Patents by Inventor Elisavet P. Vrahopoulou

Elisavet P. Vrahopoulou 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).

  • Polyol ester distillate fuels additive
    Patent number: 5993498
    Abstract: A polyol ester distillate fuel additive exhibits improved lubricity and friction and wear performance. The ester has between about 1% and about 35% unconverted hydroxyl groups and is characterized as having a hydroxyl number from about 5 to about 180.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: November 30, 1999
    Assignee: Exxon Research and Engineering Co.
    Inventors: Elisavet P. Vrahopoulou, Richard Henry Schlosberg, David Wayne Turner
  • Lubricating oil containing additive comprising reaction product of molybdenum dithiocarbamate and dihydrocarbyl dithiophosphoric acid
    Patent number: 5939364
    Abstract: Multifunctional molybdenum compounds, which are the reactive product of molybdenum dithiocarbamates and (non-metal containing) dihydrocarbyl dithiophosphoric acids, and the oils that contain them are new compositions which are useful as lubricant additives. They impart to the lubricant formulations to which they are added low friction and excellent friction retention properties.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: August 17, 1999
    Assignee: Exxon Research & Engineering Co.
    Inventors: Richard Samuel Polizzotti, Elisavet P. Vrahopoulou, Stephen D. Cameron, Charles Frederick Pictroski
  • Lubricating oil containing an additive comprising the reaction product of molybdenum dithiocarbamate and metal dihydrocarbyl dithiophosphate
    Patent number: 5814587
    Abstract: Multifunctional molybdenum compounds, which are the reactive product of molybdenum dithiocarbamates and metal dihydrocarbyl dithiophosphates, are new compositions which are useful as lubricant additives. They impart to the lubricant formulations to which they are added low friction and excellent wear properties at reduced phosphorous concentrations.
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: September 29, 1998
    Assignee: Exxon Research and Engineering Company
    Inventors: Elisavet P. Vrahopoulou, Richard S. Polizzotti, Daniel Paul Leta, Stephan D. Cameron
  • Engine oil with improved fuel economy properties (law372).
    Patent number: 5658862
    Abstract: A lubricating oil composition having improved fuel economy and fuel economy retention property which comprises a lubricating oil basestock, a boron containing alkenyl succinimide, molybdenum, di-thiocarbamate and/or molybdenum dithiophosphate, calcium and magnesium salicylate, and ethylene copolymer.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: August 19, 1997
    Assignee: Exxon Research and Engineering Company
    Inventor: Elisavet P. Vrahopoulou
  • Engine oil
    Patent number: 5631212
    Abstract: A lubricating oil composition having improved fuel economy, wear resistance and antioxidancy properties which comprise a lubricating oil basestock, an oil-soluble copper salt, an oil-soluble molybdenum salt, a Group II metal salicylate and a borated polyalkenyl succinimide.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: May 20, 1997
    Assignee: Exxon Research and Engineering Company
    Inventor: Elisavet P. Vrahopoulou
  • Lubricant composition containing alkoxylated amine salt of a dihydrocarbyldithiophosphoric acid (law024)
    Patent number: 5352374
    Abstract: A lubricating oil composition having improved antiwear, antioxidancy and fuel economy properties which comprises a hydroisomerized wax basestock and an alkoxylated amine salt of a dihydrocarbyldithiophosphoric acid of the formula ##STR1## where R.sup.1 and R.sup.2 are each independently hydrocarbyl groups having from 3 to 30 carbon atoms, R.sup.3 is a hydrocarbyl group of 2 to 22 carbon atoms, x and y are each independently integers from 1 to 15 with the proviso that the sum of x+y is from 2 to 20.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: October 4, 1994
    Assignee: Exxon Research & Engineering Co.
    Inventors: Jacob J. Habeeb, Ramon L. Espino, Elisavet P. Vrahopoulou