Patents by Inventor Peter A. Angevine

Peter A. Angevine 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).

  • Patent number: 5705031
    Abstract: In a kraft pulp mill, a process and apparatus for removing and washing dregs from green liquor so that the pH of the dregs is below "hazardous waste" levels. Specifically, green liquor clarifier underflow is filtered using a simple non-precoat cassette filter to form a first dregs cake. The dregs cake is diluted, preferably with water. The diluted dregs cake is then filtered in a precoat dregs filter to produce a dregs cake that is at least 50% solid and has a pH of about 12.0 or less.
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: January 6, 1998
    Assignee: Kvaerner Pulping Technologies AB
    Inventor: Peter A. Angevine
  • Patent number: 4544542
    Abstract: A method for treating the fine-grained spend absorbent (primarily calcium sulfite and calcium sulfate) from a dry flue gas desulfurization process. The absorbent, having a small amount of binder therein, is oxidized in a fluidized bed reactor at a temperature in the range from about 700.degree. C. to about 1000.degree. C. to produce a dry essentially fully oxidized pelletized calcium sulfate product.Calcium sulfate pellets having an average diameter of from about 0.5 mm to 5 mm and containing from about 1% to about 3%, by weight, of binder constituents, are composed of agglomerated calcium sulfate particles having an average diameter of from about 50.mu. to about 100.mu. bound to each other by the binder constituents.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: October 1, 1985
    Assignee: Dorr-Oliver Incorporated
    Inventors: Peter A. Angevine, Sune Bengtsson, George P. Koudijs
  • Patent number: 4017585
    Abstract: Phosphate rock is calcined under conditions calculated to completely oxidize the carbon and sulfur in the rock. Calcination is also conducted at elevated temperature to eliminate cadmium metal, a poisonous substance in fertilizers, from the calcined rock product. A fluid bed system for eliminating cadmium metal in the calcination of phosphate rock involves a two-vessel system in which an independent cadmium removal vessel served by a separate fluidizing air stream carries out volatilization of cadmium, while preheating, precalcining and cooling is conducted in another multi-bed reactor which is served by a separate fluidizing air stream.
    Type: Grant
    Filed: October 29, 1974
    Date of Patent: April 12, 1977
    Assignee: Dorr-Oliver Incorporated
    Inventors: Peter A. Angevine, David W. Leyshon
  • Patent number: 3996333
    Abstract: A method for dehydrating alunite ore prior to further processing to recover metals therefrom, comprising exposing the ore in particulate form to burning coal as the heat supply in a fluidized bed fluidized with an oxygen containing gas. The invention is illustrated by the removal of water from alunite ore prior to further processing the ore to recover aluminum.
    Type: Grant
    Filed: August 28, 1975
    Date of Patent: December 7, 1976
    Assignees: Southwire Company, National Steel Corporation, Earth Sciences, Inc.
    Inventors: Philip M. Rooke, Harry B. Scott, Peter A. Angevine, Stanley A. Bunk