Granted Patent
Utility
US 5,395,914 · App. 08/067,709
Polyarylene ethers containing xanthone units, a process for their preparation, and their use
Inventors:
Peter Wilharm, Thomas Weller, Michael Meier
Patented Case
View Patent ↗
Granted: Mar 7, 1995
Filed: May 26, 1993
Inventors
Peter Wilharm
Thomas Weller
Michael Meier
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.