Granted Patent
Utility
US 6,772,856 · App. 10/167,459
Fine jet control-type sound absorption system
Inventor:
Tatsuya Ishii
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Jun 13, 2002
Inventor
Tatsuya Ishii
Assignee (at issue)
National Aerospace Laboratory of Japan
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.