Granted Patent
Utility
US 5,171,406 · App. 07/599,322
Fluidized bed selective pyrolysis of coal
Inventors:
Jer-Yu Shang, Chang Y. Cha, Norman W. Merriam
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: Oct 17, 1990
Inventors
Jer-Yu Shang
Chang Y. Cha
Norman W. Merriam
Assignee (at issue)
Western Research Institute, Inc.
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.