Granted Patent
Utility
US 5,158,622 · App. 07/654,159
Method and composition for treatment of aluminum
Inventors:
David W. Reichgott, Fu Chen
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Feb 12, 1991
Inventors
David W. Reichgott
Fu Chen
Assignee (at issue)
Betz Laboratories, 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.