Granted Patent
Utility
US 4,828,741 · App. 07/135,964
N-substituted tetrahydroquinolines for use as antioxidants in lubricants
Inventors:
Hans-Rudolf Meier, Samuel Evans
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Dec 21, 1987
Inventors
Hans-Rudolf Meier
Samuel Evans
Assignee (at issue)
Ciba-Geigy
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.