Granted Patent
Utility
US 5,559,257 · App. 08/392,469
Process for the preparation of tetrachloro-1,4-benzoquinone
Inventors:
Otto Arndt, Wolfgang Tronich
Patented Case
View Patent ↗
Granted: Sep 24, 1996
Filed: Feb 22, 1995
Inventors
Otto Arndt
Wolfgang Tronich
Assignee (at issue)
Hoechst A.G.
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.