Granted Patent
Utility
US 6,526,977 · App. 09/446,845
Tracheal breathing apparatus
Inventor:
Fred Göbel
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: Mar 16, 2000
Inventor
Fred Göbel
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.