Granted Patent
Utility
US 5,269,927 · App. 07/808,312
Separation device for use in blood collection tubes
Inventor:
William R. Fiehler
Patented Case
View Patent ↗
Granted: Dec 14, 1993
Filed: Dec 16, 1991
Inventor
William R. Fiehler
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.