Patents by Inventor Carl F. Stachew

Carl F. Stachew 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).

  • Modified polyisobutylene succinimide dispersants having improved seal, sludge, and deposit performance
    Patent number: 6770605
    Abstract: A composition suitable for reducing sludge and degradation of elastomer seals in engines comprises an oil of lubrication viscosity and a minor amount of a sludge preventing/seal protecting nitrogen containing dispersant, which is a reaction product of a hydrocarbyl-substituted succinic acylating agent having a limited amount of low molecular weight substituent; and a polyamine or condensed polyamine containing less than 20 mole percent of polyamine components of 6 or fewer nitrogen atoms.
    Type: Grant
    Filed: September 11, 2000
    Date of Patent: August 3, 2004
    Assignee: The Lubrizol Corporation
    Inventors: Carl F. Stachew, Gordon D. Lamb, William D. Abraham, Mary Galic Raguz
  • Modified polyisobutylene succinimide dispersants having improved seal, sludge, and deposit performance
    Publication number: 20030171225
    Abstract: A composition suitable for reducing sludge and degradation of elastomer seals in engines comprises an oil of lubrication viscosity and a minor amount of a sludge preventing/seal protecting nitrogen containing dispersant, which is a reaction product of a hydrocarbyl-substituted succinic acylating agent having a limited amount of low molecular weight substituent; and a polyamine or condensed polyamine containing less than 20 mole percent of polyamine components of 6 or fewer nitrogen atoms.
    Type: Application
    Filed: March 3, 2003
    Publication date: September 11, 2003
    Applicant: The Lubrizol Corporation
    Inventors: Carl F. Stachew, Gordon D. Lamb, William D. Abraham, Mary Galic Raguz
  • Engine oil having dispersant and aldehyde/epoxide for improved seal performance, sludge and deposit performance
    Patent number: 6207624
    Abstract: Disclosed is a lubricating composition having a major amount of an oil of lubrication viscosity and a minor amount of (A) a nitrogen containing dispersant with a total base number of from 20 to 160 on an oil-free basis wherein the improvement comprises adding to said dispersant; (B) a sludge preventing/seal protecting additive of at least one aldehyde or epoxide or mixtures thereof.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: March 27, 2001
    Assignee: The Lubrizol Corporation
    Inventors: Carl F. Stachew, William D. Abraham, James A. Supp, James R. Shanklin, Gordon David Lamb
  • Engine oil having dithiocarbamate and aldehyde/epoxide for improved seal performance, sludge and deposit performance
    Patent number: 6121211
    Abstract: Disclosed is a lubricating composition having a major amount of an oil of lubrication viscosity and a minor amount of(A) at least one thiocarbamate wherein the improvement comprises adding to said thiocarbamate(B) a sludge preventing and seal protecting amount of at least one aldehyde or epoxide or mixtures thereof.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: September 19, 2000
    Assignee: The Lubrizol Corporation
    Inventors: Carl F. Stachew, William D. Abraham, James A. Supp, James R. Shanklin, Gordon David Lamb
  • Alcohol borate esters to improve bearing corrosion in engine oils
    Patent number: 6010986
    Abstract: Disclosed is a composition for reducing the copper-lead bearing corrosion of a formulation that includes a major amount of an oil of lubrication viscosity and a minor amount of a corrosion-reducing additive comprising:(A) a dispersant with a total base number of from 20 to 160 on an oil-free basis, with the proviso that the dispersant is substantially boron-free;(B) a metal salt of a phosphorus acid; and(C) a metal overbased composition comprising at least one carboxylate, phenate, or sulfonate wherein the metal is lithium, sodium, potassium, magnesium or calcium, and wherein the improvement comprises(D) a borate ester.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: January 4, 2000
    Assignee: The Lubrizol Corporation
    Inventors: Carl F. Stachew, James R. Shanklin
  • Alcohol borate esters and borated dispersants to improve bearing corrosion in engine oils
    Patent number: 6008165
    Abstract: 1. A composition for reducing the copper-lead bearing corrosion of a formulation that includes a major amount of an oil of lubrication viscosity and a minor amount of a corrosion-reducing additive comprising(A) a borated dispersant with a total base number of from 20 to 160 on an oil-free basis;(B) a metal salt of a phosphorus acid; and(C) a metal overbased composition comprising at least one carboxylate, phenate, or sulfonate wherein the metal is lithium, sodium, potassium, magnesium or calcium, and wherein the improvement comprises(D) a borate ester.The borated ester and borated dispersant provide from 20 to about 800 parts per million (ppm) mass of boron in the composition.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: December 28, 1999
    Assignee: The Lubrizol Corporation
    Inventors: James R. Shanklin, Carl F. Stachew