Eastman-kodak Company

Edgar P Lougheed

Steven D Possanza

Carl B Richenberg

Stephen P Chen

Donald E Eaton

Brian J Connolly

Angela H R Jones

Lawrence D Meston

A multiport valve is taught for regulating flow of liquid therethrough originating from at least two sources. The valve includes a three cylindrical valve chambers each having a piston residing therein such that through actuation of the pistons flow through each valve chamber can be permitted or stopped independently. There is an inlet port that tangentially intercepts the first cylindrical valve chamber and there is an outlet port that tangentially intercepts an intermediate cylindrical valve chamber. The design of the three valve chambers and the inlet and outlet ports to the valve chambers effectively eliminates any bubble traps in the valve and allows bubbles to be swept from the valve chambers.

Purgable multiport valve

The present invention is a method to add dry gelatin to a photographic emulsion in either a liquid or a solid form. The dry gelatin is added by entraining the dry gelatin in air to form a gaseous mixture of dry gelatin in air and directing this mixture into the solid or liquid photographic emulsion. An air eductor is used to deliver the dry gelatin. When adding dry gelatin to a solution, the rate is determined by the solution viscosity and volume. When adding the dry gelatin to a solid emulsion, the dry gelatin rate is not as critical but uniform addition is still needed to interdisperse the dry gel with the emulsion pellets.

Dry gelatin addition to an emulsion/dispersion mixture

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.

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Byron, NY, United States of America

Edgar P Lougheed