Granted Patent
Utility
US 4,522,033 · App. 06/627,581
Cryogenic refrigerator with gas spring loaded valve
Inventor:
Jack E. Jensen
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Jul 2, 1984
Inventor
Jack E. Jensen
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.