Granted Patent
Utility
US 4,720,715 · App. 07/007,610
Optical disc structure having an air sandwich structure
Inventors:
Fujio Omae, Masahiro Yamada
Patented Case
View Patent ↗
Granted: Jan 19, 1988
Filed: Jan 28, 1987
Inventors
Fujio Omae
Masahiro Yamada
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.