Granted Patent
Utility
US 5,611,721 · App. 08/573,674
Sound producing device
Inventors:
Michael G. Hoeting, Sean Mullaney
Patented Case
View Patent ↗
Granted: Mar 18, 1997
Filed: Dec 18, 1995
Inventors
Michael G. Hoeting
Sean Mullaney
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.