Patents by Inventor Gary J Dechert

Gary J Dechert 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).

  • Measurement of distributed total acid numbers by electrospray mass spectrometry
    Patent number: 7723115
    Abstract: The present invention is a method to determine the TAN and TAN as a function of boiling point for a hydrocarbon feedstream using an electrospray ionization mass spectrometer (ESI-MS). The steps of the method include determining the signal as a function of mass from the ESI-MS while minimizing the formation of oligomers and fragmentation of the molecular species in the feedstream and then determining the TAN from the signals. The TAN is also determined as a function of boiling point.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: May 25, 2010
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Kuangnan Qian, Kathleen E. Edwards, Gary J. Dechert, Stephen B. Jaffe, Larry A. Green, William N. Olmstead
  • Method of producing molecular profiles of isoparaffins by low emitter current field ionization mass spectrometry
    Patent number: 7671328
    Abstract: The present invention is devoted to an analytical method for directly determining carbon number and molecular weight distributions of isoparaffin mixtures. The analytical means uses low in-scan emitter-current field-ionization mass spectroscopy to substantially reduced or eliminated molecular ion fragmentation for isoparaffins, which allows direct measurement of isoparaffin molecular ions for their distributions. The analytical means is capable of directly characterizing isobutane to C50+ isoparaffins, covering naphtha to gas oil ranges.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: March 2, 2010
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Chang Samuel Hsu, Gary J Dechert, Haven S. Aldrich, Gerald D. Dupre