Granted Patent
Utility
US 5,918,596 · App. 08/841,466
Special gas dose delivery apparatus for respiration equipment
Inventor:
Erkki Heinonen
Patented Case
View Patent ↗
Granted: Jul 6, 1999
Filed: Apr 22, 1997
Inventor
Erkki Heinonen
Assignee (at issue)
Instrumentarium Corporation
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.