Granted Patent
Utility
US 5,215,574 · App. 07/816,997
Method of improving precious metal yield in a Merrill-Crowe recovery process
Inventors:
Suzanne L. Kladder, Terrence W. Mattioli, Gary E. Geiger, James E. Cressman
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jan 3, 1992
Inventors
Suzanne L. Kladder
Terrence W. Mattioli
Gary E. Geiger
James E. Cressman
Assignee (at issue)
Betz Laboratories, 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.