Granted Patent
Utility
US 5,328,621 · App. 08/140,573
Dithiophosphates as antiwear additives
Inventors:
Hugo Camenzind, Paul Dubs
Patented Case
View Patent ↗
Granted: Jul 12, 1994
Filed: Oct 21, 1993
Inventors
Hugo Camenzind
Paul Dubs
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.