Granted Patent
Utility
US 4,909,346 · App. 07/372,051
Jet engine noise suppression system
Inventor:
Delbert W. Torkelson
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Jun 27, 1989
Inventor
Delbert W. Torkelson
Assignee (at issue)
The NORDAM Group LLC
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.