Inventor
HISHIYAMA SADAO
JP17 patents
⚠️ This page may combine multiple inventors who share the name “HISHIYAMA SADAO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
16 patentsUS5605733AFeb 25, 1997
Magnetic recording medium, method for its production, and system for its use
HITACHI LTD70 citations96
US5147732ASep 15, 1992
Longitudinal magnetic recording media and magnetic memory units
HITACHI LTD96 citations96
US5143794ASep 1, 1992
Magnetic recording media for longitudinal recording, process for producing the same and magnetic memory apparatus
HITACHI LTD49 citations96
US4833020AMay 23, 1989
Magnetic recording medium
HITACHI LTD77 citations96
US5236791AAug 17, 1993
Magnetic recording medium and magnetic storage
HITACHI LTD58 citations95
US6335103B1Jan 1, 2002
Magnetic recording media for longitudinal recording
HITACHI LTD21 citations92
US5665478ASep 9, 1997
Magnetic recording media for longitudinal recording
HITACHI LTD32 citations92
US4883711ANov 28, 1989
Magnetic recording medium
HITACHI LTD30 citations92
US6627253B2Sep 30, 2003
Magnetic recording media for longitudinal recording, process for producing the same and magnetic memory apparatus
HITACHI LTD16 citations84
US4842917AJun 27, 1989
Magnetic recording medium and process for producing the same
HITACHI LTD20 citations82
US4621030ANov 4, 1986
Perpendicular magnetic recording medium and manufacturing method thereof
HITACHI LTD24 citations82
US3947372AMar 30, 1976
Ferrimagnetic material
HITACHI LTD25 citations82
US4544591AOct 1, 1985
Perpendicular magnetic recording medium
HITACHI LTD7 citations74
US4786553ANov 22, 1988
Magnetic recording medium
HITACHI LTD13 citations73
US4792497ADec 20, 1988
Magnetic recording media for longitudinal recording
HITACHI LTD10 citations71
US4939045AJul 3, 1990
Magnetic recording medium
HITACHI LTD5 citations62