Granted Patent
Utility
US 4,844,826 · App. 07/245,824
Use of organosilicon compounds to thicken oils
Inventors:
Dietmar Schaefer, Klaus Hoffmann
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Sep 16, 1988
Inventors
Dietmar Schaefer
Klaus Hoffmann
Assignee (at issue)
Th. Goldschmidt. AG
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.