Patents by Inventor Shreyasi Lahiri

Shreyasi Lahiri 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).

  • Method of lubricating and lubricating compositions thereof
    Patent number: 8435932
    Abstract: The present invention relates to a method of lubricating a mechanical device by using a lubricating composition containing a thiadiazole-functionalised dispersant. The invention further provides a lubricating composition suitable for the mechanical device containing a thiadiazole-functionalised dispersant and a polysulphide.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: May 7, 2013
    Assignee: The Lubrizol Corporation
    Inventors: Mark R. Baker, Shreyasi Lahiri, Gabriel B. Rhoads
  • Product of amines with hydroxy acid as friction modifiers suitable for automatic transmission fluids
    Patent number: 8148306
    Abstract: Compositions comprising an oil of lubricating viscosity; an amide represented by the formula R1R2N—C(O)R3 wherein R1 and R2 are hydrocarbyl groups of at least 6 carbon atoms and R3 is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent; a nitrogen-containing dispersant; and a phosphorus-containing compound are suitable for lubricating a transmission.
    Type: Grant
    Filed: October 11, 2006
    Date of Patent: April 3, 2012
    Assignee: The Lubrizol Corporation
    Inventors: Stuart L. Bartley, Shreyasi Lahiri, Mark R. Baker, Craig D. Tipton
  • Multifunctional Driveline Fluid
    Publication number: 20100130390
    Abstract: A composition including 1 to 20 weight percent of a compound having a traction coefficient of at least about 0.045, at least 50 weight percent of an oil of lubricating viscosity, a phosphorus compound and 2,5-dimercapto-1,3,4-thiadiazole or a derivative thereof, and having a kinematic viscosity at 100° C. of up to about 12 mm2/sec, is suitable for lubricating a transmission.
    Type: Application
    Filed: March 12, 2008
    Publication date: May 27, 2010
    Applicant: The Lubrizol Corporation
    Inventors: Craig D. Tipton, James L. Sumiejski, Shreyasi Lahiri
  • Method of Lubricating and Lubricating Compositions Thereof
    Publication number: 20100016189
    Abstract: The present invention relates to a method of lubricating a mechanical device by using a lubricating composition containing a thiadiazole-functionalised dispersant. The invention further provides a lubricating composition suitable for the mechanical device containing a thiadiazole-functionalised dispersant and a polysulphide.
    Type: Application
    Filed: July 25, 2007
    Publication date: January 21, 2010
    Applicant: The Lubrizol Corporation
    Inventors: Mark R. Baker, Shreyasi Lahiri, Gabriel B. Rhoads
  • Product of Amines with Hydroxy Acid as Friction Modifiers Suitable for Automatic Transmission Fluids
    Publication number: 20090312207
    Abstract: Compositions comprising an oil of lubricating viscosity; an amide represented by the formula R1R2N—C(O)R3 wherein R1 and R2 are hydrocarbyl groups of at least 6 carbon atoms and R3 is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent; a nitrogen-containing dispersant; and a phosphorus-containing compound are suitable for lubricating a transmission.
    Type: Application
    Filed: October 11, 2006
    Publication date: December 17, 2009
    Inventors: Stuart L. Bartley, Shreyasi Lahiri, Mark R. Baker, Craig D. Tipton
  • Secondary and tertiary amines as friction modifiers for automatic transmission fluids
    Patent number: 7618929
    Abstract: A composition of a major amount of an oil of lubricating viscosity; a secondary or tertiary amine being represented by the formula R1R2NR3 wherein R1 and R2 are alkyl groups of at least 6 carbon atoms and R3 is hydrogen, a hydrocarbyl group, a hydroxyl-containing alkyl group, or an amine-containing alkyl group; and a dispersant, provides high static coefficients of friction and a durable positive slope during oxidative and mechanical stressing, particularly as a friction component of an automatic transmission.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: November 17, 2009
    Assignee: The Lubrizol Corporation
    Inventors: Craig D. Tipton, Mark R. Baker, Shreyasi Lahiri, William D. Abraham, Richard J. Vickerman, Suzanne M. Patterson
  • Secondary and tertiary amines as friction modifiers for automatic transmission fluids
    Patent number: 7439213
    Abstract: A composition of a major amount of an oil of lubricating viscosity; a secondary or tertiary amine being represented by the formula R1R2NR3 wherein R1 and R2 are alkyl groups of at least 6 carbon atoms and R3 is hydrogen, a hydrocarbyl group, a hydroxyl-containing alkyl group, or an amine-containing alkyl group; and a dispersant, provides high static coefficients of friction and a durable positive slope during oxidative and mechanical stressing, particularly as a friction component of an automatic transmission.
