Patents by Inventor John S. Chiang

John S. Chiang 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).

  • Preparation of strontium carbonate
    Patent number: 4421729
    Abstract: Strontium carbonate is prepared by the process of reacting strontium nitrate in an aqueous reaction medium with carbon dioxide to precipitate strontium carbonate product, the nitric acid byproduct that forms being neutralized by the introduction of lime to the reaction medium.
    Type: Grant
    Filed: January 11, 1982
    Date of Patent: December 20, 1983
    Assignee: FMC Corporation
    Inventors: John S. Chiang, David Goldstein
  • Preparation of strontium nitrate from celestite and calcium nitrate
    Patent number: 4337233
    Abstract: Strontium nitrate is prepared by reacting celestite (strontium sulfate) with excess calcium nitrate in limited amounts of water, quickly extracting strontium nitrate from the reaction mixture by vigorous agitation with additional water, and recovering strontium nitrate by evaporation of the extract solution.
    Type: Grant
    Filed: June 12, 1981
    Date of Patent: June 29, 1982
    Assignee: FMC Corporation
    Inventors: John S. Chiang, David Goldstein
  • Method of producing crystalline sodium aluminum phosphate
    Patent number: 4289739
    Abstract: In the production of SALP tetrahydrate wherein sodium carbonate and aluminum hydroxide are added to aqueous phosphoric acid, the viscous reactive mixture is agitated with water to free the SALP tetrahydrate crystals from the gelatinous matrix. The crystals are recovered by filtration or centrifugation.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: September 15, 1981
    Assignee: FMC Corporation
    Inventors: John S. Chiang, Theodore F. Munday, Joseph M. Ilardi
  • Process of preparing peroxymonosulfate
    Patent number: 4049786
    Abstract: High strength peroxymonosulfate is prepared by adding concentrated sulfuric acid to a solution of a soluble peroxydisulfate whereby the heat of solvation of the sulfuric acid hydrolyzes the peroxydisulfate to the peroxymonosulfate; the temperature is controlled to provide a range of about 140.degree. to 160.degree. F. After about 15 to 45 minutes, the solution is cooled rapidly to about room temperature.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: September 20, 1977
    Assignee: FMC Corporation
    Inventor: John S. Chiang