Granted Patent
Utility
US 6,299,593 · App. 09/518,472
Double and multiple lumen chest drainage tube
Inventor:
Akio Wakabayashi
Patented Case
View Patent ↗
Granted: Oct 9, 2001
Filed: Mar 3, 2000
Inventor
Akio Wakabayashi
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.