Granted Patent
Utility
US 4,371,054 · App. 06/106,186
Flow duct sound attenuator
Inventor:
Leslie S. Wirt
Patented Case
View Patent ↗
Granted: Feb 1, 1983
Filed: Dec 21, 1979
Inventor
Leslie S. Wirt
Assignee (at issue)
Lockheed Corporation
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.