Granted Patent
Utility
US 6,587,425 · App. 10/171,542
Multilevel recording and reproduction method and phase change multilevel recording medium
Inventors:
Takashi Ohno, Michikazu Horie
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Jun 17, 2002
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.