Granted Patent
Utility
US 6,820,462 · App. 10/384,940
Acoustic gas monitor
Inventor:
Erik Cardelius
Patented Case
View Patent ↗
Granted: Nov 23, 2004
Filed: Mar 10, 2003
Inventor
Erik Cardelius
Assignee (at issue)
Maquet Critical Care AB
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.