Inventor

Masafumi Sakamoto

Inventor

Kiryu, JP

Overview

1982–2021

Patent span

Electricity

Primary field (CPC H)

Patents· 61 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H02Kprimary

H02KDynamo-electric machines55%

Y10TTechnical subjects covered by former us classification8%

G03GElectrography5%

C09KMaterials for miscellaneous applications, not provided for elsewhere3%

H02PControl or regulation of electric motors, electric generators or dynamo-electric converters3%

G06FElectric digital data processing2%

H01LSemiconductor devices2%

H10HInorganic light-emitting semiconductor devices having potential barriers2%

H10WGeneric packages, interconnections, connectors or other constructional details of devices covered by class h102%

B25JManipulators1%

PatentTitleYear

11,086,160Light control device2021 10,877,435Exhaust device having a plurality of intake ports and image forming apparatus including the same2020 10,866,148Detection device and image forming apparatus2020 10,775,719Duct mechanism and image forming apparatus including the same2020 10,359,733Support member connection mechanism and electrical apparatus including the same2019 10,199,547Red phosphor and light emitting device including the same2019 10,106,735Red phosphor2018 9,882,442'Rotating electric machine including rotor arranged with intermediation of air gap'2018 9,653,658'Red phosphor and light emitting device including the same'2017 8,952,589'Rotating electrical machine'2015 8,138,641'Permanent-magnet rotary electric machine'2012 7,939,976'Hybrid type rotary electric machine'2011 7,779,532'Manufacturing method of hybrid permanent magnet type electric rotating machine'2010 7,589,440'Stepping motor'2009 7,342,330'Hybrid type double three-phase electric rotating machine'2008 7,274,805'Method of driving surveillance camera by using rotary electric machine'2007 7,242,118'Toroidal-coil linear stepping motor, toroidal-coil linear reciprocating motor, cylinder compressor and cylinder pump using these motors'2007 7,145,278'Permanent magnet type three-phase stepping motor'2006 6,903,476'Permanent magnet type three-phase stepping motor'2005 6,781,260'Permanent magnet type rotary machine'2004 6,781,337'Multi-joint type industrial robot'2004 6,765,321'Three-phase toroidal coil type permanent magnet electric rotating machine'2004 6,741,006'Magnet type stepping motor'2004 6,731,027'Three-phase hybrid type stepping motor'2004 6,731,033'Motor-driven system with stator provided with inductors'2004 6,707,178'Permanent magnet type twelve-pole stepping motor'2004 6,670,732'Magnet type stepping motor'2003 RE038346'Three-phase permanent magnet cascade claw type stepping motor'2003 6,633,105'Permanent magnet motor'2003 6,628,338'Direct drive electric motor apparatus incorporating slip ring assembly'2003 6,548,923'Two-phase hybrid type stepping motor'2003 6,545,376'Three-phase hybrid type stepping motor'2003 6,504,272'Multi-phase electric rotating machine having toroidal coils and using method thereof'2003 6,477,918'Rotary electric machine having coaxial output hollow shaft with reduction gear and slip ring'2002 6,460,889'Front portion structure of vehicle frame'2002 6,359,349'Composite type three phase stepping motor'2002 6,329,729'Hybrid stepping motor'2001 6,320,347'Method of driving directly a rotary drum in a reproducing machine by a prime mover'2001 6,281,615'Stepping motor'2001 6,225,773'Stepping motor and having external rotor and electromagnetic-combined-permanent magnet stator'2001 6,172,438'Two-phase permanent-magnet electric rotating machine'2001 6,160,330'Three-phase stepping motor and driving method therefor'2000 6,121,712'Three-phase permanent magnet cascade claw type stepping motor'2000 6,051,898'Stepping motor having external rotor and electromagnetic-combined-permanent-magnet stator'2000 6,028,377'Three-phase permanent magnet cascade claw type stepping motor'2000 5,874,795'Multi-phase permanent-magnet type electric rotating machine'1999 5,854,526'Three-phase permanent-magnet electric rotating machine'1998 5,780,944'Two-phase permanent-magnet electric rotating machine'1998 5,708,310'Permanent magnet type stepping motor'1998 5,532,531'Permanent magnet type brushless motor'1996 5,428,801'Data array conversion control system for controlling conversion of data arrays being transferred between two processing systems'1995 5,410,200'Hybrid type stepping motor'1995 5,386,161'Permanent magnet stepping motor'1995 5,289,064'Three-phase permanent magnet stepping motor'1994 5,243,246'Connector assembly for a rotary electric machine'1993 5,032,747'Stepping motor'1991 4,983,867'Hybrid-type stepping motor'1991 4,503,368'Permanent magnet type stepping motor'1985 4,499,391'End bracket for motor'1985 4,384,226'Small-sized electric motor'1983 4,347,457'Permanent magnet type stepping motor'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982–2008Patents assigned to JAPAN SERVO (42)· patent assignee history

1982–2010Based in Kiryu, JP· patent location history

1991–2006Based in Gunma, JP· patent location history

1995–2020Patents assigned to SHARP KK (5)· patent assignee history

2001Patents assigned to JAPAN SERVO COMPANY LTD (2)· patent assignee history

2009–2012Patents assigned to NIDEC SERVO CORP (4)· patent assignee history

2015–2018Based in Saitama, JP· patent location history

2017–2019Patents assigned to NICHIA CORP (3)· patent assignee history

2017–2019Based in Anan-shi, JP· patent location history

2020Based in Sakai, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
JAPAN SERVO	42	1982–2008
SHARP KK	5	1995–2020
NIDEC SERVO CORP	4	2009–2012
NICHIA CORP	3	2017–2019
JAPAN SERVO COMPANY LTD	2	2001

Locations

Location	Patents	Span
Kiryu, JP	26	1982–2010
Gunma, JP	21	1991–2006
Sakai, JP	3	2020
Anan-shi, JP	3	2017–2019
Saitama, JP	2	2015–2018