Granted Patent
Utility
US 6,458,750 · App. 09/868,309
Engine oil composition with reduced deposit-formation tendency
Inventors:
Alexander Dardin, Klaus Hedrich, Stephan Massoth, Boris Eisenberg, Stephan Fengler
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Jun 18, 2001
Inventors
Alexander Dardin
Klaus Hedrich
Stephan Massoth
Boris Eisenberg
Stephan Fengler
Assignee (at issue)
RohMax Additives GmbH
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.