Granted Patent
Utility
US 6,214,221 · App. 09/255,186
Method and apparatus for purification of biological substances
Inventor:
Henry B. Kopf
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Feb 22, 1999
Inventor
Henry B. Kopf
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.