Granted Patent
Utility
US 5,385,141 · App. 07/869,802
Speech diaphragm and exhalation valve
Inventor:
Nino Granatiero
Patented Case
View Patent ↗
Granted: Jan 31, 1995
Filed: Apr 16, 1992
Inventor
Nino Granatiero
Assignee (at issue)
Siebe North, Inc.
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.