Granted Patent
Utility
US 4,269,621 · App. 06/115,163
Use of heavy metal chelates of 2-mercaptopyridine-N-oxide to separate selected precious metals from acidic solutions
Inventors:
Joseph Reiner, Sigmund Breister
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Jan 24, 1980
Inventors
Joseph Reiner
Sigmund Breister
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.