Granted Patent
Utility
US 5,878,744 · App. 08/898,257
Ventilator system and method of operating a ventilating system
Inventor:
Georg Pfeiffer
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Jul 22, 1997
Inventor
Georg Pfeiffer
Assignee (at issue)
Siemens Elema AB
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.