IP Library Granted Patent US 4,404,084
Granted Patent Utility
US 4,404,084 · App. 06/357,230

Coal hydrogenation and deashing in ebullated bed catalytic reactor

Inventors: Derk T. A. Huibers, Edwin S. Johanson
Patented Case View Patent ↗
Granted: Sep 13, 1983 Filed: Mar 11, 1982
Inventors
Derk T. A. Huibers
Edwin S. Johanson
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 4,404,084
App. No.
06/357,230
Filed
1982-03-11
Granted
1983-09-13
Kind
A