Granted Patent
Utility
US 4,493,614 · App. 06/534,988
Pump for a portable ventilator
Inventors:
Raymond D. Chu, Marc A. Bergman
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Sep 27, 1983
Inventors
Raymond D. Chu
Marc A. Bergman
Assignee (at issue)
Lifecare Services, Inc.
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.