Granted Patent
Utility
US 4,392,858 · App. 06/283,702
Wound drainage device
Inventors:
Robert George, Georgio di Palma
Patented Case
View Patent ↗
Granted: Jul 12, 1983
Filed: Jul 16, 1981
Inventors
Robert George
Georgio di Palma
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.