Granted Patent
Utility
US 4,454,027 · App. 06/408,078
Arsenic removal method
Inventor:
Donald M. Fenton
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Aug 16, 1982
Inventor
Donald M. Fenton
Assignee (at issue)
Union Oil Company of California
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.