    Type: Grant
    Filed: October 19, 2004
    Date of Patent: October 21, 2008
    Assignee: The Lubrizol Corporation
    Inventors: Craig D. Tipton, Mark R. Baker, Shreyasi Lahiri
  • Friction modifiers for improved anti-shudder performance and high static friction in transmission fluids
    Patent number: 7381691
    Abstract: A fluid composition of (a) a friction modifier derived from the reaction of a carboxylic acid or a reactive equivalent thereof with an aminoalcohol, the friction modifier containing at least two hydrocarbyl groups; and (b) a dispersant other than a species of (a), provides good friction properties to an automatic transmission.
    Type: Grant
    Filed: July 11, 2003
    Date of Patent: June 3, 2008
    Assignee: The Lubrizol Corporation
    Inventors: Paul E. Adams, Craig D. Tipton, Shreyasi Lahiri, James H. Bush, James C. Ray, David J. Aaserud
  • Secondary and Tertiary Amines as Friction Modifiers for Automatic Transmission Fluids
    Publication number: 20060172899
    Abstract: A composition of a major amount of an oil of lubricating viscosity; a secondary or tertiary amine being represented by the formula R1R2NR3 wherein R1 and R2 are alkyl groups of at least 6 carbon atoms and R3 is hydrogen, a hydrocarbyl group, a hydroxyl-containing alkyl group, or an amine-containing alkyl group; and a dispersant, provides high static coefficients of friction and a durable positive slope during oxidative and mechanical stressing, particularly as a friction component of an automatic transmission.
    Type: Application
    Filed: April 12, 2006
    Publication date: August 3, 2006
    Applicant: The Lubrizol Corporation
    Inventors: Craig Tipton, Mark Baker, Shreyasi Lahiri, William Abraham, Richard Vickerman, Suzanne Patterson
  • Secondary and tertiary amines as friction modifiers for automatic transmission fluids
    Publication number: 20060084583
    Abstract: A composition of a major amount of an oil of lubricating viscosity; a secondary or tertiary amine being represented by the formula R1R2NR3 wherein R1 and R2 are alkyl groups of at least 6 carbon atoms and R3 is hydrogen, a hydrocarbyl group, a hydroxyl-containing alkyl group, or an amine-containing alkyl group; and a dispersant, provides high static coefficients of friction and a durable positive slope during oxidative and mechanical stressing, particularly as a friction component of an automatic transmission.
    Type: Application
    Filed: October 19, 2004
    Publication date: April 20, 2006
    Applicant: The Lubrizol Corporation
    Inventors: Craig Tipton, Mark Baker, Shreyasi Lahiri
  • Friction modifiers for improved anti-shudder performance and high static friction in transmission fluids
    Publication number: 20050250655
    Abstract: A fluid composition of (a) a friction modifier derived from the reaction of a carboxylic acid or a reactive equivalent thereof with an aminoalcohol, the friction modifier containing at least two hydrocarbyl groups; and (b) a dispersant other than a species of (a), provides good friction properties to an automatic transmission.
    Type: Application
    Filed: July 11, 2003
    Publication date: November 10, 2005
    Inventors: Paul Adams, Craig Tipton, Shreyasi Lahiri, James Bush
  • Multifunctional dispersants
    Publication number: 20050041395
    Abstract: A multifunctional dispersant useful in lubricating compositions is prepared by heating together (a) a dispersant and (b) 2,5-dimercapto-1,3,4-thiadiazole or a hydrocarbyl-substituted 2,5-dimercapto-1,3,4-thiadiazole which is substantially insoluble in a hydrocarbon oil of lubricating viscosity at 25° C., and further either (c) a borating agent or (d) an inorganic phosphorus compound, or both (c) and (d). The heating is sufficient to provide a reaction product of (a), (b), and (c) or (d) which is soluble in hydrocarbon oil at 25° C.
    Type: Application
    Filed: August 21, 2003
    Publication date: February 24, 2005
    Applicant: The Lubrizol Corporation
    Inventors: Craig Tipton, Shreyasi Lahiri, Mark Baker