Granted Patent
Utility
US 5,620,568 · App. 08/659,975
Extractive distillation of propylene oxide using propanol
Inventors:
William A. Smith, Mark A. Mueller
Patented Case
View Patent ↗
Granted: Apr 15, 1997
Filed: Jun 3, 1996
Inventors
William A. Smith
Mark A. Mueller
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.