Granted Patent
Utility
US 4,409,977 · App. 06/280,703
High frequency ventillator
Inventors:
Jose Bisera, Max Harry Weil
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Jul 6, 1981
Inventors
Jose Bisera
Max Harry Weil
Assignee (at issue)
Institute of Critical Care Medicine
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.