John E Keevert

US Patent:

6518007, Feb 11, 2003

Filed:

Dec 11, 2001

Appl. No.:

10/014704

Inventors:

Kenneth J. Reed - Rochester NY
George J. Burgmaier - Pittsford NY
John E. Keevert - Rochester NY
Roger L. Klaus - Victor NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 134

US Classification:

430545, 430551, 430567, 430569, 430607, 430610, 430617, 430639

Abstract:

This invention relates to a multicolor silver halide photographic element comprising a support and at least one high bromide silver halide emulsion layer comprising low fogging tabular silver halide grains, said element further comprising an antifoggant represented by the following Structure I: wherein R is an aliphatic or cyclic group, R and R are independently hydrogen or bromine as long as at least one of them is bromine, L is a divalent linking group, m and n are independently 0 or 1, and SG is a solubilizing group that has a pKa of 8 or less.

US Patent:

6756188, Jun 29, 2004

Filed:

Sep 16, 2002

Appl. No.:

10/244270

Inventors:

John E. Keevert - Rochester NY
Stephen P. Singer - Spencerport NY
Kenneth J. Reed - Rochester NY
Kenneth J. Lushington - Rochester NY
Mary C. Brick - Webster NY
James A. Friday - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 746

US Classification:

430377, 430505, 430506, 430544, 430549, 430555, 430955

Abstract:

This invention relates to a photographic element comprising a support and at least two silver halide emulsion layers further comprising, an electron transfer agent releasing compound represented by the formula (I): wherein: CAR is a carrier moiety which is capable of releasing â(L) -ETA on reaction with oxidized developing agent; L is a divalent linking group, n is 0, 1 or 2; and ETA is a releasable 1-aryl-3-pyrazolidinone electron transfer agent having a calculated log partition coefficient (c log P) greater than or equal to 2. 40 and the total sum of the Hammett sigma(para) values of the substituents on the 1-aryl ring is 0. 51 or less, the ETA being bonded to L or CAR through either the nitrogen atom in the 2-position or the oxygen attached to the 3-position of the pyrazolidinone ring; and a development accelerator releasing compound represented by the formula (II): wherein: CAR is a carrier moiety which is capable of releasing â(SAM)âNX âNX X on reaction with oxidized developing agent; SAM is a silver absorbable moiety attached to the carrier moiety and is released on reaction with oxidized development agent; and âNX âNX X is a hydrazine group wherein X , X and X are individually hydrogen or a substituent chosen from alkyl, aryl, carbonyl or sulfonyl groups with the proviso that at least one of X , X and X is hydrogen.

US Patent:

6893809, May 17, 2005

Filed:

Sep 16, 2002

Appl. No.:

10/244569

Inventors:

Kenneth J. Reed - Rochester NY, US
James A. Friday - Rochester NY, US
John E. Keevert - Rochester NY, US
Stephen P. Singer - Spencerport NY, US
Mary C. Brick - Webster NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C001/46

US Classification:

430505, 430546, 430549, 430551, 430552, 430955, 430567, 430506, 430569

Abstract:

This invention relates to a negative silver halide photographic element comprising a support and a silver halide imaging layer containing a light sensitive silver halide imaging emulsion, said silver halide imaging layer further comprising a separately precipitated non-imaging intentionally fogged fine grain emulsion and an electron transfer agent releasing compound represented by formula (I):CAR-(L)-ETA  (I)wherein:.

US Patent:

55807127, Dec 3, 1996

Filed:

Feb 3, 1995

Appl. No.:

8/383348

Inventors:

John E. Keevert - Rochester NY
Shane C. Weber - Woodbridge CT
Ramesh Jagannathan - Rochester NY
Gerald W. Klein - Issaquah WA

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 1015
G03C 1047
C12P 2100

US Classification:

430569

Abstract:

Certain synthetically prepared biopolymers are useful as peptizers in the preparation of photographic silver halide emulsions and elements. Such materials can be used as either nucleation or growth peptizers in place of common peptizing colloids, such as gelatins. The biopolymers can be prepared using recombinant or chemical synthetic methods and designed to have a particular affinity (either high or low) for silver ions. Thus, they can be used to control silver halide grain morphology in the emulsions.

US Patent:

49817817, Jan 1, 1991

Filed:

Aug 28, 1989

Appl. No.:

7/406208

Inventors:

Woodrow G. McDugle - Rochester NY
John E. Keevert - Rochester NY
Alfred P. Marchetti - Penfield NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 106

US Classification:

430605

Abstract:

Photographic silver halide emulsions are disclosed comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure internally containing oxo coordination ligands and a transition metal chosen from groups 6, 7, and 8 of the periodic table of elements.

US Patent:

50377329, Aug 6, 1991

Filed:

Aug 28, 1989

Appl. No.:

7/399723

Inventors:

Woodrow G. McDugle - Rochester NY
Alfred P. Marchetti - Penfield NY
John E. Keevert - Rochester NY
Marian S. Henry - Rochester NY
Myra T. Olm - Webster NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 108

US Classification:

430567

Abstract:

Photographic silver halide emulsions are disclosed comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure internally containing a carbonyl coordination ligand and a transition metal chosen from groups 8 and 9 of the periodic table of elements.

US Patent:

49450352, Jul 31, 1990

Filed:

Apr 8, 1988

Appl. No.:

7/179377

Inventors:

John E. Keevert - Rochester NY
Woodrow G. McDugle - Rochester NY
Raymond S. Eachus - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 106

US Classification:

430567

Abstract:

Photographic silver halide emulsions are disclosed comprised of radiation sensitive silver halide grains containing greater than 50 mole percent chloride and less than 5 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence of a hexacoordination complex of rhenium, ruthenium, or osmium with at least four cyanide ligands. The emulsions exhibit increased sensitivity.

US Patent:

53858190, Jan 31, 1995

Filed:

Dec 22, 1993

Appl. No.:

8/171588

Inventors:

Wayne A. Bowman - Walworth NY
Roger A. Weiss - Webster NY
Gerald W. Klein - Issaquah NY
John E. Keevert - Rochester NY
Shane C. Weber - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 1015
G03C 1005
G03C 104

US Classification:

430569

Abstract:

A process for preparing a thin tabular grain silver halide emulsion comprised of silver halide grains which have a halide content of at least 50 mole percent bromide, wherein tabular grains of less than 0. 15 micrometers in thickness and having an aspect ratio of greater than 8 account for greater than 50 percent of the total grain projected area, comprises the steps of nucleating the silver halide grains with a gelatino-peptizer or with the use of certain synthetic polymers that serve as effective nucleation peptizers and then growing the silver halide grains with the use of either a gelatino-peptizer or certain synthetic polymers that serve as effective growth peptizers.