Granted Patent
Utility
US 4,858,442 · App. 07/188,287
Miniature integral stirling cryocooler
Inventor:
Norman B. Stetson
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Apr 29, 1988
Inventor
Norman B. Stetson
Assignee (at issue)
Inframetrics 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.