Granted Patent
Utility
US 4,268,686 · App. 06/136,614
Propylene oxide reaction products
Inventors:
Paul Schafer, Heinz Abel, Fritz Mayer
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Apr 2, 1980
Inventors
Paul Schafer
Heinz Abel
Fritz Mayer
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.