Granted Patent
Utility
US 5,670,035 · App. 08/466,166
Method for recovering copper
Inventors:
Michael J. Virnig, J. Murdoch MacKenzie
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Jun 6, 1995
Inventors
Michael J. Virnig
J. Murdoch MacKenzie
Assignee (at issue)
Henkel Limited
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.