Granted Patent
Utility
US 6,784,307 · App. 10/188,692
In situ process for preparing quaternary ammonium bicarbonates and quaternary ammonium carbonates
Inventor:
Leigh E. Walker
Patented Case
View Patent ↗
Granted: Aug 31, 2004
Filed: Jul 2, 2002
Inventor
Leigh E. Walker
Assignee (at issue)
LONZA LTD
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.