Eastman-kodak Company

Jon N Eikenberry

Roger L Lok

Karl J Sanford

Roger L Klaus

Jerzy Z Mydlarz

Yun C Chang

John W Sutherland

Wayne A Bowman

David T Southby

Ignazio S Ponticello

Richard C Sutton

Kenneth Joseph Reed

James A Friday

Jeffrey L Hall

John D Buhr

Richard L Daubendiek

Annabel A Muenter

Robert D Wilson

George J Burgmaier

Jerome Robert Lenhard

Timothy R Gersey

Hans W Osterhoudt

Joseph G Lighthouse

Kenneth G Harbison

Richard L Detwiler

Douglas L Oehlbeck

Barbara J Fisher

Joseph P Pepe

Kenneth G Christy, Jr

Brooke P Schlegel

Chung-yuan Chen

Karen L Warren

Robert E Bernard

Brian S White

Chris J Johnson

Nicholas E Grzeskowiak

Dolores L Humbert

Marsha D Bale Oenick

A process of preparing a high bromide tabular grain emulsion comprising a dispersion medium and silver halide grains including tabular grains having &lcub;111&rcub; major faces and an aspect ratio of at least 2, which contain greater than 50 mole percent bromide, based on silver, and which account for greater than 50 percent of total grain projected area, where such tabular grains have an average aspect ratio of at least 5, the process comprising (i) in a grain nucleation step creating in a dispersing medium tabular silver halide grain nuclei containing parallel twin planes and (ii) in a grain growth step subsequently growing the tabular grain nuclei into tabular grains in a silver halide reaction vessel by adding a silver ion source and a halide ion source to the reaction vessel and precipitating silver halide onto the tabular grain nuclei, wherein thiocyanate ion is introduced into the silver halide reaction vessel prior to the addition of at least the final 10 mole percent of the total silver added to the reaction vessel, and further wherein the introduced thiocyanate ion concentration is at most 0.4 mole %, based on the total silver added to the reaction vessel. Use of thiocyanate during grain precipitation result in increased aspect ratio without degrading morphological purity.

Method for making tabular grain silver halide emulsion

Core/shell emulsions with enhanced photographic response

The invention relates to an emulsion comprising chemically and spectrally sensitized silver halide grains having formate on the surface of said grams.

Speed addendum for photographic emulsions

Fragmentable electron donor compounds combined with broad blue spectral sensitization

Silver halide photographic materials containing solubilized antifoggants

Photographic element containing bis Au(I) complexes and sulfiding agent

Performance of high speed emulsions for color film

This invention relates to a method of reducing fog in a silver halide emulsion comprising taking a high fogging emulsion which has been chemically sensitized and cooled, holding the high fogging emulsion in the form of a melt in preparation for coating on a support, and prior to or during said holding, contacting the emulsion with an isothiazolin-one compound represented by the following formula

Method of suppressing fog in silver halide emulsions

The invention relates to a photographic element wherein at least one layer comprises silver halide grains wherein said grains have a surface iodide of less than 0.6 mol percent, total grain iodide of about 1.0 to 10 mol percent, said iodide being introduced in the core of the grains, an alkynylamine compound of Formula I: ##STR1## wherein X represents oxygen, sulfur, selenium, or an unsubstituted or alkyl substituted nitrogen; R.sup.1 represents hydrogen or an alkyl of from 1 to 5 carbon atoms, and R.sup.2 represents hydrogen, or an alkyl, aryl, heteroaryl, carbocyclic or heterocyclic group, and R.sup.3 and R.sup.4 independently represent hydrogen, halogen, or a substituted or unsubstituted alkyl or alkoxy group, preferably one having fewer than 6 carbon atoms, and the reductone of Formula II ##STR2## wherein R.sub.1 and R.sub.2 are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group such as --OH, sulfonamide, sulfamoyl, or carbamoyl, R.sub.1 and R.sub.2 may be joined to complete a heterocyclic ring, R.sub.4 and R.sub.5 are H, OH, alkyl, aryl, cycloalkyl, or may together represent an alkylidene group, n is 1 or 2 and R.sub.3 is H, alkyl, aryl, or CO.sub.2 R.sub.6 where R.sub.6 is alkyl, and

Latent image stability using alkynylamines and iodide emulsions

This invention relates to silver halide photographic element comprising a silver halide emulsion chemically sensitized in the presence of an isothiazolin-one compound represented by the formula ##STR1## wherein R.sup.1 is a substituent; and Z is a substituted or unsubstituted saturated ring, wherein the isothiazolin-one compound was added after precipitation of the emulsion.

Silver halide photographic elements with reduced fog

A photographic element comprising a support having situated thereon a silver halide emulsion, the emulsion comprising an alkynylamine compound of the formula: wherein Z represents atoms necessary to complete a 5 to 10-membered heterocyclic ring system, R.sup.1 represents hydrogen or an alkyl of from 1 to 5 carbon atoms, and R.sup.2 represents hydrogen, or an alkyl, aryl, heteroaryl, carbocyclic or heterocyclic group; and at least one dihydroxy aryl compound represented by formula II or III: ##STR1## wherein R.sup.3 to R.sup.12 are independently selected from the group consisting of hydrogen, hydroxy, sulfonate, or an alkyl of from 1 to 5 carbon atoms, and wherein at least two of such groups represent a hydroxy group.

Photographic element and method of making a silver halide emulsion

A color photographic negative element which has a transparent base and a blue sensitive silver halide emulsion layer. The foregoing blue sensitive layer meets each of the following spectral sensitivity requirements:

Photographic element containing emulsion with particular blue sensitivity

The invention is generally accomplished by providing a method of finishing an emulsion comprising providing silver halide grains, adding to said emulsion in an amount between about 0.005 mmol/per mole of silver and 0.10 mmol/per mole of silver of the compound ##STR1## X=O, S, Se; R.sub.1 =alkyl or substituted alkyl or aryl or substituted aryl;

Class of compounds which increases and stabilizes photographic speed

A dry multilayer analytical element for assaying transaminases wherein the analytical element comprises:

Dry multilayer analytical elements for assaying transaminases

An analytical element has a peroxidase-labeled ligand analog distributed within a water-soluble binder composition comprising at least about 50 percent, by weight, of poly(vinyl alcohol). As a result, the peroxidase retains more of its stability prior to use. Such elements can be used to determine any of a number of immunologically reactive analytes, such as digoxin.

Binder composition and analytical element having stabilized peroxidase

Growing community of inventors

Rochester, NY, United States of America

Jon N Eikenberry