Granted Patent
Utility
US 4,429,170 · App. 06/398,068
Process for removing tar bases from Lurgi tar acid stream
Inventor:
Robert Lovell
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Jul 14, 1982
Inventor
Robert Lovell
Assignee (at issue)
KOPPERS, INC.
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.