Granted Patent
Utility
US 6,626,753 · App. 09/797,905
Air return bulkhead
Inventor:
Gregory L. Onken
Patented Case
View Patent ↗
Granted: Sep 30, 2003
Filed: Mar 5, 2001
Inventor
Gregory L. Onken
Assignee (at issue)
ILLINOIS TOOL WORKS 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.