Granted Patent
Utility
US 4,456,008 · App. 06/417,226
Respiratory apparatus and method
Inventors:
Burrell E. Clawson, James Weigl
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Sep 13, 1982
Inventors
Burrell E. Clawson
James Weigl
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.