Halogen, A Ring, Carbonyl, Or Additional -oh Bonded Directly To One Of The Benzene Rings Patents (Class 508/573)
  • Sulfurized phenolic antioxidant composition, method of preparing same, and petroleum products containing same
    Patent number: 6096695
    Abstract: The present invention relates generally to substantially liquid, chlorine-free, sulfur-bridged phenols useful as antioxidants and more specifically to the preparation of a substantially liquid, chlorine-free, sulfur-bridged, hindered phenol compositions which are effective antioxidant(s) in lubricating oils without causing excessive copper corrosion. The invention also includes lubricating oils containing an antioxidant additive of the present invention, as well as a method of reducing oxidation in the lubricating oil used in a machine such as an internal combustion engine.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: August 1, 2000
    Assignee: Ethyl Corporation
    Inventors: William Y. Lam, Vincent J. Gatto
  • Sulfurized phenolic antioxidant composition method of preparing same and petroleum products containing same
    Patent number: 6001786
    Abstract: The present invention relates generally to substantially liquid, chlorine-free, sulfur-bridged phenols useful as antioxidants and more specifically to the preparation of a substantially liquid, chlorine-free, sulfur-bridged, hindered phenol compositions, using 1-propanol as the reaction solvent, which are effective antioxidant(s) in lubricating oils and liquid organic fuels without causing excessive copper corrosion and which exhibit improved elastomer seal compatibility. The invention also includes lubricating oils and liquid organic fuels containing an antioxidant additive of the present invention, as well as a method of reducing oxidation in the lubricating oil or liquid organic fuel used in a machine such as an internal combustion engine.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: December 14, 1999
    Assignee: Ethyl Corporation
    Inventors: Vincent James Gatto, Abbas Kadkhodayan
  • Alkylated thiophenol lubricants
    Patent number: 5780402
    Abstract: Novel alkylated thiophenols are high temperature stable lubricant fluids having low temperature properties and excellent load-carrying properties and additive solubility.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: July 14, 1998
    Inventor: Leslie R. Rudnick