Patents by Inventor David G. Lammel

David G. Lammel 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).

  • Hydrocracking process with polycyclic aromatic dimer removal
    Patent number: 5232577
    Abstract: A process for separation and removal of stable polycyclic aromatic dimer foulants from refinery process streams by blending a paraffinic stream with a portion of heavy effluent from a hydrocracking reactor to induce precipitation of foulant, which may then be separated and removed from the hydrocracker. Additional embodiments include introduction of flocculating agents and adjusting the temperature of the blend.
    Type: Grant
    Filed: August 14, 1990
    Date of Patent: August 3, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: John C. Fetzer, John M. Rosenbaum, Robert W. Bachtel, Dennis R. Cash, David G. Lammel
  • Hydrocracking process with polynuclear aromatic dimer foulant adsorption
    Patent number: 5190633
    Abstract: A process for separation and removal of stable polycyclic aromatic dimer foulants from refinery process streams by selectively adsorbing the foulants while eluting non-fouling smaller-ringed aromatics. Synchronous Scanning Fluorescence may be used in the identification and monitoring of the stable polycyclic aromatic dimers.
    Type: Grant
    Filed: March 19, 1992
    Date of Patent: March 2, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: John C. Fetzer, David G. Lammel