Inventor · disambiguated record
Hirotaka Yokoyama
Also filed as: YOKOYAMA HIROTAKA
8 granted patents·93 citations·filing 1982–1994
86Inventor score
Top patents by PatentIndex Score
8 records- 0184US4425401AMagnetic recording mediaTOKYO SHIBAURA ELECTRIC CO·Filed 1982·Granted Jan 10, 1984·28 cites·5 claims
- 0275US4636433AMagnetic powders for magnetic recording media and magnetic recording media employing said magnetic powder thereinTOSHIBA KK·Filed 1985·Granted Jan 13, 1987·31 cites·12 claims
- 0365US4447467AMethod and apparatus for perpendicular magnetic recording mediumTOKYO SHIBAURA ELECTRIC CO·Filed 1983·Granted May 8, 1984·13 cites·12 claims
- 0437US4699771AMagnetic recording powder, method of manufacturing thereof and application thereofTOSHIBA KK·Filed 1985·Granted Oct 13, 1987·5 cites·7 claims
- 0535US5494732AMagnetic recording medium and a method for producing the same wherein the medium has two magnetic layers differing in degree of orientationTOSHIBA KK·Filed 1994·Granted Feb 27, 1996·5 cites·10 claims
- 0635US5384182AMagnetic recording medium and a method for producing the same wherein the medium has two magnetic layers differing in degree of orientationTOSHIBA KK·Filed 1991·Granted Jan 24, 1995·5 cites·21 claims
- 0735US5077146AMagnetic 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 KK·Filed 1988·Granted Dec 31, 1991·5 cites·4 claims
- 0829US4837092AMagnetic recording powder, method of manufacturing thereof and application thereofTOSHIBA KK·Filed 1987·Granted Jun 6, 1989·1 cites·12 claims
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