Granted Patent
Utility
US 5,756,047 · App. 08/572,328
Air purification method
Inventors:
Donald E. West, Richard E. Wickham
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: Dec 14, 1995
Inventors
Donald E. West
Richard E. Wickham
Assignee (at issue)
Advanced Chemical Systems, 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.