Granted Patent
Utility
US 4,755,134 · App. 07/052,047
Circulating fluidized bed reactor
Inventors:
Folke Engstrom, Ragnar G. Lundqvist
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: May 8, 1987
Inventors
Folke Engstrom
Ragnar G. Lundqvist
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.