Granted Patent
Utility
US 4,263,157 · App. 06/031,281
Chlorinated derivatives of butyric acid as useful lubricant additives and lubricants containing same
Inventors:
Eginhard Steiner, Andreas Schmidt
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: Apr 18, 1979
Inventors
Eginhard Steiner
Andreas Schmidt
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.