Granted Patent
Utility
US 5,286,397 · App. 07/836,333
Base oil for the lubricant industry
Inventors:
Karl Schmid, Frank Bongardt, Reinhold Wuest
Patented Case
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Granted: Feb 15, 1994
Filed: Mar 2, 1992
Inventors
Karl Schmid
Frank Bongardt
Reinhold Wuest
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.