Granted Patent
Utility
US 4,814,007 · App. 06/819,778
Recovery of precious metals
Inventors:
Wilson L. Lin, Phillip L. Mattison, Michael J. Virnig
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Jan 16, 1986
Inventors
Wilson L. Lin
Phillip L. Mattison
Michael J. Virnig
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.