Granted Patent
Utility
US 6,537,638 · App. 09/681,056
Magnetic recording disk with perpendicular magnetic recording layer and multilayered underlayer structure
Inventors:
Hoa Van Do, Yoshihiro Ikeda, Yoshiaki Sonobe, Kentaro Takano
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Dec 13, 2000
Inventors
Hoa Van Do
Yoshihiro Ikeda
Yoshiaki Sonobe
Kentaro Takano
Assignee (at issue)
International Business Machines 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.