Granted Patent
Utility
US 4,400,263 · App. 06/232,789
H-Coal process and plant design
Inventors:
Paul H. Kydd, Michael C. Chervenak, George DEVAUX
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Feb 9, 1981
Inventors
Paul H. Kydd
Michael C. Chervenak
George DEVAUX
Assignee (at issue)
HRI
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.