Granted Patent
Utility
US 5,229,556 · App. 07/894,888
Internal ported band pass enclosure for sound cancellation
Inventor:
Earl R. Geddes
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Jun 8, 1992
Inventor
Earl R. Geddes
Assignee (at issue)
Ford Motor Company
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.