Granted Patent
Utility
US 4,277,313 · App. 06/134,687
Recovery of 1,3-butadiene
Inventors:
Yuv R. Mehra, Ralph E. Clark
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Mar 27, 1980
Inventors
Yuv R. Mehra
Ralph E. Clark
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.