Pfizer Corporation

Battelle Development Corporation

Ted L Tewksbury

Bruce F Monzyk

Chad M Cucksey

Timothy M Werner

David Kilanowski

Scott J Blonigen

Fred H Weber

Hamish A I McArthur

Harold N Conkle

Joseph E Schultz

Yosry A Attia

A vaccine for in ovo vaccination against avian coccidiosis produced by a method including obtaining the coccidial oocysts from a fecal suspension, homogenizing the fecal suspension, separating the oocysts from the fecal debris by either salt flotation using sodium sulfate or gas flotation using air, sporulating the oocysts using hydrogen peroxide and air sparging, bleaching the sporulated oocysts, washing the bleached oocysts, concentrating the sterile washed oocysts and combining the concentrates of various species of coccidial oocysts, and producing a vaccine. The method in whole or in part can be applied to other kinds of encysted protozoa to produce vaccines for various types of animals.

Method for the purification, recovery, and sporulation of cysts and oocysts

A concentrate containing precious metals is produced from a particulate feed material containing particles of various sizes by a size fractionation step, a gravity separation step performed on each size fraction separately, a magnetic separation step and a second gravity separation step. The process is especially intended for separating gold and other metals from so-called 'black sand' placer deposits.

Process for producing a metalliferous concentrate from a particulate

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Columbus, OH, United States of America

Ted L Tewksbury