Granted Patent
Utility
US 4,846,861 · App. 07/191,095
Cryogenic refrigerator having a regenerator with primary and secondary flow paths
Inventors:
Robert Berry, Samuel G. Siciliano
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: May 6, 1988
Inventors
Robert Berry
Samuel G. Siciliano
Assignee (at issue)
Hughes Aircraft Company
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.