Granted Patent
Utility
US 6,439,506 · App. 09/663,718
Ventilation valve with a breathing channel for a tank container of a helicopter
Inventors:
Werner Schlegel, Klaus Wojatschek
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Sep 15, 2000
Inventors
Werner Schlegel
Klaus Wojatschek
Assignee (at issue)
Eurocopter Deutschland GmbH
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.