Granted Patent
Utility
US 4,214,874 · App. 06/010,234
Combination and method for mixing the contents of a blood collection tube and thereafter removing the mixing element
Inventor:
Fred K. White
Patented Case
View Patent ↗
Granted: Jul 29, 1980
Filed: Feb 8, 1979
Inventor
Fred K. White
Assignee (at issue)
American Hospital Supply Corp.
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.