Inventor

Keitaro Yamashita

Inventor

Saitama, JP

Overview

111→

Patents

1977–2021

Patent span

Physics

Primary field (CPC G)

Patents· 111 as inventor

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

G03Gprimary

G03GElectrography25%

G09GArrangements or circuits for control of indicating devices using static means to present variable information16%

G11BInformation storage based on relative movement between record carrier and transducer12%

H04NPictorial communication, e.g. television9%

H01FMagnets6%

B03CMagnetic or electrostatic separation of solid materials from solid materials or fluids3%

G11CStatic stores3%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein3%

G06FElectric digital data processing3%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%

PatentTitleYear

11,032,499Solid-state image sensor and imaging apparatus2021 10,546,540Displays with multiple scanning modes2020 10,482,822Displays with multiple scanning modes2019 10,375,278Noise cancellation2019 10,311,782Light-emitting diode display with reduced leakage2019 10,249,254Devices and methods for discharging or harvesting VCOM charge in electronic displays2019 10,109,240Displays with multiple scanning modes2018 10,101,853Display with shallow contact holes and reduced metal residue at planarization layer steps2018 10,078,405Displays with gate driver circuitry for discharging display pixels2018 10,048,788Touch screen display uniformity2018 10,042,409Devices and methods for preventing image artifacts on touch sensitive electronic displays2018 9,842,551'Display driver circuitry with balanced stress'2017 9,734,783'Displays with high impedance gate driver circuitry'2017 9,466,252'Partial scanning gate driver and liquid crystal display using the same'2016 9,299,452'Shift registers, display panels, display devices, and electronic devices'2016 9,208,714'Display panel for refreshing image data and operating method thereof'2015 9,159,283'Switch circuit, pixel element and display panel for using in refreshing memory in pixel'2015 9,129,578'Shift register circuit and display device using the same'2015 8,928,829'Display device'2015 8,866,711'Driving method including refreshing a pixel memory and liquid crystal display device utilizing the same'2014 8,860,652'Shift registers, display panels, display devices, and electronic devices'2014 8,736,591'Display device using pixel memory circuit to reduce flicker with reduced power consumption'2014 8,665,248'Drive circuit'2014 8,564,519'Operating method and display panel using the same'2013 8,508,516'Active matrix type display device and portable machine comprising the same'2013 8,421,807'Display device'2013 8,416,159'Display apparatus'2013 8,395,573'Liquid crystal display having sub-pixels provided with three different voltage levels'2013 8,022,852'Digital-analog converter circuit'2011 7,948,295'Miniaturized demultiplexer and electronic device using same'2011 7,940,083'Semiconductor integrated circuit'2011 7,928,948'Matrix addressing circuitry and liquid crystal display device using the same'2011 7,859,508'Liquid crystal driving circuit and liquid crystal display device including multiple shift registers and an enable switch to allow partial driving'2010 7,755,454'Micro-electromechanical device'2010 7,688,394'Active matrix liquid crystal display device having a flicker eliminating circuit'2010 7,579,901'Charge pump circuit and electronic circuit provided therewith, and method for driving charge pump circuit'2009 7,463,105'Microresonator, band-pass filter, semiconductor device, and communication apparatus'2008 7,433,145'Magnetic disk apparatus'2008 7,382,176'Charge pump circuit'2008 7,177,528'Disk drive apparatus, and data processing method for use with disk drive apparatus'2007 6,590,937'Efficient motion vector detection'2003 RE037834'Magnetic roll and method of producing same'2002 6,421,519'Magnet roll having an anisotropic bonded magnet portion containing rare earth-iron-nitrogen magnet powder'2002 6,411,457'Recording/reproducing method and recording/reproducing apparatus'2002 6,215,609'Recording/reproducing method and recording/reproducing apparatus'2001 6,201,942'Developer-carrying member, and developing device and image forming apparatus including the member'2001 6,057,995'Disc cartridge with aperture for access to disc provided with shutter arranged for minimizing overall size of cartridge'2000 5,963,702'Device and method for recording broadcast signal'1999 5,897,246'Magnet roll and developing method using the same'1999 5,761,180'Signal processing for selective temporal data recording and reproduction'1998 5,668,519'Magnet roll and method of producing same'1997 5,659,861'Method of developing electrostatic latent image'1997 5,649,362'Permanent magnet member and method of producing same'1997 5,608,502'Method for treating magnet roll by blasting with nonmagnetic spherical particles'1997 