Granted Patent
Utility
US 4,802,345 · App. 07/128,233
Non-temperature cycling cryogenic cooler
Inventor:
Daniel L. Curtis
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Dec 3, 1987
Inventor
Daniel L. Curtis
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.