Granted Patent
Utility
US 4,508,533 · App. 06/167,905
Surgical drain
Inventor:
Daniel J. Abramson
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: Jul 14, 1980
Inventor
Daniel J. Abramson
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.