Granted Patent
Utility
US 6,328,791 · App. 09/563,821
Air filtration device
Inventors:
Lawrence M. Pillion, Anthony V. Cruz, Matt R. Ragland
Patented Case
View Patent ↗
Granted: Dec 11, 2001
Filed: May 3, 2000
Inventors
Lawrence M. Pillion
Anthony V. Cruz
Matt R. Ragland
Assignee (at issue)
Hamilton Beach/Proctor Silex, 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.