Granted Patent
Utility
US 4,342,258 · App. 06/159,653
Ventilator
Inventor:
Michel H. Zaniewski
Patented Case
View Patent ↗
Granted: Aug 3, 1982
Filed: Jun 16, 1980
Inventor
Michel H. Zaniewski
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.