5,583,473'Magnet roll and method of producing same'1996 5,539,368'Magnet roll and method of producing same'1996 5,537,216'Circuit for including a copy-inhibit signal with a video signal'1996 5,523,853'Circuit for including a copy-inhibit signal with a video signal'1996 5,510,900'Video signal recording apparatus with rerecording inhibit circuit'1996 5,498,837'Sleeve for developing roll member'1996 5,488,341'Permanent magnet member and method of producing same'1996 5,381,275'Apparatus and method for recording digital data with a controlled data compression ratio'1995 5,359,477'Recording and/or reproducing apparatus having a cassette loading apparatus'1994 5,315,445'Audio signal recording apparatus and method for use with VTR'1994 5,287,196'Method and apparatus for recording video information signals to avoid interference during after-recording'1994 5,276,560'Rotary magnetic type recording apparatus'1994 5,182,680'Recording control system'1993 5,146,380'Reel lock mechanism for tape cassette'1992 5,121,259'Video tape recorder with after-recording capability'1992 RE033770'Heat-fixing apparatus'1991 5,038,219'Video signal recording apparatus'1991 4,992,767'Magnet roll'1991 4,911,100'Developing apparatus'1990 4,814,819'Heat-fixing apparatus'1989 4,752,805'Toner recycling unit'1988 4,714,819'Directly heating fixing apparatus having current collecting bearings'1987 4,660,505'Developing apparatus'1987 4,639,116'Printer/copier with disposable toner cartridge'1987 4,622,614'Magnetic erasing head'1986 4,601,259'Developing apparatus'1986 4,597,661'Magnet roll assembly'1986 4,558,294'Magnet roll and method of producing the same'1985 4,526,130'Developing apparatus'1985 4,521,184'Pressure fixing device'1985 4,496,240'Apparatus for controlled delivery of magnetic toner'1985 4,441,636'Toner cartridge'1984 4,436,055'Developing apparatus'1984 4,435,494'Process for depositing magnetic toner material on electrostatic latent images'1984 4,433,041'Recording method'1984 4,431,298'Apparatus for brush development including means for detecting toner in the toner bath and means for supplying toner to the toner bath'1984 4,426,411'Method of fabricating a steel pressure roll for use in a pressure-fixation apparatus'1984 4,420,242'Magnetic brush developing and cleaning process'1983 4,383,498'Apparatus for applying magnetic toner to a magnetic transport roll'1983 4,342,282'Toner cartridge'1982 4,309,498'Electrophotography using a magnetic brush'1982 4,302,837'FM Multiplex system for selectively delaying one of two audio signals'1981 4,288,515'Process for reversal development using inductively chargeable magnetic powdery developer'1981 4,268,875'Avoidance of disturbance of horizontal sync signals in video signal reproduced at other than standard tape speed'1981 4,266,328'Developing roll for use in electrostatic developing apparatus employing magnetic particles'1981 4,267,248'Magnet-brush development process of electric pattern images'1981 4,263,390'Residual toner removing device'1981 4,261,290'Electrostatic developing apparatus having a developer powder mixing device'1981 4,245,024'Development process for an electrophotographic duplicator employing magnetic toner'1981 4,237,819'Image developing machine using magnetic toner'1980 4,231,320'Magnetic brush-toner supply hopper'1980 4,169,998'Iron core assembly for magnetizing columnar permanent magnets for use in electrostatic developing apparatus'1979 4,168,481'Core assembly for magnetizing columnar permanent magnet for use in an electrostatic developing apparatus'1979 4,167,718'Dies set for magnetizing outer surface of magnetic column'1979 4,166,263'Magnetic core assembly for magnetizing columnar permanent magnet for use in electrostatic developing apparatus'1979 4,041,903'Developing device for use in electrophotography'1977 4,008,686'Developing device for use in electrophotography'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–2002Based in Kamisato, JP· patent location history

1979–2002Patents assigned to HITACHI METALS LTD (41)· patent assignee history

1981–2021Patents assigned to SONY CORP (26)· patent assignee history

1981–2002Based in Saitama, JP· patent location history

1981–2011Based in Tokyo, JP· patent location history

1984–2016Patents assigned to YAMASHITA KEITARO (13)· patent assignee history

1993–2021Based in Kanagawa, JP· patent location history

2011–2015Patents assigned to CHIMEI INNOLUX CORP (10)· patent assignee history

2017–2020Patents assigned to APPLE INC (12)· patent assignee history

2017–2019Based in Nishinomiya, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI METALS LTD	41	1979–2002
SONY CORP	26	1981–2021
YAMASHITA KEITAROself	13	1984–2016
APPLE INC	12	2017–2020
CHIMEI INNOLUX CORP	10	2011–2015

Locations

Location	Patents	Span
Saitama, JP	24	1981–2002
Tokyo, JP	17	1981–2011
Kamisato, JP	17	1977–2002
Kanagawa, JP	11	1993–2021
Nishinomiya, JP	7	2017–2019