Granted Patent
Utility
US 4,192,661 · App. 05/911,624
Adsorbing impurities from cryogenic fluid make-up prior to admixing with feed
Inventor:
Robert W. Johnson
Patented Case
View Patent ↗
Granted: Mar 11, 1980
Filed: Jun 1, 1978
Inventor
Robert W. Johnson
Assignee (at issue)
Helix Technology 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.