Patents by Inventor Allan E. Petersen

Allan E. Petersen 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).

  • Recovery of titanium from perovskite by acid sulfation
    Patent number: 4562049
    Abstract: Titanium is extracted from perovskite ores or concentrates by reaction of e perovskite ores or concentrates with sulfuric acid to form a sulfated residue, dissolving the sulfated residue in water or dilute acid, removing the precipitated calcium sulfate, and recovering the titanium in an aqueous solution.
    Type: Grant
    Filed: September 20, 1984
    Date of Patent: December 31, 1985
    Assignee: The United States of America as represented by Secretary of Interior
    Inventors: Monte B. Shirts, Dale A. Martin, Allan E. Petersen
  • Recovery of titanium from perovskite using sulfuric acid leaching
    Patent number: 4552730
    Abstract: A method of recovering titanium from perovskite by leaching with a strong sulfuric acid solution is disclosed. The leaching produces a sulfate solution containing titanium and a calcium sulfate residue when the time and temperature of leaching are controlled as a function of the grind size of the perovskite and concentration of the sulfuric acid. The titanium-containing solution and the calcium sulfate residue are then separated. The titanium in the leach solution is precipitated by heating, as a mixture of titanium sulfates, which are then redissolved in water or dilute acid solution. Titanium dioxide may then be prepared by hydrolysis of the titanium in the resulting aqueous solution.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: November 12, 1985
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Monte B. Shirts, Dale A. Martin, Allan E. Petersen