Granted Patent
Utility
US 4,880,953 · App. 07/289,559
Method of recharging a heat pack by microwave energy
Inventor:
Charles F. Manker
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Dec 23, 1988
Inventor
Charles F. Manker
Assignee (at issue)
PRISM TECHNOLOGIES LLC
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.