Granted Patent
Utility
US 6,646,147 · App. 10/074,251
Process for the dissolution of copper metal
Inventors:
Hugh W. Richardson, Gang Zhao
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Feb 14, 2002
Inventors
Hugh W. Richardson
Gang Zhao
Assignee (at issue)
Phibro Tech, 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.