Eastman-kodak Company

Praxair Technology, Inc.

Carl B Richenberg

Ronald F Spohn

Edgar P Lougheed

Stephen P Chen

Bruce J Rubin

Frank M Jahnke

David M Melos

A process of dissolving solid waste material in packed beds comprises the addition to the packed bed of a solvent for the solid waste and a material which releases a gas on contact with the solvent which forms channels in the packed bed allowing more rapid access of the solvent to the bed.

Method of accelerating the dissolution rate of accumulated filter cake

A method of preparing a coupler dispersion in gelatin by separating the auxiliary coupler solvent using a hydrophobic microporous membrane and contacting the opposite surface of the membrane with a coupler solvent.

Method of preparing coupler dispersions for photographic use

A method of preparing a coupler dispersion in gelatin by separating the auxiliary coupler solvent using a hydrophilic membrane having a pure size less than 175 Angstroms.

Solid photographic addenda, such as photographic color couplers or sensitizing dyes, which are wet with occluded organic liquid, after being subjected, for example, to processes such as crystallization or washing, are contacted with an extractant composed of carbon dioxide in liquid form or in the form of a supercritical fluid to remove the organic liquid. The process is capable of use with any solid photographic addendum which is insoluble in the extractant and any organic liquid which is soluble in the extractant. It can be completed much more quickly than conventional processes in which such solids are dried with the aid of heat and/or vacuum, while effectively avoiding problems of clumping and thermal degradation which commonly occur in dryers. It provides a product that is capable of meeting the demanding requirements of the photographic art with respect to both physical and chemical characteristics.

Growing community of inventors

Batavia, NY, United States of America

Carl B Richenberg