Granted Patent
Utility
US 4,295,974 · App. 06/146,845
Blood sample collection and phase separation device
Inventor:
William D. Cornell
Patented Case
View Patent ↗
Granted: Oct 20, 1981
Filed: May 5, 1980
Inventor
William D. Cornell
Assignee (at issue)
Sherwood Medical Industries Inc.
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.