Granted Patent
Utility
US 6,009,871 · App. 08/968,069
Ventilating apparatus
Inventors:
Siegfried Kiske, Karsten Hoffmann
Patented Case
View Patent ↗
Granted: Jan 4, 2000
Filed: Nov 12, 1997
Inventors
Siegfried Kiske
Karsten Hoffmann
Assignee (at issue)
DRAGERWERK AKTIEGESELLSCHAFT
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.