Patents by Inventor Thorkild F. Lonstrup

Thorkild F. Lonstrup 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).

  • Lubricating oil composition containing a dispersing-varnish inhibiting combination of an oxazoline compound and an acyl nitrogen compound
    Patent number: 4113639
    Abstract: The combination of an oil-soluble oxazoline reaction product having a (M.sub.n) of from about 1,000 to 3500, e.g., the reaction product of polybutenyl succinic anhydride with tris(hydroxymethyl) aminomethane and an oil-soluble acylated nitrogen compound having a (M.sub.n) of from about 1300 to 8,000, e.g. polybutenyl succinic anhydride reacted with tetraethylene pentamine which nitrogen compound can be borated, if desired, are surprisingly useful as combined additives for lubricating oils to increase the dispersancy and varnish inhibition properties of said oil when one part per weight of said oxazoline reaction product is combined with from 0.2 to 4, preferably 1 to 3, parts by weight of said acylated nitrogen compound.
    Type: Grant
    Filed: November 11, 1976
    Date of Patent: September 12, 1978
    Assignee: Exxon Research & Engineering Co.
    Inventors: Thorkild F. Lonstrup, Darrell W. Brownawell, Edward Goletz, Jr., Solomon J. Numair