Patents by Inventor John E. Peffer

John E. Peffer 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 determining knock resistance rating for non-commercial grade natural gas
    Patent number: 6061637
    Abstract: A method for calculating knock resistance ratings for various blends of non-commercial grade natural gas involves the use of a computer model derived from collecting experimental data for constituent concentration levels typical in field grade natural gas. The computer model is derived using a MN (methane number) calibration curve for various natural gas compositions typical at the wellhead. The empirically-derived computer model considers concentrations of the following molar constituents: methane (60%-100%); ethane (0%-20%); propane (0%-40%); normal butane (0%-10%); normal pentane (0%-3%); mixtures of higher order hydrocarbons (0%-2%); nitrogen (0%-15%) and carbon dioxide (0%-10%). The knock characteristics of isomers of butane and pentane are accounted for by assigning fractions of their concentrations to concentrations of modeled constituents.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: May 9, 2000
    Assignee: Dresser Industries, Inc.
    Inventors: Gregory W. Sorge, Richard J. Kakoczki, John E. Peffer