Granted Patent
Utility
US 4,028,215 · App. 05/644,639
Manganese dioxide electrode
Inventors:
David L. Lewis, C. Richard Franks, deceased, Barry A. Schenker
Patented Case
View Patent ↗
Granted: Jun 7, 1977
Filed: Dec 29, 1975
Inventors
David L. Lewis
C. Richard Franks, deceased
Barry A. Schenker
Assignee (at issue)
Diamond Shamrock 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.