Granted Patent
Utility
US 6,291,020 · App. 08/694,148
Composition and process for treating metal surfaces
Inventors:
Jeffrey I. Melzer, Richard J. Sujdak
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Aug 8, 1996
Inventors
Jeffrey I. Melzer
Richard J. Sujdak
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.