Inventor · disambiguated record
Masaaki Tokunaga
Also filed as: HAGI CHITOSHI · TOKUNAGA MASAAKI
52 granted patents·5 pending applications·482 citations·filing 1974–2023
98Inventor score
Files withHITACHI METALS LTD21FUJI XEROX CO LTD11PANASONIC IP MAN CO LTD7HORII KIYOHITO3TOKUNAGA MASAAKI3
Top patents by PatentIndex Score
57 records- 0192US6571073B1Subunit attaching structure and subunit attaching/removing method in image forming apparatusFUJI XEROX CO LTD·Filed 2001·Granted May 27, 2003·41 cites·12 claims
- 0290US8693925B2Powder container and image forming apparatus for causing restraining portion to contact restrained portionHORII KIYOHITO·Filed 2011·Granted Apr 8, 2014·12 cites·12 claims
- 0390US4983232AAnisotropic magnetic powder and magnet thereof and method of producing sameHITACHI METALS LTD·Filed 1987·Granted Jan 8, 1991·37 cites·42 claims
- 0483US4284440ARare earth metal-cobalt permanent magnet alloyHITACHI METALS LTD·Filed 1977·Granted Aug 18, 1981·26 cites·10 claims
- 0582US8774674B2Image forming apparatus and transport guiding device having a smoothly operating doorTOKUNAGA MASAAKI·Filed 2012·Granted Jul 8, 2014·4 cites·8 claims
- 0680US8655224B2Image forming apparatusYOSHINO NAOTO·Filed 2010·Granted Feb 18, 2014·4 cites·11 claims
- 0779US4814139APermanent magnet having good thermal stability and method for manufacturing sameHITACHI METALS LTD·Filed 1987·Granted Mar 21, 1989·25 cites·2 claims
- 0878US5472525ANd-Fe-B system permanent magnetHITACHI METALS LTD·Filed 1994·Granted Dec 5, 1995·27 cites·15 claims
- 0978US4888068AProcess for manufacturing permanent magnetHITACHI METALS LTD·Filed 1985·Granted Dec 19, 1989·26 cites·3 claims
- 1076US8467704B2Image forming apparatus having an image transfer unit movably attached to an opening and closing memberSATO KOICHI·Filed 2010·Granted Jun 18, 2013·2 cites·16 claims
- 1176US7844199B2Image forming apparatus having detachable intermediate transfer bodyFUJI XEROX CO LTD·Filed 2008·Granted Nov 30, 2010·5 cites·8 claims
- 1276US5041172APermanent magnet having good thermal stability and method for manufacturing sameHITACHI METALS LTD·Filed 1990·Granted Aug 20, 1991·25 cites·3 claims
- 1375US8897668B2Cleaning device and image forming apparatus including the sameKANEKO ATSUSHI·Filed 2012·Granted Nov 25, 2014·2 cites·8 claims
- 1475US8503903B2Developer collecting device and image forming apparatusYAMADA MASATOSHI·Filed 2011·Granted Aug 6, 2013·3 cites·4 claims
- 1575US4837109AMethod of producing neodymium-iron-boron permanent magnetHITACHI METALS LTD·Filed 1987·Granted Jun 6, 1989·22 cites·12 claims
- 1674US8630562B2Image forming apparatusTOKUNAGA MASAAKI·Filed 2011·Granted Jan 14, 2014·2 cites·20 claims
- 1771US8626036B2Powder container and image forming apparatus having an opening/closing memberHORII KIYOHITO·Filed 2011·Granted Jan 7, 2014·2 cites·12 claims
- 1870US5230751APermanent magnet with good thermal stabilityHITACHI METALS LTD·Filed 1991·Granted Jul 27, 1993·22 cites·6 claims
- 1968US5758252AImage forming apparatus with improved transportation of curled sheetsFUJI XEROX CO LTD·Filed 1996·Granted May 26, 1998·19 cites·6 claims
- 2068US5223047APermanent magnet with good thermal stabilityHITACHI METALS LTD·Filed 1991·Granted Jun 29, 1993·21 cites·11 claims
- 2167US8634755B2Cleaning unit, image carrier unit, and image forming apparatusICHIKAWA TOMOYA·Filed 2011·Granted Jan 21, 2014·1 cites·7 claims
- 2266US3997371APermanent magnetHITACHI METALS LTD·Filed 1974·Granted Dec 14, 1976·10 cites·18 claims
- 2366US2025179593A1Blast furnace operation methodNIPPON STEEL CORP·Filed 2023·Application pending·0 cites
- 2462US4172717APermanent magnet alloyHITACHI METALS LTD·Filed 1978·Granted Oct 30, 1979·12 cites·5 claims
- 2561US5809391AImage forming apparatus enabling easy and reliable recovery from a pop jamFUJI XEROX CO LTD·Filed 1996·Granted Sep 15, 1998·14 cites·3 claims
