Granted Patent
Utility
US 4,974,667 · App. 07/419,419
Thermal actuated switchable heat pipe
Inventors:
Tsu-Hung Sun, Mark Hanes
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Oct 10, 1989
Inventors
Tsu-Hung Sun
Mark Hanes
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.