Granted Patent
Utility
US 6,787,021 · App. 10/038,537
Purification of onium hydroxides by electrodialysis
Inventors:
Robert Reiter, Kelly Hefner
Patented Case
View Patent ↗
Granted: Sep 7, 2004
Filed: Jan 3, 2002
Inventors
Robert Reiter
Kelly Hefner
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.