Granted Patent
Utility
US 5,411,643 · App. 08/228,631
Integrated process of using chloric acid to separate zinc oxide and manganese oxide
Inventors:
David W. Cawlfield, Leslie R. Ward
Patented Case
View Patent ↗
Granted: May 2, 1995
Filed: Apr 18, 1994
Inventors
David W. Cawlfield
Leslie R. Ward
Assignee (at issue)
Olin 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.