Granted Patent
Utility
US 4,655,928 · App. 06/543,191
Membrane processes for metal recovery and pollution control in metal process industries
Inventors:
Everett C. Milton, Harry P. Gregor
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Oct 18, 1983
Inventors
Everett C. Milton
Harry P. Gregor
Assignee (at issue)
GnB
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.