Assignee
POWDERTECH CO LTD
JP·75 granted patents·33 pending applications·258 citations·filing 1992–2023
Top patents by PatentIndex Score
108 records- 0191US7566519B2Carrier for electrophotographic developer, and electrophotographic developer using the samePOWDERTECH CO LTD·Filed 2006·Granted Jul 28, 2009·14 cites·7 claims
- 0290US11359689B2Iron oxide powder for brake friction materialPOWDERTECH CO LTD·Filed 2017·Granted Jun 14, 2022·2 cites·5 claims
- 0389US10825593B2Ni—Zn—Cu ferrite particle, resin composition, and resin moldingPOWDERTECH CO LTD·Filed 2017·Granted Nov 3, 2020·3 cites·14 claims
- 0486US9372426B2Ferrite particle having outer shell structure, ferrite carrier core material for electrophotographic developer, and electrophotographic developerPOWDERTECH CO LTD·Filed 2015·Granted Jun 21, 2016·2 cites·8 claims
- 0585US5595850AFerrite carrier for electrophotographic developer and developer containing the carrierPOWDERTECH CO LTD·Filed 1995·Granted Jan 21, 1997·39 cites·14 claims
- 0684US11014826B2Ferrite particles, resin composition and resin filmPOWDERTECH CO LTD·Filed 2017·Granted May 25, 2021·2 cites·5 claims
- 0784US10754271B2Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, and developerPOWDERTECH CO LTD·Filed 2017·Granted Aug 25, 2020·2 cites·6 claims
- 0884US7442483B2Ferrite carrier for electrophotographic developer and method for preparing the same, and electrophotographic developer using the samePOWDERTECH CO LTD·Filed 2005·Granted Oct 28, 2008·9 cites·4 claims
- 0983US10593454B2Spherical ferrite particles in nano-size and method of manufacturing samePOWDERTECH CO LTD·Filed 2015·Granted Mar 17, 2020·2 cites·6 claims
- 1083US7521163B2Resin-coated ferrite carrier for electrophotographic developer, its production method, and electrophotographic developer using the resin-coated ferrite carrierPOWDERTECH CO LTD·Filed 2005·Granted Apr 21, 2009·7 cites·5 claims
- 1181US11572926B2Iron oxide powder for brake friction materialPOWDERTECH CO LTD·Filed 2022·Granted Feb 7, 2023·0 cites·6 claims
- 1281US10564561B2Ferrite carrier core material for electrophotographic developer, ferrite carrier for electrophotographic developer, electrophotographic developer, and method for manufacturing ferrite carrier core material for electrophotographic developerPOWDERTECH CO LTD·Filed 2017·Granted Feb 18, 2020·2 cites·12 claims
- 1380US5466552AFerrite carrier for electrophotographic developer and developer containing the carrierPOWDERTECH CO LTD·Filed 1994·Granted Nov 14, 1995·24 cites·6 claims
- 1478US7921798B2Oxygen detector sheet and oxygen detecting agent using the same, and method for manufacturing oxygen detector sheetPOWDERTECH CO LTD·Filed 2005·Granted Apr 12, 2011·8 cites·4 claims
- 1578US7880483B2Method for inspecting quality of core material for electrophotographic ferrite carrierPOWDERTECH CO LTD·Filed 2008·Granted Feb 1, 2011·5 cites·6 claims
- 1677US6235443B1Carrier for electrophotographic developer and electrophotographic developer containing the samePOWDERTECH CO LTD·Filed 2000·Granted May 22, 2001·16 cites·8 claims
- 1776US5419994ACarrier for electrophotographic developer, process for preparing the same and developer prepared by using said carrierPOWDERTECH CO LTD·Filed 1992·Granted May 30, 1995·21 cites·5 claims
- 1875US11029618B2Carrier, electrophotographic developer and production method of carrierPOWDERTECH CO LTD·Filed 2018·Granted Jun 8, 2021·1 cites·17 claims
- 1973US12386281B2Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developerPOWDERTECH CO LTD·Filed 2020·Granted Aug 12, 2025·0 cites·15 claims
- 2073US12253825B2Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developerPOWDERTECH CO LTD·Filed 2020·Granted Mar 18, 2025·0 cites·10 claims
- 2173US7824833B2Resin-coated ferrite carrier for electrophotographic developer, its production method, and electrophotographic developer using the resin-coated ferrite carrierPOWDERTECH CO LTD·Filed 2006·Granted Nov 2, 2010·4 cites·17 claims
- 2271US12134567B2Ferrite powder and method for producing samePOWDERTECH CO LTD·Filed 2021·Granted Nov 5, 2024·0 cites·8 claims
- 2371US6210850B1Carrier for electrophotographic developer and electrophotographic developer containing the samePOWDERTECH CO LTD·Filed 2000·Granted Apr 3, 2001·12 cites·8 claims
- 2470US11651881B2Mn—Zn ferrite particles, resin molded body, soft magnetic mixed powder, and magnetic corePOWDERTECH CO LTD·Filed 2018·Granted May 16, 2023·0 cites·6 claims
- 2569US12455516B2Ferrite particle, carrier core material for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developerPOWDERTECH CO LTD·Filed 2021·Granted Oct 28, 2025·0 cites·9 claims
