Granted Patent
Utility
US 5,081,325 · App. 07/596,478
Purification of unsaturated hydrocarbon streams containing styrenics
Inventors:
Robert J. Haynal, Stewart H. Presnall, Beverly B. Slimp, Jr.
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Oct 12, 1990
Inventors
Robert J. Haynal
Stewart H. Presnall
Beverly B. Slimp, Jr.
Assignee (at issue)
Lyondell Petrochemical Company
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.