Granted Patent
Utility
US 5,612,421 · App. 08/611,152
Methods and compositions for pretreatment of metals
Inventors:
Alan E. Goliaszewski, David W. Reichgott, Lothar S. Sander
Patented Case
View Patent ↗
Granted: Mar 18, 1997
Filed: Mar 5, 1996
Inventors
Alan E. Goliaszewski
David W. Reichgott
Lothar S. Sander
Assignee (at issue)
Betzdearborn, Inc.
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.