Granted Patent
Utility
US 5,540,894 · App. 08/066,277
Method and apparatus for processing bed material in fluidized bed reactors
Inventor:
Timo Hyppanen
Patented Case
View Patent ↗
Granted: Jul 30, 1996
Filed: May 26, 1993
Inventor
Timo Hyppanen
Assignee (at issue)
A. Ahlstrom Corporation
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.