Granted Patent
Utility
US 5,262,017 · App. 08/047,910
Plural stage purification of propylene oxide
Inventors:
Robert A. Meyer, William A. Smith, Mark A. Mueller, Gregory B. Demoll
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Apr 19, 1993
Inventors
Robert A. Meyer
William A. Smith
Mark A. Mueller
Gregory B. Demoll
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.