Granted Patent
Utility
US 4,541,916 · App. 06/662,357
Coal liquefaction process using low grade crude oil
Inventors:
Harold Beuther, Thaddeus P. Kobylinski, Win-Chung Lee, Bruce K. Schmid
Patented Case
View Patent ↗
Granted: Sep 17, 1985
Filed: Oct 18, 1984
Inventors
Harold Beuther
Thaddeus P. Kobylinski
Win-Chung Lee
Bruce K. Schmid
Assignee (at issue)
Gulf Research & Development Company
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.