Granted Patent
Utility
US 5,042,468 · App. 07/476,984
Breathing device
Inventor:
Hans Lambert
Patented Case
View Patent ↗
Granted: Aug 27, 1991
Filed: Feb 8, 1990
Inventor
Hans Lambert
Assignee (at issue)
Gibeck Respiration 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.