Granted Patent
Utility
US 4,643,720 · App. 06/829,764
Drainage catheter
Inventor:
Andrew P. Lanciano
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Feb 14, 1986
Inventor
Andrew P. Lanciano
Assignee (at issue)
Medi-Tech Co., Ltd.
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.