Inventor
YOKOYAMA HIROTAKA
JP8 patents
⚠️ This page may combine multiple inventors who share the name “YOKOYAMA HIROTAKA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TOSHIBA KK
6 patentsUS4636433AJan 13, 1987
Magnetic powders for magnetic recording media and magnetic recording media employing said magnetic powder therein
TOSHIBA KK31 citations91
US4699771AOct 13, 1987
Magnetic recording powder, method of manufacturing thereof and application thereof
TOSHIBA KK5 citations72
US5494732AFeb 27, 1996
Magnetic recording medium and a method for producing the same wherein the medium has two magnetic layers differing in degree of orientation
TOSHIBA KK5 citations62
US5384182AJan 24, 1995
Magnetic recording medium and a method for producing the same wherein the medium has two magnetic layers differing in degree of orientation
TOSHIBA KK5 citations62
US5077146ADec 31, 1991
Magnetic recording medium containing a substituted hexagonal ferrite magnetic powder which includes Zr or Hf and which has a temperature coefficient of coercivity not more than 3.5 oersteds/°C.
TOSHIBA KK5 citations61
US4837092AJun 6, 1989
Magnetic recording powder, method of manufacturing thereof and application thereof
TOSHIBA KK1 citations50