Granted Patent
Utility
US 4,699,701 · App. 06/924,573
Electrochemical removal of chromium from chlorate solutions
Inventor:
Marek Lipsztajn
Patented Case
View Patent ↗
Granted: Oct 13, 1987
Filed: Oct 29, 1986
Inventor
Marek Lipsztajn
Assignee (at issue)
Tenneco Canada Inc. (ERCO division)
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.