Inventor · disambiguated record
Akemi Hirotsune
Also filed as: HIROTSUNE AKEMI
70 granted patents·19 pending applications·955 citations·filing 1994–2014
99Inventor score
Top patents by PatentIndex Score
89 records- 0198US6236635B1Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 1998·Granted May 22, 2001·93 cites·3 claims
- 0297US7012871B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2004·Granted Mar 14, 2006·40 cites·2 claims
- 0395US6532034B2Optical disk, optical disk apparatus, and method for writing figuresHITACHI LTD·Filed 2001·Granted Mar 11, 2003·63 cites·4 claims
- 0495US5709978ASupperresolution readout thin film and information recording mediumHITACHI LTD·Filed 1994·Granted Jan 20, 1998·79 cites·21 claims
- 0594US6529467B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2001·Granted Mar 4, 2003·25 cites·5 claims
- 0694US6343056B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2001·Granted Jan 29, 2002·23 cites·8 claims
- 0791US6856589B2Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing informationHITACHI LTD·Filed 2001·Granted Feb 15, 2005·20 cites·5 claims
- 0891US6231945B1Information recording mediumHITACHI LTD·Filed 1998·Granted May 15, 2001·50 cites·27 claims
- 0991US5912104AInformation recording mediumHITACHI LTD·Filed 1997·Granted Jun 15, 1999·59 cites·9 claims
- 1089US5958649AInformation recording medium and information memory apparatusHITACHI LTD·Filed 1996·Granted Sep 28, 1999·50 cites·37 claims
- 1189US5703867AOptical recording medium having a dummy area at leading and/or trailing positions of recording areaHITACHI LTD·Filed 1996·Granted Dec 30, 1997·29 cites·13 claims
- 1285US6340555B1Information recording medium and information recording and reproducing apparatus using the sameHITACHI LTD·Filed 2000·Granted Jan 22, 2002·17 cites·24 claims
- 1385US5882759AInformation recording medium and information memory storageHITACHI LTD·Filed 1997·Granted Mar 16, 1999·45 cites·17 claims
- 1484US7907490B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2008·Granted Mar 15, 2011·2 cites·1 claims
- 1584US6723411B2Information recording medium and method for manufacturing an information recording mediumHITACHI LTD·Filed 2002·Granted Apr 20, 2004·17 cites·12 claims
- 1684US6636477B1Information recording medium and information recording deviceHITACHI LTD·Filed 1999·Granted Oct 21, 2003·37 cites·18 claims
- 1784US6411591B1Optical recording medium and optical memory deviceHITACHI LTD·Filed 1998·Granted Jun 25, 2002·42 cites·12 claims
- 1884US6317408B1Optical storage medium having information of dummy data at leading side or trailing side of user dataHITACHI LTD·Filed 2000·Granted Nov 13, 2001·8 cites·7 claims
- 1983US6608806B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2002·Granted Aug 19, 2003·8 cites·3 claims
- 2081US7349321B2Information reproduction apparatus and information reproduction methodHITACHI LTD·Filed 2004·Granted Mar 25, 2008·15 cites·20 claims
- 2179US7072283B2Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing informationHITACHI LTD·Filed 2004·Granted Jul 4, 2006·8 cites·17 claims
- 2279US6383595B1Information recording mediumHITACHI LTD·Filed 1999·Granted May 7, 2002·33 cites·24 claims
- 2378US6703098B2Information recording medium and method for manufacturing information recording mediumHITACHI LTD·Filed 2002·Granted Mar 9, 2004·20 cites·4 claims
- 2477US6954941B2Information recording medium and information recording deviceHITACHI MAXELL·Filed 2003·Granted Oct 11, 2005·9 cites·5 claims
- 2577US6854126B2Information recording medium with SiO2-In2O3-SnO2-ZnS protective layerHITACHI LTD·Filed 2003·Granted Feb 8, 2005·11 cites·8 claims
- 2676US8592060B2Perpendicular magnetic recording media having low medium noise and systems using the sameTAMAI ICHIRO·Filed 2010·Granted Nov 26, 2013·4 cites·23 claims
