Granted Patent
Utility
US 5,224,350 · App. 07/881,250
Process for recovering helium from a gas stream
Inventor:
Yuv R. Mehra
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: May 11, 1992
Inventor
Yuv R. Mehra
Assignee (at issue)
ADVANCED EXTRACTION TECHNOLOGIES, 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.