Granted Patent
Utility
US 6,214,235 · App. 09/055,461
Process for removal of quaternary ammonium salt
Inventor:
James Manio Silva
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Apr 6, 1998
Inventor
James Manio Silva
Assignee (at issue)
General Electric Company
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.