- 2775US5878021AInformation recording medium, information recording method and information recording apparatusHITACHI LT·Filed 1997·Granted Mar 2, 1999·14 cites·22 claims
- 2873US7584150B2Recording method, recording medium, and recording systemHITACHI LTD·Filed 2002·Granted Sep 1, 2009·8 cites·16 claims
- 2972US9117477B2Perpendicular magnetic recording media having novel seed layerHGST Netherlands BV·Filed 2013·Granted Aug 25, 2015·2 cites·19 claims
- 3071US6312779B1Information recording medium and information recording/reproducing apparatusHITACHI LTD·Filed 1999·Granted Nov 6, 2001·40 cites·12 claims
- 3171US6132932AInformation recording medium and information recording and reproducing apparatus using the sameHITACHI LTD·Filed 1997·Granted Oct 17, 2000·18 cites·5 claims
- 3271US5846625AOptical recording medium and information processing apparatus used thereforHITACHI LTD·Filed 1995·Granted Dec 8, 1998·23 cites·53 claims
- 3370US7821884B2Information recording and retrieval method, and its apparatusHITACHI LTD·Filed 2007·Granted Oct 26, 2010·1 cites·20 claims
- 3468US7911910B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2008·Granted Mar 22, 2011·0 cites·1 claims
- 3568US7907491B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2008·Granted Mar 15, 2011·0 cites·1 claims
- 3667US7911930B2Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing informationHITACHI LTD·Filed 2009·Granted Mar 22, 2011·0 cites·5 claims
- 3767US7852727B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2008·Granted Dec 14, 2010·0 cites·2 claims
- 3867US7684301B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2008·Granted Mar 23, 2010·0 cites·3 claims
- 3967US6956806B2Information recording medium, information recording method and information recording apparatusHITACHI MAXELL·Filed 2003·Granted Oct 18, 2005·2 cites·1 claims
- 4066US6650608B2Information recording medium, information recording method and information recording apparatusHITACHI LTD·Filed 2002·Granted Nov 18, 2003·2 cites·2 claims
- 4166US6519219B2Information recording method for recording a recording signal and a dummy signal added to a leading or/and trailing side of the recording signalHITACHI LTD·Filed 2002·Granted Feb 11, 2003·2 cites·6 claims
- 4266US6487156B2Information recording apparatus for recording a recording signal and a dummy signal added to a leading and/or trailing side of the recording signalHITACHI LTD·Filed 2002·Granted Nov 26, 2002·2 cites·4 claims
- 4366US6483794B2Information recording method for recording a recording signal and a dummy signal added to a leading or/and trailing side of the recording signalHITACHI LTD·Filed 2002·Granted Nov 19, 2002·2 cites·6 claims
- 4466US6480452B2Information recording medium, information recording method and information recording apparatusHITACHI LTD·Filed 2002·Granted Nov 12, 2002·2 cites·6 claims
- 4566US6436504B2Information recording mediumHITACHI LTD·Filed 2001·Granted Aug 20, 2002·8 cites·20 claims
- 4664US7570575B2Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing informationHITACHI LTD·Filed 2008·Granted Aug 4, 2009·0 cites·4 claims
- 4762US2009285071A1Recording method, recording medium, and recording systemHITACHI LTD·Filed 2009·Application pending·0 cites
- 4861US7417933B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2005·Granted Aug 26, 2008·0 cites·2 claims
- 4961US7068587B2Method for reproducing information data from a recording medium having dummy data shifted at randomHITACHI MAXELL·Filed 2005·Granted Jun 27, 2006·0 cites·1 claims
- 5061US7042823B2Information recording method and apparatus with suppressed mark edge jittersHITACHI LTD·Filed 2005·Granted May 9, 2006·0 cites·3 claims
Showing the top 50 of 89 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Akemi Hirotsune 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 →