Granted Patent
Utility
US 4,691,035 · App. 06/851,846
Purification of propylene oxide by treatment with a selected base and inert salt
Inventors:
John R. Sanderson, Edward T. Marquis, William A. Smith, Kenneth P. Keating
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: Apr 14, 1986
Inventors
John R. Sanderson
Edward T. Marquis
William A. Smith
Kenneth P. Keating
Assignee (at issue)
Texaco 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.