Granted Patent
Utility
US 4,570,631 · App. 06/715,312
Respirating gas supply method and apparatus therefor
Inventor:
Gerald Durkan
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Mar 25, 1985
Inventor
Gerald Durkan
Assignee (at issue)
Kircaldie, Randall and McNab (As Trustee)
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.