Granted Patent
Utility
US 6,143,468 · App. 08/941,720
Optical information recording medium and optical recording method
Inventors:
Takashi Ohno, Michikazu Horie
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: Oct 1, 1997
Inventors
Takashi Ohno
Michikazu Horie
Assignee (at issue)
MITSUBISHI CHEMICAL CORPORATION
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.