Granted Patent
Utility
US 4,435,338 · App. 06/303,748
Dithiophosphates
Inventors:
Klaus-Peter Michaelis, Rainer Schneider
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Sep 21, 1981
Inventors
Klaus-Peter Michaelis
Rainer Schneider
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.