Inventor · disambiguated record
Masafumi Sakamoto
Also filed as: SAKAMOTO MASAFUMI
62 granted patents·12 pending applications·1,736 citations·filing 1980–2024
99Inventor score
Top patents by PatentIndex Score
74 records- 0197US5874795AMulti-phase permanent-magnet type electric rotating machineJAPAN SERVO·Filed 1996·Granted Feb 23, 1999·123 cites·5 claims
- 0294US5386161APermanent magnet stepping motorJAPAN SERVO·Filed 1993·Granted Jan 31, 1995·92 cites·9 claims
- 0394US4384226ASmall-sized electric motorJAPAN SERVO·Filed 1981·Granted May 17, 1983·65 cites·9 claims
- 0493US7242118B2Toroidal-coil linear stepping motor, toroidal-coil linear reciprocating motor, cylinder compressor and cylinder pump using these motorsJAPAN SERVO·Filed 2004·Granted Jul 10, 2007·50 cites·9 claims
- 0593US6765321B2Three-phase toroidal coil type permanent magnet electric rotating machineJAPAN SERVO·Filed 2002·Granted Jul 20, 2004·52 cites·12 claims
- 0693US6329729B1Hybrid stepping motorJAPAN SERVO·Filed 2000·Granted Dec 11, 2001·32 cites·7 claims
- 0793US6028377AThree-phase permanent magnet cascade claw type stepping motorJAPAN SERVO·Filed 1998·Granted Feb 22, 2000·56 cites·2 claims
- 0892US6121712AThree-phase permanent magnet cascade claw type stepping motorJAPAN SERVO·Filed 1999·Granted Sep 19, 2000·52 cites·3 claims
- 0991US6477918B2Rotary electric machine having coaxial output hollow shaft with reduction gear and slip ringJAPAN SERVO·Filed 2001·Granted Nov 12, 2002·46 cites·9 claims
- 1091US5532531APermanent magnet type brushless motorJAPAN SERVO·Filed 1994·Granted Jul 2, 1996·77 cites·11 claims
- 1190US6628338B1Direct drive electric motor apparatus incorporating slip ring assemblyELBEX VIDEO LTD·Filed 1998·Granted Sep 30, 2003·146 cites·50 claims
- 1290US5854526AThree-phase permanent-magnet electric rotating machineJAPAN SERVO·Filed 1996·Granted Dec 29, 1998·74 cites·12 claims
- 1389US10775719B2Duct mechanism and image forming apparatus including the sameSHARP KK·Filed 2018·Granted Sep 15, 2020·3 cites·10 claims
- 1489US6670732B2Magnet type stepping motorJAPAN SERVO·Filed 2002·Granted Dec 30, 2003·24 cites·6 claims
- 1589US4503368APermanent magnet type stepping motorJAPAN SERVO·Filed 1983·Granted Mar 5, 1985·49 cites·4 claims
- 1688US5289064AThree-phase permanent magnet stepping motorJAPAN SERVO·Filed 1992·Granted Feb 22, 1994·63 cites·5 claims
- 1787US4983867AHybrid-type stepping motorJAPAN SERVO·Filed 1990·Granted Jan 8, 1991·63 cites·8 claims
- 1884US5410200AHybrid type stepping motorJAPAN SERVO·Filed 1993·Granted Apr 25, 1995·65 cites·5 claims
- 1983US6160330AThree-phase stepping motor and driving method thereforJAPAN SERVO·Filed 1998·Granted Dec 12, 2000·56 cites·10 claims
- 2082US9653658B2Red phosphor and light emitting device including the sameNICHIA CORP·Filed 2015·Granted May 16, 2017·3 cites·10 claims
- 2180US6504272B2Multi-phase electric rotating machine having toroidal coils and using method thereofJAPAN SERVO·Filed 2000·Granted Jan 7, 2003·25 cites·14 claims
- 2280US6460889B2Front portion structure of vehicle frameISUZU MOTORS LTD·Filed 1998·Granted Oct 8, 2002·52 cites·5 claims
- 2380US4347457APermanent magnet type stepping motorJAPAN SERVO·Filed 1980·Granted Aug 31, 1982·35 cites·2 claims
- 2478US11054789B2Image forming apparatus provided with a ductSHARP KK·Filed 2018·Granted Jul 6, 2021·1 cites·8 claims
- 2578US4499391AEnd bracket for motorJAPAN SERVO·Filed 1982·Granted Feb 12, 1985·31 cites·5 claims
