Granted Patent
Utility
US 5,440,883 · App. 08/295,277
Pulse-tube refrigerator
Inventor:
Shintaro Harada
Patented Case
View Patent ↗
Granted: Aug 15, 1995
Filed: Aug 24, 1994
Inventor
Shintaro Harada
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.