Granted Patent
Utility
US 5,958,192 · App. 08/917,985
Purification of propylene oxide using ethylene glycol monomethyl ether as an extractive distillation agent
Inventor:
Peter S. Morford
Patented Case
View Patent ↗
Granted: Sep 28, 1999
Filed: Aug 27, 1997
Inventor
Peter S. Morford
Assignee (at issue)
Huntsman Specialty Chemicals 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.