Patents by Inventor George H. Senkler

George H. Senkler 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 purifying TiO.sub.2 ore by alternate leaching with an aqueous solution of an alkali metal compound and an aqueous solution of mineral acid
    Patent number: 5085837
    Abstract: Process for purifying TiO.sub.2 ore consisting essentially of subjecting the ore to two or more leaching treatments, said leaching treatments alternating between use of an aqueous solution of a mineral acid and an aqueous solution of an alkali metal compound selected from the group consisting essentially of alkali metal carbonates, hydroxides or mixtures thereof.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: February 4, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Tze Chao, George H. Senkler, Jr.
  • Method for purifying TiO.sub.2 ore
    Patent number: 5011666
    Abstract: Process for purifying TiO.sub.2 ore consisting essentially of subjecting the ore to two or more leaching treatments, said leaching treatments alternating between use of an aqueous solution of a mineral acid and an aqueous solution of an alkali metal compound selected from the group consisting essentially of alkali metal carbonates, hydroxides or mixtures thereof.
    Type: Grant
    Filed: July 28, 1988
    Date of Patent: April 30, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Tze Chao, George H. Senkler, Jr.
  • Light stable quinacridonequinone yellow pigment
    Patent number: 4286998
    Abstract: A solid solution of a quinacridonequinone with a stabilizer selected from the group consisting of 2-anilinoacridone, 5,6,7,8-tetrahydro-2-anilinoacridone, 6-anilinoquinolone and 2-aminoacridone of improved lightfastness is provided which displays improved dispersibility while still maintaining a high degree of transparency in automotive finishes when post-treated with a surfactant.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: September 1, 1981
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: Wilfried G. Holtje, George H. Senkler, Arthur J. Taggi