Granted Patent
Utility
US 4,830,770 · App. 07/137,269
Hydraulic fluid compositions, novel glucamine derivatives and complex compounds containing same
Inventors:
Hermann O. Wirth, Hans-Helmut Friedrich
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Dec 23, 1987
Inventors
Hermann O. Wirth
Hans-Helmut Friedrich
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.