Granted Patent
Utility
US 4,746,476 · App. 06/917,998
Ultrathin polyphenylene oxide polymer films and their preparation
Inventor:
Rachel S. Kohn
Patented Case
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Granted: May 24, 1988
Filed: Oct 10, 1986
Inventor
Rachel S. Kohn
Assignee (at issue)
Hoechst Celanese Corporation
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.