Granted Patent
Utility
US 4,877,552 · App. 07/091,156
Corrosion inhibitor
Inventor:
Ulrich Haring
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Aug 28, 1987
Inventor
Ulrich Haring
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.