Granted Patent
Utility
US 6,770,189 · App. 09/981,140
Process for improving the purity of quaternary ammonium hydroxides by electrolysis
Inventors:
Anna Giatti, Fred Korpel, Roger Keranen Rains, Gerrit Jan Boerman
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Oct 16, 2001
Inventors
Anna Giatti
Fred Korpel
Roger Keranen Rains
Gerrit Jan Boerman
Assignee (at issue)
Flexsys B.V.
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.