Granted Patent
Utility
US 4,590,059 · App. 06/749,265
Process for the production of manganese dioxide
Inventor:
Geoffrey W. Mellors
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Jun 27, 1985
Inventor
Geoffrey W. Mellors
Assignee (at issue)
Union Carbide 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.