Patents by Inventor Lisa P. Hawker

Lisa P. Hawker 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 for removing calcium from crude oil
    Patent number: 6905593
    Abstract: A calcium-containing hydrocarbonaceous material is treated with an aqueous mixture, comprising acetate ion and an alkaline material and having a pH in the range of 3.0 to 5.0, in order to extract at least a portion of the calcium from the hydrocarbonaceous material into the aqueous phase. Acetic acid is a suitable source of acetate ion. Ammonium hydroxide, sodium hydroxide and potassium hydroxide are example alkaline materials.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: June 14, 2005
    Assignee: Chevron U.S.A.
    Inventors: Donald L. Kuehne, Lisa P. Hawker, David C. Kramer