magenta dye-forming coupler having the azo group attached to its coupling position; q is an integer of from 0 to 3, and each R' independently represents a substituent group or two R' groups together complete a ring of from 5-7 atoms, which ring may include 1 or more heteroatoms selected from O, N and S; m is 1 or 2, and DG represents a substituent of the formula ##STR2## where each L.sup.1 represents a divalent linking group, preferably --O(CH.sub.2).sub.y --, --NHCO(CH.sub.2).sub.y --, or --NRCO(CH.sub.2).sub.y --, where R represents an alkyl or aryl group and y represents an integer from 1 to 4; each k is either 0 or 1; each L.sup.2 represents --NHSO.sub.2 --, --NHCO--, --SO.sub.2 NH--, or --CONH--, preferably at least one L.sup.2 group being --NHSO.sub.2 -- or --SO.sub.2 NH--, more preferably --NHSO.sub.2 --; each Z represents --SO.sub.3 M or --PO.sub.3 M, where M represents H or a counter ion such as Na, K, Li, or NH.sub.4 ; and each n represents an integer of from 1 to 5; with the provisos that each DG substituent group, when present, is located in the 4- or 6-position meta to the 2-hydroxyl substituent on the arylazo group, and that when at least one L.sup.1 or L.sup.2 group comprises an --NHSO.sub.2 -- or --SO.sub.2 NH-- group then the total number of Z group substituents on the coupler is at least 2, and when no L.sup.1 or L.sup.2 group comprises an --NHSO.sub.2 -- or --SO.sub.2 NH-- group then the total number of Z group substituents on the coupler is at least 3, and if k is 0 for a DG substituent group then the L.sup.2 group for that DG substituent is either --NHSO.sub.2 -- or --NHCO--.

Color photographic elements containing yellow-colored magenta

A multilayer silver halide color photographic element comprising a support bearing a light-sensitive silver halide emulsion layer and a non-diffusible yellow-colored magenta dye-forming masking coupler wherein the masking coupler is a 2'-hydroxy-5'-substituted-4-phenylazo-5-pyrazolone. The masking coupler has good coupling activity and desirable hues, and can be obtained in good yields by simple syntheses.

Color photographic elements containing yellow colored magenta dye

An electrode sensor which may be used to specifically and quantitatively measure nitric oxide is provided, as well as a method of preparing and using such an electrode sensor to measure nitric oxide concentration in solution. A nitric oxide (NO) microsensor based on catalytic oxidation of NO comprises a thermally-sharpened carbon fiber with a tip diameter of about 0.5-0.7 .mu.m coated with several layers of p-type semiconducting polymeric porphyrin and cationic exchanger deposited thereon. The microsensor, which can be operated in either the amperometric, voltammetric or coulometric mode utilizing a two or three electrode system, is characterized by a linear response up to about 300 .mu.M, a response time better than 10 msec and a detection limit of about 10 nM. The sensor of the present invention also discriminates against nitrite, the most problematic interferant in NO measurements. The amount of NO released from a single cell can thus be selectively measured in situ by a porphyrinic microsensor of the invention. A larger scale sensor utilizing porphyrin and cationic exchanger deposited on larger fibers or wires, platinum mesh or tin indium oxide layered on glass, can also be employed when measurement of NO concentration in chemical media, tissue or cell culture is desired.

Nitric oxide sensor

This invention provides a photographic process and element where the element comprises a support bearing a light-sensitive photographic silver halide layer containing (1) a bicyclic azole coupler, (2) an azopyrazolone masking coupler, and (3) an aromatic electron-rich compound having ring substituents for which the sum of the individual Hammett sigma-para values is more negative than -0.80.

Photographic element containing an azopyrazolone masking coupler

The invention provides a photographic process and element where the element comprises a light sensitive silver halide layer containing (1) an image dye-forming bicyclic azole coupler having bonded to the coupling site a group other than hydrogen which is clearable during the development process; (2) an azopyrazolone masking coupler; and (3) a stabilizing coupler having bonded to the coupling site only hydrogen atoms and/or carbon atoms which are not cleavable to permit dye formation during development.

A photographic element and imaging process used therewith provides reduced fogging where the element comprises a light sensitive silver halide layer containing (1) an azopyrazolone masking coupler and (2) a ballasted aromatic nitro compound having a reduction peak potential which is more positive than -1.3 V vs. the Standard Calomel Electrode.

Growing community of inventors

Fairport, NY, United States of America

Janet N Younathan