Photographic element including superimposed silver halide layers of different speeds

Claim 2

A photographic element as defined in claim 1 wherein each of said couplers has one of the following structural formulas:

Claim 3

A photographic element as defined in claim 3 wherein said Y1, Y2 and Y3 each represents a heterocyclic monothio radical containing from one to four heteronitrogen atoms, to complete said development inhibitor-releasing coupler.

Claim 4

A photographic element as defined in claim 4 wherein said Y1, Y2 and Y3 each represents a member selected from the group consisting of: a 2-nitrophenylthio groUp; a 2-aminophenylthio group; a 5-tetrazolylthio group; a 2-benzothiazolylthio group; and, a 5-phenyl-1,3,4-oxadiazolylthio group, to complete said development inhibitor-releasing coupler.

Claim 5

A photographic element as defined in claim 3 wherein said second photographic silver halide emulsion layer produces an effective speed which is about 0.6 Log E faster than the effective speed of said first photographic silver halide emulsion.

Claim 6

A photographic element as defined in claim 3 wherein said photographic silver halide emulsion layers and said support are separated by a nonimage-recording emulsion layer comprising silver halide grains which have an average diameter of less than about 1 micron.

Claim 7

A photographic element as defined in claim 7 wherein said nonimage-recording silver halide emulsion layer is coated at a thickness of from about 10 to 40 microns.

Claim 8

A photographic element comprising a support having coated thereon, in the order given: a. an unsensitized, nonimage-recording layer comprising gelatin having dispersed therein silver bromoiodide grains having an average diameter of about 0.1 to 1 micron; b. a first panchromatically sensitized photographic gelatin silver bromoiodide emulsion layer containing the cyan image-forming coupler 1-hydroxy-2-(8(2'',4''-di-tert-amylphenoxy)-N-butyl)-naphthamide and the development inhibitor-releasing coupler 1-hydroxy-4-(1-phenyl-5-tetrazolylthio)-2-( Delta -(2, 4-di-tert-amylphenoxyl)-N-butyl)naphthamide; and, c. a second panchromatically sensitized photographic gelatin silver bromoiodide emulsion layer containing the cyan image forming coupler 1-hydroxy-2-(8(2'',4''-di-tert-amylphenoxy)-N-butyl)-naphthamide, which layer produces an effective speed of about 0.6 Log E faster than said first silver halide emulsion layer.

Claim 9

A photographic element as defined in claim 3 wherein said photographic silver halide layers and said support are separated by a photographic antihalation layer.