Granted Patent
Utility
US 4,752,286 · App. 06/809,533
Balloon tube for treating esophagus varix
Inventor:
Yosuke Okada
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Dec 16, 1985
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.