Granted Patent
Utility
US 4,584,839 · App. 06/627,123
Multi-stage cryogenic refrigerators
Inventors:
Jack E. Jensen, Charles B. Hood, Harold Parish
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Jul 2, 1984
Inventors
Jack E. Jensen
Charles B. Hood
Harold Parish
Assignee (at issue)
CVI Incorporated
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.