Patents by Inventor Leah T. Mendelson

Leah T. Mendelson 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).

  • Lubricating compositions
    Patent number: 4909951
    Abstract: Additives comprising an adduct of a calcium salt of a thiocarbonic acid and calcium hydroxide are useful in lubricants to enhance both the extreme pressure/anti-wear and anti-oxidation capabilities thereof. The lubricants are preferably oils of lubricating viscosity, which may be thickened to a grease-like consistency with one or more oil thickeners and contain from about 0.1 to about 20 weight percent of said adduct.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: March 20, 1990
    Assignee: Union Oil Company of California
    Inventors: Leah T. Mendelson, Richard L. Pilling
  • Lubricating compositions and method of using same
    Patent number: 4908143
    Abstract: Additives comprising a salt or complex of tetrathiocarbonic acid are useful in lubricants to enhance both the extreme pressure/anti-wear and anti-oxidant capabilities thereof. The lubricants preferably are oils of lubricating viscosity, which may be thickened to grease-like consistency with one or more oil thickeners, and contain from about 0.1 to about 20 weight percent of said additives.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: March 13, 1990
    Assignee: Union Oil Company of California
    Inventors: Josefina M. Dumdum, Leah T. Mendelson, Richard L. Pilling
  • Extreme pressure lubricating compositions and method of using same
    Patent number: 4908142
    Abstract: Additives containing a salt or complex of trithiocarbonic acid are useful in lubricants to enhance the extreme pressure/anti-wear and anti-oxidation capabilities thereof. The lubricants are preferably oils of lubricating viscosity, which may be thickened to a grease-like consistency with one or more oil thickeners, and contains from about 0.1 to about 20 weight percent of said additives.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: March 13, 1990
    Assignee: Union Oil Company of California
    Inventors: Josefina M. Dumdum, Leah T. Mendelson, Richard L. Pilling
  • Lubricating compositions
    Patent number: 4892670
    Abstract: A boron-containing heterocyclic compound prepared by reacting a primary amine or ammonia with an alkylene oxide or epoxide and then reacting concurrently or subsequently this reaction intermediate with a boric acid. This boron-containing heterocyclic compound may further be reacted with a metal, metaloid or other metal compound and even further contain sulfur, such as a sulfide group.The boron-containing heterocyclic compound provides extreme pressure anti-wear properties when provided in a lubricating composition. The lubricating composition may also comprise anti-oxidants, copper corrosion inhibitors, and lead corrosion inhibitors. The anti-wear properties of a lubricating composition can be enhanced using the borates of the present invention in conjunction with a copper compound.
    Type: Grant
    Filed: January 29, 1985
    Date of Patent: January 9, 1990
    Assignee: Union Oil Company of California
    Inventor: Leah T. Mendelson
  • Copper molybdenum salts as antioxidants
    Patent number: 4705641
    Abstract: The combination of copper and molybdenum salts is shown to be an effective antioxidant and anti-wear additive for hydrocarbons, such as lube oils. Accordingly the present invention is directed to a lube oil having improved oxidation stability, providing improved wear protection with reduced friction and comprising:A. a basestock, andB. an effective amount of a copper salt and a molybdenum salt.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: November 10, 1987
    Assignee: Exxon Research and Engineering Company
    Inventors: Irwin L. Goldblatt, Leah T. Mendelson
  • Trisubstituted-borate compounds
    Patent number: 4701274
    Abstract: A lubricating composition having extreme pressure anti-wear properties comprises a lubricating oil and a trisubstituted-borate prepared by sulfurizing the reaction product of a boron compound, a phenol compound, and either a mono-functional compound or dihydroxy functional compound free of nitrogen.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: October 20, 1987
    Assignee: Union Oil Company of California
    Inventors: Michael C. Croudace, Leah T. Mendelson, Richard A. Holstedt