Granted Patent
Utility
US 5,464,505 · App. 08/251,158
Use of propylene oxide adducts in the purification of propylene oxide by extractive distillation
Inventors:
Michael W. Peters, William A. Smith, Mark A. Mueller, William K. Culbreth, III
Patented Case
View Patent ↗
Granted: Nov 7, 1995
Filed: May 31, 1994
Inventors
Michael W. Peters
William A. Smith
Mark A. Mueller
William K. Culbreth, III
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.