Inventor · disambiguated record
Masafumi Ishiyama
Also filed as: ISHIYAMA MASAFUMI
24 granted patents·5 pending applications·1,239 citations·filing 2002–2016
97Inventor score
Files withHOYA CORP9HOYA MAGNETICS SINGAPORE PTE6ISHIYAMA MASAFUMI3SEKISUI CHEMICAL CO LTD3UMEZAWA TEIICHIRO3
Top patents by PatentIndex Score
29 records- 0198US7722968B2Magnetic disk and manufacturing method thereofHOYA MAGNETICS SINGAPORE PTE·Filed 2005·Granted May 25, 2010·73 cites·5 claims
- 0298US7695833B2Solid body surface evaluation method, magnetic disk evaluation method, magnetic disk, and manufacturing method thereofHOYA CORP·Filed 2007·Granted Apr 13, 2010·71 cites·5 claims
- 0398US7597973B2Magnetic disk and method of producing the sameHOYA CORP·Filed 2006·Granted Oct 6, 2009·69 cites·5 claims
- 0498US7208236B2Magnetic recording medium with multi-portion carbon-based protection layer, and apparatus thereofHOYA MAGNETICS SINGAPORE PTE·Filed 2005·Granted Apr 24, 2007·75 cites·9 claims
- 0598US7174775B2Solid body surface evaluation method, magnetic disk evaluation method, magnetic disk, and manufacturing method thereofHOYA MAGNETICS SINGAPORE PTE·Filed 2005·Granted Feb 13, 2007·75 cites·6 claims
- 0697US8623528B2Method of manufacturing perpendicular magnetic recording medium and perpendicular magnetic recording mediumUMEZAWA TEIICHIRO·Filed 2009·Granted Jan 7, 2014·73 cites·2 claims
- 0797US8309239B2Perpendicular magnetic recording medium and method of manufacturing the sameUMEZAWA TEIICHIRO·Filed 2008·Granted Nov 13, 2012·69 cites·7 claims
- 0897US8142916B2Magnetic recording mediumUMEZAWA TEIICHIRO·Filed 2008·Granted Mar 27, 2012·72 cites·11 claims
- 0997US8092931B2Magnetic disk, method of manufacturing the magnetic disk and method of evaluating the magnetic diskISHIYAMA MASAFUMI·Filed 2008·Granted Jan 10, 2012·70 cites·6 claims
- 1097US7736768B2Magnetic disk and manufacturing method thereofHOYA CORP·Filed 2005·Granted Jun 15, 2010·69 cites·4 claims
- 1196US8795857B2Perpendicular magnetic recording medium and manufacturing method of the sameAYAMA KENJI·Filed 2008·Granted Aug 5, 2014·51 cites·5 claims
- 1296US8425975B2Magnetic disk and magnetic disk manufacturing methodISHIYAMA MASAFUMI·Filed 2008·Granted Apr 23, 2013·70 cites·6 claims
- 1396US8057926B2Perpendicular magnetic recording mediumAYAMA KENJI·Filed 2008·Granted Nov 15, 2011·70 cites·5 claims
- 1496US7537846B2Magnetic disk, method of manufacturing the magnetic disk and method of evaluating the magnetic diskHOYA CORP·Filed 2004·Granted May 26, 2009·74 cites·1 claims
- 1596US7166319B2Magnetic disk and method of producing the sameHOYA MAGNETICS SINGAPORE PTE·Filed 2004·Granted Jan 23, 2007·72 cites·10 claims
- 1696US7105241B2Magnetic disk and method of manufacturing sameHOYA MAGNETICS SINGAPORE PTE·Filed 2004·Granted Sep 12, 2006·73 cites·11 claims
- 1796US6946191B2Magnetic recording mediumHOYA MAGNETICS SINGAPORE PTE·Filed 2003·Granted Sep 20, 2005·73 cites·11 claims
- 1892US7452440B1Method and device for producing laminated compositeSEKISUI CHEMICAL CO LTD·Filed 2006·Granted Nov 18, 2008·16 cites·5 claims
- 1985US7063768B2Method and device for producing laminated compositeSEKISUI CHEMICAL CO LTD·Filed 2002·Granted Jun 20, 2006·21 cites·8 claims
- 2076US9159351B2Perpendicular magnetic recording medium and method of manufacturing the sameSAKAMOTO KAZUAKI·Filed 2008·Granted Oct 13, 2015·3 cites·11 claims
- 2158US9470971B2Mask blank, transfer mask, and methods of manufacturing the sameHOYA CORP·Filed 2013·Granted Oct 18, 2016·0 cites·7 claims
- 2258US2005224174A1Method and device for producing laminated compositeSEKISUI CHEMICAL CO LTD·Filed 2005·Application pending·0 cites
- 2357US9946153B2Mask blank and transfer maskHOYA CORP·Filed 2016·Granted Apr 17, 2018·0 cites·7 claims
- 2454US8871368B2Perpendicular magnetic recording medium and process for manufacture thereofONOUE TAKAHIRO·Filed 2009·Granted Oct 28, 2014·0 cites·13 claims
- 2550US2011244119A1Perpendicular magnetic recording medium and method of manufacturing the sameWD MEDIA SINGAPORE PTE LTD·Filed 2011·Application pending·0 cites
- 2650US2009169922A1Magnetic disk manufacturing method and magnetic diskHOYA CORP·Filed 2007·Application pending·0 cites
- 2748US8709532B2Magnetic disk and manufacturing method thereofISHIYAMA MASAFUMI·Filed 2010·Granted Apr 29, 2014·0 cites·11 claims
- 2841US2004157006A1Method of producing a magnetic diskHOYA CORP·Filed 2004·Application pending·0 cites
- 2936US2010215992A1Single-sided perpendicular magnetic recording mediumHOYA CORP·Filed 2010·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Masafumi Ishiyama files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →