Patents by Inventor Joseph J. Zaher

Joseph J. Zaher 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).

  • PROCESSES FOR PRODUCING TITANIUM DIOXIDE
    Publication number: 20080159933
    Abstract: Provided are processes for the production of titanium dioxide from ilmenite. In these processes, ilmenite is digested with aqueous ammonium hydrogen oxalate. Iron from the ilmenite precipitates as a hydrated iron oxalate and is removed by filtering, leaving a titanium-rich solution. The titanium-rich solution can be further processed to form titanium dioxide.
    Type: Application
    Filed: December 28, 2006
    Publication date: July 3, 2008
    Applicant: E. I. DUPONT DE NEMOURS AND COMPANY
    Inventors: DAVID RICHARD CORBIN, THOMAS PAUL GRIFFIN, KEITH W. HUTCHENSON, SHENG LI, MARK BRANDON SHIFLETT, CARMINE TORARDI, JOSEPH J. ZAHER
  • Manufacture of oxalic acid dihydrate
    Patent number: 7244862
    Abstract: A process for the manufacture of oxalic acid dihydrate in which an aqueous solution of sodium oxalate is contacted with hydrochloric acid and the resulting mixture then cooled to precipitate oxalic acid, followed by optional recovery and recycling of the sodium oxalate and hydrochloric acid into the reaction chamber.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: July 17, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Joseph J. Zaher, Bryan C. Fritzler, Scott N. Hutchison