Granted Patent
Utility
US 5,266,184 · App. 07/832,425
Process for increasing pitch yield from coal tar
Inventor:
William R. Roder
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Feb 7, 1992
Inventor
William R. Roder
Assignee (at issue)
Reilly Industries, 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.