Granted Patent
Utility
US 6,464,901 · App. 09/565,397
Halogen resistant copper corrosion inhibitors
Inventor:
Longchun Cheng
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: May 5, 2000
Inventor
Longchun Cheng
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.