Granted Patent
Utility
US 5,246,607 · App. 07/420,348
Methylpolysiloxanes with quaternary ammonium groups as corrosion inhibitors for preparations consisting predominantly of water
Inventors:
Dietmar Schaefer, Werner Hohner
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Oct 12, 1989
Inventors
Dietmar Schaefer
Werner Hohner
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.