Granted Patent
Utility
US 3,945,215 · App. 05/443,140
Low-loss, fluid helium transfer line suitable for extended lengths
Inventors:
Robert W. Johnson, Paul R. Doherty
Patented Case
View Patent ↗
Granted: Mar 23, 1976
Filed: Feb 14, 1974
Inventors
Robert W. Johnson
Paul R. Doherty
Assignee (at issue)
Cryogenic 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.