Granted Patent
Utility
US 4,913,401 · App. 07/302,187
Valve apparatus
Inventor:
Patrick M. Handke
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Jan 26, 1989
Inventor
Patrick M. Handke
Assignee (at issue)
Respironics, Inc.
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.