Granted Patent
Utility
US 6,103,144 · App. 09/291,154
Halogen resistant copper corrosion inhibitors
Inventor:
Longchun Cheng
Patented Case
View Patent ↗
Granted: Aug 15, 2000
Filed: Apr 12, 1999
Inventor
Longchun Cheng
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.