Inventor
HOKKYO HIROTAKA
JP8 patents
⚠️ This page may combine multiple inventors who share the name “HOKKYO HIROTAKA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
7 patentsUS6426157B1Jul 30, 2002
Perpendicular magnetic recording medium
NEC CORP83 citations97
US6387483B1May 14, 2002
Perpendicular magnetic recording medium and manufacturing process therefor
NEC CORP89 citations97
US6270885B1Aug 7, 2001
Perpendicular magnetic recording medium
NEC CORP96 citations97
US6204995B1Mar 20, 2001
Magnetic disc apparatus
NEC CORP83 citations97
US7212743B2May 1, 2007
Optical switch device, and optical reception device and optical switch network in which the optical switch device is applied
NEC CORP5 citations62
US6462916B1Oct 8, 2002
Magnetic disc apparatus
NEC CORP2 citations61
US6638647B2Oct 28, 2003
Vertical recording medium with thin soft magnetic film
NEC CORP0 citations51