Granted Patent
Utility
US 5,601,039 · App. 08/331,605
Method and apparatus for providing a gas seal in a return duct and/or controlling the circulating mass flow in a circulating fluidized bed reactor
Inventor:
Timo Hyppanen
Patented Case
View Patent ↗
Granted: Feb 11, 1997
Filed: Nov 4, 1994
Inventor
Timo Hyppanen
Assignee (at issue)
FOSTER WHEELER ENERGIA OY
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.