Granted Patent
Utility
US 4,801,294 · App. 06/936,868
Catheter for nasogastric intubation
Inventor:
Yosuke Okada
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Dec 2, 1986
Inventor
Yosuke Okada
Assignee (at issue)
Sherwood Medical Company
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.