Patents by Inventor Patricia R. Todd

Patricia R. Todd 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).

  • Functionalized polymer as grease additive
    Patent number: 6300288
    Abstract: A grease of an oil of lubricating viscosity, a polyolefin having grafted acid functionality, a metallic species capable of interacting with the acid functionality of said polyolefin to cause association among the acid groups and a co-thickening agent, has improved rheological properties. The co-thickening agent and the metallic species can together comprise a gelled overbased material, particularly an overbased carboxylate.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: October 9, 2001
    Assignee: The Lubrizol Corporation
    Inventors: Curtis R. Scharf, Steven R. Twining, Patricia R. Todd
  • Polyurea-thickened grease composition
    Patent number: 6214778
    Abstract: A grease composition comprising a major amount of an oil of lubricating viscosity; a thickener selected from the group consisting of monoureas, diureas, triureas and polyureas, or mixtures thereof; and an oil soluble neutral or overbased zinc salt of a carboxylic acid selected from the group consisting of zinc salts of fatty acids, the zinc salts of hydrocarbyl-substituted salicylic acids, and zinc glyoxylates is disclosed.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: April 10, 2001
    Assignee: The Lubrizol Corporation
    Inventor: Patricia R. Todd
  • Grease compositions
    Patent number: 5362409
    Abstract: Improved grease compositions comprise a major amount of an oil based metal soap thickened base grease selected from the group consisting of complex and failed complex greases, at least one sulfur and phosphorus containing composition alone or together with an overbased metal salt of an organic acid and a hydrocarbyl phosphite, in amounts sufficient to increase the dropping point of the base grease, as measured by ASTM Procedure D-2265 by at least 15.degree. C., the phosphorus and sulfur compound being described in detail herein.
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: November 8, 1994
    Assignee: The Lubrizol Corporation
    Inventors: Gary W. Wiggins, Edward J. Konzman, James N. Vinci, Patricia R. Todd
  • Grease compositions
    Patent number: 5256320
    Abstract: Improved grease compositions comprise a major amount of an oil based simple metal soap thickened base grease, an overbased metal salt of an organic acid, at least one sulfur and phosphorus containing composition and a hydrocarbyl phosphite, together in amounts sufficient to increase the dropping point of the base grease, as measured by ASTM Procedure D-2265 by at least 50.degree. C., the phosphorus and sulfur compound being described in detail herein.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: October 26, 1993
    Assignee: The Lubrizol Corporation
    Inventors: Patricia R. Todd, James N. Vinci
  • Grease compositions
    Patent number: 5256321
    Abstract: Improved grease compositions substantially free of boron and boron-containing compounds, comprise a major amount of an oil based simple metal soap thickened base grease and a minor amount of at least one sulfur and phosphorus containing composition sufficient to increase the dropping point of the base grease, as measured by ASTM Procedure D-2265 by at least 30.degree. C., the phosphorus and sulfur compound being described in detail herein.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: October 26, 1993
    Assignee: The Lubrizol Corporation
    Inventor: Patricia R. Todd