Patents by Inventor Liehpao O. Farng

Liehpao O. Farng 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).

  • Dithiocarbamate-derived ethers as multifunctional additives
    Patent number: 5514189
    Abstract: Dialkyl dithiocarbamate-derived organic ethers have been found to be effective antiwear/antioxidant additives for lubricants or fuels.
    Type: Grant
    Filed: August 11, 1994
    Date of Patent: May 7, 1996
    Assignee: Mobil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, Richard N. Nipe
  • Hydroxyaryl/phosphonate-derived aminoalkanol borates as multifunctional antiwear/EP load-carrying additives
    Patent number: 5514290
    Abstract: Hydroxyaryl/phosphonate-derived aminoalkanol mixed borates have been found to be effective multifunctional load-carrying additives for lubricants.
    Type: Grant
    Filed: October 17, 1994
    Date of Patent: May 7, 1996
    Assignee: Mobil Oil Corporation
    Inventors: John R. Donofrio, Liehpao O. Farng, Andrew G. Horodysky
  • Lubricant compositions comprising tolyltriazole-derived tri/tetra esters as additives for distillate fuels
    Patent number: 5492544
    Abstract: Tolyltriazole derived esters of tri, tetra, and poly carboxylic acids or an acid generating compound have been found to be effective lubricity additives for lube oils, greases, or distillate fuels.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: February 20, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, Lloyd A. Nelson
  • Phosphorodithioate-derived pyrrolidinone adducts as multifunctional antiwear/antioxidant additives
    Patent number: 5437694
    Abstract: Vinyl pyrrolidinone capped phosphorodithioates have been found to be effective multifunctional antiwear/antioxidant additives for fuel compositions.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: August 1, 1995
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, Ronald J. Poole
  • Multifunctional additives
    Patent number: 5407592
    Abstract: A lubricant of fuel composition contains a multifunctional antioxidant/metal deactivating and thermal stabilizing amount of a tolyltriazole-derived Mannich base made from a tolyltriazole, an aliphatic amine, such as diisobutylamine or bis(2-ethylhexyl)amine, a cyclic amine, such as 1,4-diaminocyclohexane or ether amines exemplified by C.sub.6 to C.sub.13 alkoxypropylamines and polyether primary amines such as those derived from nonylphenol ethyoxylates and formaldehyde. The reaction products are, optionally, treated with epoxide.
    Type: Grant
    Filed: September 21, 1992
    Date of Patent: April 18, 1995
    Assignee: Mobil Oil Corporation
    Inventors: Vic M. Cheng, Liehpao O. Farng, Andrew G. Horodysky, Ronald J. Poole
  • Borated dihydrocarbyl dithiocarbamate lubricant additives and composition thereof
    Patent number: 5370806
    Abstract: Borated dihydrocarbyl dithiocarbamate reaction products have been found to be effective antioxidant/antiwear multifunctional additives for lubricants.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: December 6, 1994
    Assignee: Mobil Oil Corporation
    Inventors: Angeline B. Cardis, Liehpao O. Farng, Andrew G. Horodysky, Abraham O. M. Okorodudu
  • Lubricant compositions comprising triazole-derived acid-esters or ester-amide-amine salts as antiwear additives
    Patent number: 5328625
    Abstract: Organic triazole-derived carboxylic acid-esters, and ester-amide-amine salts have been found to be effective antiwear additives for lubricants.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: July 12, 1994
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, Ronald J. Poole, John R. Donofrio
  • Phosphorodithioate-derived pyrrolidinone adducts as multifunctional antiwear/antioxidant additives
    Patent number: 5324441
    Abstract: Vinyl pyrrolidinone capped phosphorodithioates have been found to be effective multifunctional antiwear/antioxidant additives for lubricants.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: June 28, 1994
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, Ronald J. Poole
  • Amine-coupled hindered phenols and phosphites as multifunctional antioxidant/antiwear additives
    Patent number: 5288418
    Abstract: Amine coupled condensation products of hindered phenols and phosphites have been found to be effective antioxidant/antiwear additives for lubricants.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: February 22, 1994
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, William F. Olszewski
  • Lubricant additives
    Patent number: 5282988
    Abstract: A urethane reaction product, derived from an alkoxylated diorgano phosphorodithioate and an isocyanate, specifically, toluenediisocyanate and hexamethylene diisocyanate, is a multifunctional antiwear and antioxidant additive for lubricants. The isocyanate groups of the reaction product are substantially converted to urethane and/or urea groups through post reaction with active hydrogen compounds such as dibutylamine, bis(2-hydroxethyl) cocoamine and alcohols such as 2-propanol.
