Granted Patent
Utility
US 4,292,189 · App. 06/061,590
Thermal energy storage composition comprising sodium sulfate decahydrate; sodium carbonate decahydrate; and sodium tetraborate decahydrate
Inventor:
Johnson Chen
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Jul 30, 1979
Inventor
Johnson Chen
Assignee (at issue)
Pennwalt Corporation
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.