Granted Patent
Utility
US 4,701,201 · App. 06/911,226
Process to produce cold helium gas for liquefaction
Inventors:
Thomas C. Hanson, Theodore F. Fisher, Joseph Alfred Weber, Ravindra F. Pahade
Patented Case
View Patent ↗
Granted: Oct 20, 1987
Filed: Sep 24, 1986
Inventors
Thomas C. Hanson
Theodore F. Fisher
Joseph Alfred Weber
Ravindra F. Pahade
Assignee (at issue)
Union Carbide Corporation
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.