Patents by Inventor Edwin W. Lehmann

Edwin W. Lehmann 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).

  • Chemical compositions and their use as fuel additives
    Patent number: 5425789
    Abstract: A compound of the general formula ##STR1## where X is CONR.sub.2 or CO.sub.2.sup.- + H.sub.2 NR.sub.2Y and Z are the same or different and selected from the group consisting of CONR.sub.2,CO.sub.2 R, OCOR, --OR, --R, --NCOR andone of Y or Z may be absent andR is selected from the group consisting of alkyl, alkoxy alkyl or polyalkoxyalkyl preferably containing at least 10 carbon atoms in the main chain.
    Type: Grant
    Filed: April 28, 1993
    Date of Patent: June 20, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Kenneth Lewtas, Edwin W. Lehmann, David P. Gillingham, John E. Maddox
  • Testing apparatus and method
    Patent number: 5117679
    Abstract: A test device for assessing low temperature performance of a wax-containing fuel which compriss: a vessel for containing a fuel to be assessed, having cooling and heating elements, for cooling and heating the fuel in the vessel and a filter element wherein the fuel is caused to pass through the filter of the filter element and the cooling and heating elements are so arranged that a stable convection current is set up in the fuel and the filter is so positioned that it receives wax settling from the fuel.
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: June 2, 1992
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Kenneth Lewtas, Edwin W. Lehmann, John N. Mears, Brian H. Wiggins, Leslie G. Jones