Granted Patent
Utility
US 5,116,465 · App. 07/786,688
Removal of water, methanol and acetone from propylene oxide by extractive distillation
Inventors:
Ernest L. Yeakey, Edward T. Marquis
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Nov 1, 1991
Inventors
Ernest L. Yeakey
Edward T. Marquis
Assignee (at issue)
Texaco Chemical Inc.
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.