Granted Patent
Utility
US 4,956,976 · App. 07/469,186
Magnetic refrigeration apparatus for He II production
Inventors:
Stephen F. Kral, John A. Barclay, Peter J. Claybaker, Steven R. Jaeger
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Jan 24, 1990
Inventors
Stephen F. Kral
John A. Barclay
Peter J. Claybaker
Steven R. Jaeger
Assignee (at issue)
Astronautics Corporation of America
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.