Granted Patent
Utility
US 4,527,557 · App. 06/667,115
Medical ventilator system
Inventors:
Douglas F. DeVries, Arie Cohen
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Nov 1, 1984
Inventors
Douglas F. DeVries
Arie Cohen
Assignee (at issue)
Bear Medical Systems, 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.