Granted Patent
Utility
US 4,331,556 · App. 05/866,695
Heat storage material
Inventor:
Gustaf O. Arrhenius
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Jan 3, 1978
Inventor
Gustaf O. Arrhenius
Assignee (at issue)
Kay Laboratories, Inc.
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.