Granted Patent
Utility
US 5,314,609 · App. 07/926,204
Process for preparing debenzolized tar and low-benzene centrifuged tar sludge
Inventors:
John Stipanovich, Jr., David Q. Wible
Patented Case
View Patent ↗
Granted: May 24, 1994
Filed: Aug 7, 1992
Inventors
John Stipanovich, Jr.
David Q. Wible
Assignee (at issue)
Aristech Chemical 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.