Granted Patent
Utility
US 5,433,873 · App. 08/140,574
Phosphorus-free lubricant additives
Inventor:
Hugo Camenzind
Patented Case
View Patent ↗
Granted: Jul 18, 1995
Filed: Oct 21, 1993
Inventor
Hugo Camenzind
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.