Granted Patent
Utility
US 5,750,028 · App. 08/715,199
Biomass separation apparatus and method with media return
Inventor:
Sam Frisch
Patented Case
View Patent ↗
Granted: May 12, 1998
Filed: Sep 18, 1996
Inventor
Sam 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.