Granted Patent
Utility
US 4,468,440 · App. 06/380,578
Air heating and cooling system for aircraft batteries
Inventor:
John M. Evjen
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: May 21, 1982
Inventor
John M. Evjen
Assignee (at issue)
General Electric 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.