Granted Patent
Utility
US 5,028,259 · App. 07/490,018
Recovery of precious metal
Inventors:
Lon-Tang Wilson Lin, Phillip L. Mattison, Michael J. Virnig
Patented Case
View Patent ↗
Granted: Jul 2, 1991
Filed: Mar 6, 1991
Inventors
Lon-Tang Wilson Lin
Phillip L. Mattison
Michael J. Virnig
Assignee (at issue)
Henkel Research Corporation
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.