    Type: Grant
    Filed: November 4, 1991
    Date of Patent: February 1, 1994
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Arjun K. Goyal, Andrew G. Horodysky
  • Sulfur coupled hydrocarbyl derived mercaptobenzothiazole adducts as multifunctional antiwear additives and compositions containing same
    Patent number: 5199960
    Abstract: Sulfur-coupled hydrocarbyl derived mercaptobenzothiazole adducts have been found to be effective multifunctional antiwear additives for fuels and lubricants.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: April 6, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, James G. Murray
  • Phenylenediamine-derived phosphonates as multifunctional additives for lubricants
    Patent number: 5171465
    Abstract: A lubricant contains an antioxidant and antiwear amount of a Mannich base reaction product of a phenylenediamine, such as N,N'-dihydrocarbyl substituted phenylenediamine, an aldehyde or ketone and a dialkyl-substituted phosphonate such as dimethyl hydrogen phosphonate or bis(2-ethylhexyl) hydrogen phosphonate.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: December 15, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky
  • Amine-containing hindered phenolic antioxidant lubricant additives and compositions thereof
    Patent number: 5169547
    Abstract: Borated or partially borated, amine-contained hindered phenols provide effective antioxidant properties to compositions comprising lubricants and liquid fuels.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: December 8, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky
  • Mixed alcohol/dimercaptothiadiazole-derived hydroxy borates as antioxidant/antiwear multifunctional additives
    Patent number: 5137649
    Abstract: Mixed alcohol/dimercaptothiadiazole-derived hydroxy borates have been found to be effective antiwear/antioxidant multifunctional additives for lubricants.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: August 11, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, William F. Olszewski
  • Borated hydroxyalkyl esters of dithiocarbamic acids as multifunctional additives for lubricant compositions
    Patent number: 5126063
    Abstract: Lubricating oil and grease compositions contain borated hydroxyalkyl esters of amine or metal salts of diorganodithiocarbamic acid, such as N,N'-di-(2-ethylhexyl) dithiocarbamic acid, and hydrocarbylene oxie, such as propylene oxide, as antioxidant, load-carrying and friction modifying additives.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: June 30, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Angeline B. Cardis, Liehpao O. Farng, Abraham O. M. Okorodudu, Andrew G. Horodysky
  • Multifunctional additives for lubricants and fuels
    Patent number: 5084069
    Abstract: A lubricant or fuel composition contains a multifunctional antioxidant and antiwear amount of an O,O-diorgano-S-(2-hydroxyalkyl) phosphorodithioate derived hydrogen phosphonate which can be made by reacting a diorganophosphorodithioic acid with an epoxide and a dialkyl phosphite, such as dimethyl phosphite.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: January 28, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky
  • Sulfur coupled hydrocarbyl derived mercaptobenzothiazole adducts as multifunctional antiwear additives and compositions containing same
    Patent number: 5073279
    Abstract: Sulfur-coupled hydrocarbyl derived mercaptobenzothiazole adducts have been found to be effective multifunctional antiwear additives for fuels and lubricants.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: December 17, 1991
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, James G. Murray
  • Sulfur-phosphorus adducts of chromium catalyzed polyalphaolefins
    Patent number: 5057235
    Abstract: Phosphorodithioate derivatives of oligomers of polyalphaolefins of high viscosity index for use as lubricants and lubricant additives is described.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: October 15, 1991
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, Derek A. Law
  • Phosphorus-sulfur olefinic derivatives as multifunctional lubricants and multifunctional additives for lubricants
    Patent number: 5037567
    Abstract: Addition reaction products of phosphorus and sulfur-containing moieties to alpha olefins, internal olefins and functionalized olefins provides superior multifunctional additives for lubricating oils, greases and fuels and/or superior functionalized lubricants with multifunctional properties.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: August 6, 1991
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, Andrew G. Horodysky, Derek A. Law
  • Organic ester, amide or amine salts of phosphorodithioate substitute carboxylic anhydrides as multifunctional additives
    Patent number: 5019282
    Abstract: Certain organic ester, amide and amine salts of phosphorodithioate coupled carboxylic anhydrides have been found to be effective multifunctional antiwear and antioxidant additives for lubricants.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: May 28, 1991
    Assignee: Mobil Oil Corporation
    Inventors: Liehpao O. Farng, John P. Doner, Andrew G. Horodysky