Granted Patent
Utility
US 4,766,253 · App. 07/046,594
Process for preparing chlorinated diphenyl ethers
Inventor:
Peter Hans Rauber
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: May 4, 1987
Inventor
Peter Hans Rauber
Assignee (at issue)
Ciba-Geigy
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.