Granted Patent
Utility
US 4,462,398 · App. 06/446,542
Respirating gas supply method and apparatus therefor
Inventors:
Gerald Durkan, Leonard M. Sieracki
Patented Case
View Patent ↗
Granted: Jul 31, 1984
Filed: Dec 3, 1982
Inventors
Gerald Durkan
Leonard M. Sieracki
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.