Granted Patent
Utility
US 4,667,309 · App. 06/752,742
Erasure means
Inventor:
Michael Hennessey
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Jul 8, 1985
Inventor
Michael Hennessey
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.