Granted Patent
Utility
US 6,706,521 · App. 09/930,894
Bed cleaning system for fluidized-bed bioreactors
Inventor:
Samuel Frisch
Patented Case
View Patent ↗
Granted: Mar 16, 2004
Filed: Aug 16, 2001
Inventor
Samuel Frisch
Assignee (at issue)
Envirogen, 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.