Granted Patent
Utility
US 6,119,521 · App. 09/062,906
Apparatus and method for measuring the acoustic properties of acoustic absorbers
Inventors:
Belur N. Shivashankara, Fredrick M. Hutto, Noe Arcas, Charles A. Parente, Ronald F. Olsen
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Apr 20, 1998
Inventors
Belur N. Shivashankara
Fredrick M. Hutto
Noe Arcas
Charles A. Parente
Ronald F. Olsen
Assignee (at issue)
NORTHROP GRUMMAN 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.