Granted Patent
Utility
US 4,277,938 · App. 06/136,654
Combination rotating fluidized bed combustor and heat exchanger
Inventors:
William H. Belke, George B. Grim
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Oct 15, 1979
Inventors
William H. Belke
George B. Grim
Assignee (at issue)
Caterpillar Tractor Co.
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.