Granted Patent
Utility
US 5,874,642 · App. 08/879,728
Bis ethers containing a 2,2'-biaryl radical and a process for their preparation
Inventors:
Dieter Regnat, Hans-Jerg Kleiner, Helmut Bahrmann
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Jun 20, 1997
Inventors
Dieter Regnat
Hans-Jerg Kleiner
Helmut Bahrmann
Assignee (at issue)
Hoechst GmbH
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.