IP Library Granted Patent US 4,842,719
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,842,719
App. No.
06/876,307
Filed
1986-06-18
Granted
1989-06-27
Kind
A