Patents Represented by Attorney Gary Nath

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  • Process for preparing ferric sulfate
    Patent number: 5766566
    Abstract: The invention relates to a process of preparing ferric sulfate by forming a slurry which contains ferrous sulfate and sulfuric acid, the slurry containing bivalent iron in both the solution phase and the solid phase, and by oxidizing this slurry to form a ferric sulfate slurry. When so desired, the obtained ferric sulfate slurry is solidified to form solid ferric sulfate. The obtained ferric sulfate may, as such or dissolved in water, be used for the treatment of waste waters or for preparing pure tap water.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: June 16, 1998
    Assignees: Kemira Pigments Oy, Kemira Chemicals Oy
    Inventors: Harri Mattila, Timo Kenakkala, Olli Konstari
  • Salt stable lubricant for water base drilling fluids
    Patent number: 4280915
    Abstract: A water base drilling fluid having enhanced lubricating properties in the presence of polyvalent cations comprising a mixture of (1) water; (2) finely divided inorganic solids; (3) an alkanolamide of a saturated fatty acid having 8 to 20 carbon atoms, or triglycerides thereof, and (4) an alkanolamide of an unsaturated fatty acid having 18 carbon atoms, or triglycerides thereof.
    Type: Grant
    Filed: June 23, 1977
    Date of Patent: July 28, 1981
    Assignee: NL Industries, Inc.
    Inventor: James D. Kercheville