Granted Patent
Utility
US 5,529,667 · App. 08/347,622
Process for recovering ethylene oxide
Inventor:
Freylon B. Coffey
Patented Case
View Patent ↗
Granted: Jun 25, 1996
Filed: Dec 1, 1994
Inventor
Freylon B. Coffey
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.