Granted Patent
Utility
US 4,793,292 · App. 07/072,597
Circulating fluidized bed reactor
Inventors:
Folke Engstrom, Juhani Isaksson
Patented Case
View Patent ↗
Granted: Dec 27, 1988
Filed: Jul 13, 1987
Inventors
Folke Engstrom
Juhani Isaksson
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.