Granted Patent
Utility
US 4,842,719 · App. 06/876,307
Catalytic two-stage coal hydrogenation and hydroconversion process
Inventors:
James B. MacArthur, Joseph B. McLean, Alfred G. Comolli
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Jun 18, 1986
Inventors
James B. MacArthur
Joseph B. McLean
Alfred G. Comolli
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.