Granted Patent
Utility
US 4,257,913 · App. 06/076,523
Stable manganese salt solutions and a process for their production
Inventor:
Alfred Fischer
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Sep 17, 1979
Inventor
Alfred Fischer
Assignee (at issue)
Tenneco Chemicals, 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.