Granted Patent
Utility
US 6,183,892 · App. 09/154,731
Magnetic recording medium substrate and magnetic recording medium
Inventors:
Jun Saiki, Hideo Okada, Yukihiro Miyamoto
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Sep 17, 1998
Inventors
Jun Saiki
Hideo Okada
Yukihiro Miyamoto
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.