Granted Patent
Utility
US 4,820,394 · App. 06/935,881
Phase changeable material
Inventors:
Rosa Young, Eugenia Mytilineou
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Dec 1, 1986
Inventors
Rosa Young
Eugenia Mytilineou
Assignee (at issue)
Energy Conversion Devices, 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.