Granted Patent
Utility
US 5,354,430 · App. 08/140,995
Staged purification of contaminated propylene oxide
Inventors:
William K. Culbreth, III, Yu-Hwa E. Sheu, David G. Pottratz
Patented Case
View Patent ↗
Granted: Oct 11, 1994
Filed: Oct 26, 1993
Inventors
William K. Culbreth, III
Yu-Hwa E. Sheu
David G. Pottratz
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.