Granted Patent
Utility
US 6,770,062 · App. 10/213,785
Automatic high negative pressure relief valve and chest drainage units using same
Inventors:
Trinh Phung, Daniel A. Boardman
Patented Case
View Patent ↗
Granted: Aug 3, 2004
Filed: Aug 7, 2002
Inventors
Trinh Phung
Daniel A. Boardman
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.