Granted Patent
Utility
US 4,813,380 · App. 07/129,394
Method and apparatus for controlling the operation of a fluidized bed reactor apparatus
Inventor:
Folke Engstrom
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Nov 24, 1987
Inventor
Folke Engstrom
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.