Granted Patent
Utility
US 4,947,803 · App. 07/348,848
Fludized bed reactor using capped dual-sided contact units and methods for use
Inventor:
Frederick A. Zenz
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: May 8, 1989
Inventor
Frederick A. Zenz
Assignee (at issue)
HRI
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.