Granted Patent
Utility
US 5,114,448 · App. 07/773,148
Air filtering apparatus
Inventor:
Bradley W. Bartilson
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Oct 8, 1991
Inventor
Bradley W. Bartilson
Assignee (at issue)
Cray Research, 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.