Granted Patent
Utility
US 6,585,933 · App. 09/303,596
Method and composition for inhibiting corrosion in aqueous systems
Inventors:
William C. Ehrhardt, Longchun Cheng, Dawn Stasney, Kim A. Whitaker
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: May 3, 1999
Inventors
William C. Ehrhardt
Longchun Cheng
Dawn Stasney
Kim A. Whitaker
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.