Granted Patent
Utility
US 4,323,086 · App. 06/129,369
Pressure responsive flow control apparatus for breathing system
Inventor:
Donald R. Gneiding
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Mar 11, 1980
Inventor
Donald R. Gneiding
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.