Patents by Inventor Ted L. Tewksbury

Ted L. Tewksbury has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for the purification, recovery, and sporulation of cysts and oocysts
    Patent number: 7229615
    Abstract: 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.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: June 12, 2007
    Assignee: Pfizer, Inc.
    Inventors: Harold N. Conkle, Joseph E. Schultz, Scott J. Blonigen, Fred H. Weber, David R. Kilanowski, Bruce Monzyk, Timothy M. Werner, Chad M. Cucksey, Hamish A. I. McArthur, Ted L. Tewksbury
  • Method for the purification, recovery, and sporulation of cysts and oocysts
    Patent number: 6984378
    Abstract: 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.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: January 10, 2006
    Assignee: Pfizer, Inc.
    Inventors: Harold N. Conkle, Joseph E. Schultz, Scott J. Blonigen, Fred H. Weber, David R. Kilanowski, Bruce Monzyk, Timothy M. Werner, Chad M. Cucksey, Hamish A. I. McArthur, Ted L. Tewksbury
  • Process for producing a metalliferous concentrate from a particulate feed material
    Patent number: 4512879
    Abstract: 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.
    Type: Grant
    Filed: July 20, 1983
    Date of Patent: April 23, 1985
    Assignee: Battelle Development Corp.
    Inventors: Yosry A. Attia, Ted L. Tewksbury