Patents by Inventor Gregory Peter Liesen

Gregory Peter Liesen 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).

  • Alkyl (meth) acrylate copolymers
    Publication number: 20040092409
    Abstract: Alkyl (meth) acrylate copolymers comprising from about 10 to about 23 weight percent C3-C7 alkyl (meth) acrylate; from about 77 to about 90 weight percent C12-C14 alkyl (meth) acrylate(s); and from 0 to about 6 weight percent of at least one C6-C20 alkyl (meth) acrylate, which provide excellent low temperature properties and shear stability to lubricating oils. The preferred embodiment comprises butyl (meth) acrylate as the C3-C7 alkyl (meth) acrylate, and is essentially free from methyl (meth) acrylate.
    Type: Application
    Filed: November 11, 2002
    Publication date: May 13, 2004
    Inventor: Gregory Peter Liesen
  • (Meth) acrylate copolymers having excellent low temperature properties
    Patent number: 5955405
    Abstract: Non-dispersant poly (meth) acrylate copolymers comprising from about 5 to about 15 weight percent butyl methacrylate; from about 70 to about 90 weight percent of a C10-C15 alkyl (meth) acrylate; and from about 5 to about 10 weight percent of a C16-C30 alkyl (meth) acrylate provide excellent low temperature properties to lubricating oils.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: September 21, 1999
    Assignee: Ethyl Corporation
    Inventors: Gregory Peter Liesen, Sanjay Srinivasan, Larry Dale Grina