- 2669US5976747AFerrite carrier for electrophotographic developer and electrophotographic developer containing the samePOWDERTECH CO LTD·Filed 1998·Granted Nov 2, 1999·19 cites·8 claims
- 2766US7914715B2Granulating method, granulated particle(s) and granulating devicePOWDERTECH CO LTD·Filed 2007·Granted Mar 29, 2011·1 cites·11 claims
- 2866US2024182323A1Ferrite powder, ferrite resin composite material, and electromagnetic shielding material, electronic material, or electronic componentPOWDERTECH CO LTD·Filed 2022·Application pending·0 cites
- 2965US11952286B2Mn ferrite powder, resin composition, electromagnetic wave shielding material, electronic material, and electronic componentPOWDERTECH CO LTD·Filed 2019·Granted Apr 9, 2024·0 cites·8 claims
- 3065US7879522B2Carrier core material for electrophotographic developer, carrier and electrophotographic developer using the carrierPOWDERTECH CO LTD·Filed 2009·Granted Feb 1, 2011·2 cites·19 claims
- 3162US2025218631A1Magnetic compositePOWDERTECH CO LTD·Filed 2023·Application pending·0 cites
- 3261US12436480B2Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developerPOWDERTECH CO LTD·Filed 2021·Granted Oct 7, 2025·0 cites·11 claims
- 3361US11072537B2Ferrite powder, resin composition, and molded articlePOWDERTECH CO LTD·Filed 2017·Granted Jul 27, 2021·0 cites·12 claims
- 3461US10919779B2Iron oxide powder for brake friction materialPOWDERTECH CO LTD·Filed 2017·Granted Feb 16, 2021·0 cites·5 claims
- 3561US7553597B2Carrier core material, coated carrier, and two-component developing agent for electrophotographyPOWDERTECH CO LTD·Filed 2004·Granted Jun 30, 2009·8 cites·18 claims
- 3660US11099495B2Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, developer, method for producing magnetic core material for electrophotographic developer, method for producing carrier for electrophotographic developer, and method for producing developerPOWDERTECH CO LTD·Filed 2018·Granted Aug 24, 2021·0 cites·12 claims
- 3760US10996576B2Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, and developerPOWDERTECH CO LTD·Filed 2017·Granted May 4, 2021·0 cites·5 claims
- 3860US10969706B2Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, and developerPOWDERTECH CO LTD·Filed 2018·Granted Apr 6, 2021·0 cites·12 claims
- 3959US11542174B2Ferrite particles, resin compositions and electromagnetic wave shielding materialPOWDERTECH CO LTD·Filed 2017·Granted Jan 3, 2023·0 cites·5 claims
- 4058US12422763B2Ferrite particles, electrophotographic developer carrier core material, electrophotographic developer carrier, and electrophotographic developerPOWDERTECH CO LTD·Filed 2021·Granted Sep 23, 2025·0 cites·10 claims
- 4158US12119151B2Ferrite powder and method of producing the samePOWDERTECH CO LTD·Filed 2021·Granted Oct 15, 2024·0 cites·10 claims
- 4258US10996579B2Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, and developerPOWDERTECH CO LTD·Filed 2018·Granted May 4, 2021·0 cites·7 claims
- 4358US5518849AFerrite carrier for electrophotographic developer and developer using said carrierPOWDERTECH CO LTD·Filed 1994·Granted May 21, 1996·11 cites·5 claims
- 4458US2024264546A1Ferrite particle, carrier for electrophotographic developer, electrophotographic developer, and method for producing ferrite particlePOWDERTECH CO LTD·Filed 2022·Application pending·0 cites
- 4557US12595188B2Ferrite powder, ferrite resin composite material, and electromagnetic shielding material, electronic material, or electronic componentPOWDERTECH CO LTD·Filed 2020·Granted Apr 7, 2026·0 cites·7 claims
- 4657US9329515B2Resin-coated carrier for electrophotographic developer and electrophotographic developer using the resin-coated carrierPOWDERTECH CO LTD·Filed 2014·Granted May 3, 2016·0 cites·9 claims
- 4757US9201328B2Core material for resin-filled ferrite carrier and ferrite carrier for electrophotographic developer, and electrophotographic developer using the ferrite carrierPOWDERTECH CO LTD·Filed 2014·Granted Dec 1, 2015·0 cites·9 claims
- 4857US7183033B2Carrier core material, coated carrier, two-component developing agent for electrophotography, and image forming methodPOWDERTECH CO LTD·Filed 2004·Granted Feb 27, 2007·6 cites·13 claims
- 4956US10603614B2Ferrite particles having outer shell structure used for filtering mediumPOWDERTECH CO LTD·Filed 2016·Granted Mar 31, 2020·0 cites·9 claims
- 5056US10258970B2Ferrite particles provided with outer shell structure for catalyst supporting mediumPOWDERTECH CO LTD·Filed 2016·Granted Apr 16, 2019·0 cites·19 claims
Showing the top 50 of 108 patent records by PatentIndex Score.
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