Inventor

Ryuichi Katayama

Inventor

Tokyo, JP

Overview

1994–2018

Patent span

Physics

Primary field (CPC G)

Patents· 48 as inventor

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

G11Bprimary

G11BInformation storage based on relative movement between record carrier and transducer64%

H10HInorganic light-emitting semiconductor devices having potential barriers11%

G02BOptical elements, systems or apparatus8%

G01NInvestigating or analysing materials by determining their chemical or physical properties3%

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

G03BApparatus or arrangements for taking photographs or for projecting or viewing them3%

H01LSemiconductor devices3%

H01SDevices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate light2%

H04NPictorial communication, e.g. television2%

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

PatentTitleYear

10,079,032Device and recording apparatus2018 9,028,070'Light emitting element having structural bodies arrayed at a first pitch along a first direction and arrayed at a second pitch different from said first pitch along a second direction and projection display device provided with same'2015 9,016,883'Polarized light emitting element for display apparatus'2015 8,866,172'Light emitting element and image display apparatus using the light emitting element'2014 8,807,769'Wavelength plate, light emitting element, and image display device using the light emitting element'2014 8,779,454'Light emitting element and image display device using the light emitting element'2014 8,643,050'Light emitting element and image display apparatus using the light emitting element'2014 8,254,238'Optical information recording/ reproducing apparatus and optical information recording and reproducing method'2012 8,238,219'Optical information recording/reproducing device, optical unit, and optical information recording method'2012 8,045,442'Optical information recording/ reproducing device and optical information recording/ reproducing method'2011 8,036,092'Optical head device for detecting an error signal and an optical information recording/reproducing device'2011 7,948,854'Optical head apparatus and optical information recording/reproducing apparatus'2011 7,787,348'Optical head apparatus and optical information recording or reproducing apparatus'2010 7,755,991'Method for detecting radial tilt of optical recording medium in optical head device, optical head device, and optical information recording/reproducing device'2010 7,715,296'Optical head device and optical recording and reproducing apparatus'2010 7,710,849'Optical head device and optical information recording or reproducing device'2010 7,622,696'Optical head device, optical information recording/reproducing apparatus and operation method of optical information recording/reproducing apparatus'2009 7,599,276'Optical head device and optical information recording/reproduction apparatus'2009 7,564,762'Optical head device and optical information recording or reproducing device'2009 7,542,401'Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatus'2009 7,414,951'Optical head device and optical recording and reproducing apparatus'2008 7,411,882'Optical head device and optical information recording/reproducing device'2008 7,355,932'Optical disk device for detecting thickness errors of the transparent substrate'2008 7,336,576'Optical disk medium and optical disk recording/reproducing apparatus utilizing tilt detection areas having special marks'2008 7,327,643'Radial tilt compensating optical disk apparatus using tracking control loop gain'2008 7,272,091'Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatus'2007 7,242,647'Optical head unit and optical information writing/reading device'2007 7,200,076'Radial tilt detection optical head apparatus and optical information apparatus'2007 7,136,344'Optical head device and optical information recording/reproducing apparatus'2006 7,085,218'Optical head device and optical information recording or reproducing device'2006 6,980,505'Optical head apparatus including two light sources and one photodetector'2005 6,963,522'Optical head apparatus and optical information recording and reproducing apparatus'2005 6,894,958'Optical system for detecting data signal and tracking error signal'2005 6,804,180'Optical head assembly and optical information recording/reproducing device'2004 6,788,628'Optical head and optical data recording/reproducing apparatus using the same'2004 6,707,773'Optical head and optical information recording and playback apparatus'2004 6,594,206'Optical head and optical information recording/reproducing device'2003 6,434,092'Optical head for land and groove recording'2002 6,282,164'Optical head having a phase-shifting diffraction grating'2001 6,201,780'Optical head with a phase plate for different types of disks'2001 6,046,851'Polarization beam splitter and method for making the same'2000 5,875,167'Optical head device'1999 5,696,750'Optical head apparatus for different types of disks'1997 5,600,614'Optical head system having super resolution element'1997 5,570,333'Head device for magneto-optical disk'1996 5,453,963'Magneto-optical head system for detection of error and information signals by diffraction lights'1995 5,426,626'Photodetecting system for a magneto-optical disk head system'1995 5,353,267'Magneto-optical light detector apparatus'1994

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1994–2015Patents assigned to NEC CORP (47)· patent assignee history

1994–2015Based in Tokyo, JP· patent location history

2012–2015Patents assigned to KATAYAMA RYUICHI (8)· patent assignee history

2012Patents assigned to TOMINAGA SHIN (1)· patent assignee history

2014–2015Based in Minato-ku, JP· patent location history

2014Based in Saitama-shi, JP· patent location history

2018Patents assigned to INNOVASTELLA CO LTD (1)· patent assignee history

2018Patents assigned to SCHOOL JURIDICAL PERSON OF FUKUOKA KOGYO DAIGAKU (1)· patent assignee history

2018Based in Fukuoka, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NEC CORP	47	1994–2015
KATAYAMA RYUICHIself	8	2012–2015
INNOVASTELLA CO LTD	1	2018
SCHOOL JURIDICAL PERSON OF FUKUOKA KOGYO DAIGAKU	1	2018
TOMINAGA SHIN	1	2012

Locations

Location	Patents	Span
Tokyo, JP	43	1994–2015
Minato-ku, JP	3	2014–2015
Fukuoka, JP	1	2018
Saitama-shi, JP	1	2014