Patents by Inventor Frank F. Lu

Frank F. Lu 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).

  • Carbon steel corrosion inhibitors
    Patent number: 5589106
    Abstract: The prevention of corrosion on the surfaces of metallic pipes, heat exchangers, and the like which are in contact with industrial cooling waters, and particularly industrial cooling waters containing low levels of hardness is controlled utilizing a corrosion inhibiting amount of a composition including an alkali metal silicate, a hydroxycarboxylic acid or its water soluble salts, an organophosphonate, and a water soluble polymer which acts as a dispersant. Superior corrosion inhibition is achieved using the compositions of this invention as corrosion inhibitors, particularly in cooling water systems employing mild steel metallurgy.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: December 31, 1996
    Assignee: Nalco Chemical Company
    Inventors: Sang-Hea Shim, Dennis P. Bakalik, Donald A. Johnson, Bo Yang, Frank F. Lu
  • Method of preventing yellow metal corrosion in aqueous systems with superior corrosion performance in reduced environmental impact
    Patent number: 5503775
    Abstract: The invention provides a method of preventing the corrosion of yellow metal surfaces in contact with water. The method comprising the step of adding to the water an environmentally safe mixed tolyltriazole composition including at least 65% of the 5-methylbenzotriazole isomer by weight.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: April 2, 1996
    Assignee: Nalco Chemical Company
    Inventors: Narasimha M. Rao, Frank F. Lu, Donald A. Johnson, Nhuan P. Nghiem