- 2660US4978398AMagnetically anisotropic hot-worked magnet and method of producing sameHITACHI METALS LTD·Filed 1989·Granted Dec 18, 1990·11 cites·9 claims
- 2759US2015183209A1Paste supply apparatus, screen printing machine and paste supply methodPANASONIC IP MAN CO LTD·Filed 2014·Application pending·0 cites
- 2858USRE38042EAnisotropic magnetic powder and magnet thereof and method of producing sameHITACHI METALS LTD·Filed 2001·Granted Mar 25, 2003·6 cites·42 claims
- 2958US5617197AImage forming apparatus having a device for stripping a transfer member carried on a transfer drumFUJI XEROX CO LTD·Filed 1995·Granted Apr 1, 1997·13 cites·13 claims
- 3058US5096509AAnisotropic magnetic powder and magnet thereof and method of producing sameHITACHI METALS LTD·Filed 1988·Granted Mar 17, 1992·9 cites·3 claims
- 3155US5822665AImage forming apparatus having means for preventing vibration of a transfer film caused from the operation of a separating deviceFUJI XEROX CO LTD·Filed 1997·Granted Oct 13, 1998·11 cites·11 claims
- 3253US5125990AMagnetically anisotropic hot-worked magnet and method of producing sameHITACHI METALS LTD·Filed 1990·Granted Jun 30, 1992·10 cites·8 claims
- 3352US5594536AReliable transfer film attachment structureFUJI XEROX CO LTD·Filed 1995·Granted Jan 14, 1997·10 cites·9 claims
- 3451US9566779B2Paste supply apparatus, screen printing apparatus, paste supply method and screen printing methodPANASONIC IP MAN CO LTD·Filed 2015·Granted Feb 14, 2017·0 cites·12 claims
- 3550US8862019B2Cleaning device and image forming apparatus including the sameKOMIYAMA TSUTOMU·Filed 2012·Granted Oct 14, 2014·0 cites·7 claims
- 3650USRE38021EAnisotropic magnetic powder and magnet thereof and method of producing sameHITACHI METALS LTD·Filed 2001·Granted Mar 11, 2003·2 cites·3 claims
- 3749US5737681AImage forming apparatus having curling device for holding transfer material and method of curling sheetFUJI XEROX CO LTD·Filed 1996·Granted Apr 7, 1998·9 cites·17 claims
- 3848US8306455B2Transfer device and image forming apparatusTOKUNAGA MASAAKI·Filed 2010·Granted Nov 6, 2012·0 cites·18 claims
- 3947US2016030970A1Paste application devicePANASONIC IP MAN CO LTD·Filed 2014·Application pending·0 cites
- 4046US9393775B2Screen printing machine and screen printing methodPANASONIC IP MAN CO LTD·Filed 2015·Granted Jul 19, 2016·0 cites·3 claims
- 4145US8229322B2Image forming apparatus and apparatus exterior unitSATO KOICHI·Filed 2010·Granted Jul 24, 2012·0 cites·10 claims
- 4245US5659863AImaging forming apparatus with detecting capabilities of a condition of a transfer material carrierFUJI XEROX CO LTD·Filed 1995·Granted Aug 19, 1997·7 cites·16 claims
- 4344US5026419AMagnetically anisotropic hotworked magnet and method of producing sameHITACHI METALS LTD·Filed 1990·Granted Jun 25, 1991·8 cites·10 claims
- 4443US5162063AMagnetically anisotropic r-t-b magnetHITACHI METALS LTD·Filed 1990·Granted Nov 10, 1992·8 cites·5 claims
- 4541US9764543B2Paste supply apparatus and screen printing machinePANASONIC IP MAN CO LTD·Filed 2015·Granted Sep 19, 2017·0 cites·6 claims
- 4641US9352548B2Paste supply apparatus and screen printing machinePANASONIC IP MAN CO LTD·Filed 2015·Granted May 31, 2016·0 cites·4 claims
- 4738US8750747B2Developer collecting device and image forming apparatusYAGATA KAZUYUKI·Filed 2011·Granted Jun 10, 2014·0 cites·10 claims
- 4838US8285169B2Feeding apparatus and image forming apparatusSHIRAI MASAKAZU·Filed 2010·Granted Oct 9, 2012·0 cites·11 claims
- 4938US2015258776A1Screen printing machine and screen printing methodPANASONIC IP MAN CO LTD·Filed 2015·Application pending·0 cites
- 5038US2009123196A1Image forming apparatusFUJI XEROX CO LTD·Filed 2008·Application pending·0 cites
Showing the top 50 of 57 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →