Granted Patent
Utility
US 4,279,130 · App. 06/041,308
Recovery of 1,3-butadiene by fractional crystallization from four-carbon mixtures
Inventors:
Ray N. Finch, William D. Nash
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: May 22, 1979
Inventors
Ray N. Finch
William D. Nash
Assignee (at issue)
El Paso Products 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.