Granted Patent
Utility
US 4,676,646 · App. 06/787,333
Method and apparatus for controlling thickness of a layer of an optical data storage device by measuring an optical property of the layer
Inventors:
David Strand, John Vala
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Oct 15, 1985
Inventors
David Strand
John Vala
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.