Granted Patent
Utility
US 4,840,171 · App. 07/204,873
Oxygen supply unit having an oxygen generator
Inventors:
Holmer Rohling, Frank Joseph Schulz, Siegfried Preininger
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Jun 10, 1988
Inventors
Holmer Rohling
Frank Joseph Schulz
Siegfried Preininger
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.