- 2677US6172438B1Two-phase permanent-magnet electric rotating machineJAPAN SERVO COMPANY LTD·Filed 1998·Granted Jan 9, 2001·40 cites·4 claims
- 2775US7145278B2Permanent magnet type three-phase stepping motorJAPAN SERVO·Filed 2005·Granted Dec 5, 2006·8 cites·3 claims
- 2875US5708310APermanent magnet type stepping motorJAPAN SERVO·Filed 1996·Granted Jan 13, 1998·47 cites·8 claims
- 2974US7274805B2Method of driving surveillance camera by using rotary electric machineJAPAN SERVO·Filed 2003·Granted Sep 25, 2007·12 cites·6 claims
- 3074US6741006B2Magnet type stepping motorJAPAN SERVO·Filed 2001·Granted May 25, 2004·11 cites·2 claims
- 3174US2025197219A1Silicon-containing aluminum nitride particles, sintered body, resin composition, and method for producing silicon-containing aluminum nitride particlesNICHIA CORP·Filed 2024·Application pending·0 cites
- 3273US5780944ATwo-phase permanent-magnet electric rotating machineJAPAN SERVO·Filed 1996·Granted Jul 14, 1998·33 cites·7 claims
- 3373US5243246AConnector assembly for a rotary electric machineJAPAN SERVO·Filed 1992·Granted Sep 7, 1993·35 cites·5 claims
- 3471US7342330B2Hybrid type double three-phase electric rotating machineJAPAN SERVO·Filed 2005·Granted Mar 11, 2008·7 cites·5 claims
- 3571US6903476B2Permanent magnet type three-phase stepping motorJAPAN SERVO·Filed 2002·Granted Jun 7, 2005·15 cites·6 claims
- 3670US9882442B2Rotating electric machine including rotor arranged with intermediation of air gapNIPPON PISTON RING CO LTD·Filed 2014·Granted Jan 30, 2018·3 cites·6 claims
- 3770US6320347B1Method of driving directly a rotary drum in a reproducing machine by a prime moverJAPAN SERVO·Filed 2000·Granted Nov 20, 2001·11 cites·7 claims
- 3869US5032747AStepping motorJAPAN SERVO·Filed 1990·Granted Jul 16, 1991·31 cites·6 claims
- 3968US8952589B2Rotating electrical machineNIPPON PISTON RING CO LTD·Filed 2012·Granted Feb 10, 2015·2 cites·9 claims
- 4068US7779532B2Manufacturing method of hybrid permanent magnet type electric rotating machineNIDEC SERVO CORP·Filed 2007·Granted Aug 24, 2010·6 cites·8 claims
- 4167US7589440B2Stepping motorNIDEC SERVO CORP·Filed 2006·Granted Sep 15, 2009·5 cites·3 claims
- 4266US6051898AStepping motor having external rotor and electromagnetic-combined-permanent-magnet statorJAPAN SERVO·Filed 1998·Granted Apr 18, 2000·20 cites·2 claims
- 4365US6731027B2Three-phase hybrid type stepping motorJAPAN SERVO·Filed 2002·Granted May 4, 2004·13 cites·6 claims
- 4465US6707178B2Permanent magnet type twelve-pole stepping motorJAPAN SERVO·Filed 2001·Granted Mar 16, 2004·13 cites·10 claims
- 4565US2023285627A1Air purifier and method for controlling the sameSHARP KK·Filed 2023·Application pending·0 cites
- 4664US6359349B1Composite type three phase stepping motorJAPAN SERVO·Filed 2000·Granted Mar 19, 2002·8 cites·12 claims
- 4763US8138641B2Permanent-magnet rotary electric machineSAKAMOTO MASAFUMI·Filed 2009·Granted Mar 20, 2012·5 cites·10 claims
- 4863US6545376B2Three-phase hybrid type stepping motorJAPAN SERVO·Filed 2001·Granted Apr 8, 2003·12 cites·20 claims
- 4961US6731033B2Motor-driven system with stator provided with inductorsJAPAN SERVO·Filed 2001·Granted May 4, 2004·10 cites·34 claims
- 5060US6781260B2Permanent magnet type rotary machineJAPAN SERVO·Filed 2002·Granted Aug 24, 2004·9 cites·11 claims
Showing the top 50 of 74 patent records by PatentIndex Score.
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