Granted Patent
Utility
US 5,900,374 · App. 08/959,488
Cell culture harvesting device
Inventor:
Hans Otto-Nagels
Patented Case
View Patent ↗
Granted: May 4, 1999
Filed: Oct 28, 1997
Inventor
Hans Otto-Nagels
Assignee (at issue)
Heraeus Instruments GmbH & Co. KG
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.