Granted Patent
Utility
US 4,832,014 · App. 07/106,811
Method and means for dispensing two respirating gases by effecting a known displacement
Inventor:
Warren E. Perkins
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Oct 13, 1987
Inventor
Warren E. Perkins
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.