Granted Patent
Utility
US 6,508,940 · App. 09/693,293
Process for recovering onium hydroxides from solutions containing onium compounds
Inventor:
Takao Niinobe
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: Oct 20, 2000
Inventor
Takao Niinobe
Assignee (at issue)
SACHEM, 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.