Inventor
UTSUNOMIYA HAJIME
JP75 patents
⚠️ This page may combine multiple inventors who share the name “UTSUNOMIYA HAJIME”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TDK CORP
48 patentsUS7166347B2Jan 23, 2007
Optical information recording medium
TDK CORP62 citations98
US6965556B1Nov 15, 2005
Optical information medium having high resolution beyond a diffraction limit and reading method
TDK CORP68 citations98
US6329036B1Dec 11, 2001
Optical recording medium and use
TDK CORP60 citations96
US6154437ANov 28, 2000
Phase-change optical recording medium and its writing with high reliability after long period use and/or high environmental temperature storage
TDK CORP59 citations96
US6040030AMar 21, 2000
Optical recording medium
TDK CORP69 citations96
US5430706AJul 4, 1995
Magneto-optical disk having lands and grooves for recording information
TDK CORP62 citations96
US6030679AFeb 29, 2000
Optical recording material and its fabrication method
TDK CORP53 citations95
US7182990B2Feb 27, 2007
Optical information recording medium
TDK CORP36 citations93
US7167440B2Jan 23, 2007
Optical information recording medium
TDK CORP41 citations93
US7160597B2Jan 9, 2007
Optical information recording medium
TDK CORP43 citations93
US7157128B2Jan 2, 2007
Optical information recording medium
TDK CORP42 citations93
US7141289B2Nov 28, 2006
Optical information recording medium
TDK CORP28 citations93
US7141288B2Nov 28, 2006
Optical information recording medium
TDK CORP26 citations93
US6996055B2Feb 7, 2006
Optical recording medium and method for optically recording data in the same
TDK CORP26 citations93
US6537721B2Mar 25, 2003
Optical recording medium and method for its initialization
TDK CORP39 citations93
US6461710B1Oct 8, 2002
Optical recording medium
TDK CORP41 citations93
US6438085B1Aug 20, 2002
Optical recording method
TDK CORP26 citations93
US6430128B1Aug 6, 2002
Method for reading optical information medium and optical information medium
TDK CORP40 citations93
US6169722B1Jan 2, 2001
Phase change type optical recording medium having minute length recorded marks
TDK CORP24 citations93
US6115351ASep 5, 2000
Phase change optical recording medium and its writing with high reliability after long period use and/or high environmental temperature storage
TDK CORP18 citations93
US5965323AOct 12, 1999
Method for preparing optical recording medium
TDK CORP42 citations93
US5700567ADec 23, 1997
Magneto-optical recording medium
TDK CORP30 citations93
US7154836B2Dec 26, 2006
Optical recording/reproducing method and optical recording medium
TDK CORP27 citations92
US7136343B2Nov 14, 2006
Optical recording/reproducing method and optical recording medium
TDK CORP25 citations92
US6103330AAug 15, 2000
Optical recording medium and fabrication method therefor
TDK CORP39 citations92
US5593789AJan 14, 1997
Magneto-optical recording medium
TDK CORP41 citations92
US5577020ANov 19, 1996
Magneto-optical disc with intermediate film layer between a recording film and a dielectric film
TDK CORP40 citations92
US5552237ASep 3, 1996
Magnetooptical recording medium
TDK CORP33 citations92
US7143426B2Nov 28, 2006
Multilayer optical recording medium with thickness ranges reducing interlayer cross-talk
TDK CORP20 citations84
US6677104B2Jan 13, 2004
Optical information medium
TDK CORP14 citations84
US6249509B1Jun 19, 2001
Optical device with protective cover
TDK CORP16 citations84
US6192024B1Feb 20, 2001
Optical recording medium
TDK CORP19 citations84
US4849304AJul 18, 1989
Optical recording medium
TDK CORP19 citations82
US12248205B2Mar 11, 2025
Optical modulation element and method for driving optical modulation element
TDK CORP2 citations75
US7197005B2Mar 27, 2007
Optical recording method and medium
TDK CORP7 citations74
US6999392B2Feb 14, 2006
Optical recording method and optical recording medium
TDK CORP8 citations74
US6665260B2Dec 16, 2003
Optical recording medium including protruding winding parts used as prepits
TDK CORP7 citations74
US6605328B2Aug 12, 2003
Optical recording medium
TDK CORP6 citations74
US6515952B1Feb 4, 2003
Optical recording method
TDK CORP7 citations74
US6495308B2Dec 17, 2002
Optical recording method and optical recording medium
TDK CORP7 citations74
US6449240B1Sep 10, 2002
System, method and information medium for storing and reading information as a difference in a surface potential or a surface charge density
TDK CORP10 citations74
US6146733ANov 14, 2000
Optical recording medium
TDK CORP14 citations74
US6125101ASep 26, 2000
Phase-change type optical recording medium having recording marks wider than a recording track
TDK CORP8 citations74
US5710746AJan 20, 1998
Magneto-optical recording medium and reading method with magnetic layers of different coercivity
TDK CORP7 citations74
US4902584AFeb 20, 1990
Optical recording medium
TDK CORP14 citations74
US6898174B2May 24, 2005
Optical recording medium
TDK CORP7 citations73
US6496462B2Dec 17, 2002
Optical recording method, optical recording apparatus, and optical recording medium
TDK CORP8 citations73
US7701838B2Apr 20, 2010
Optical information medium including an information bearing surface and a functional layer, and reading method
TDK CORP2 citations63
TDKCORPORATION
2 patentsShowing the top 50 of 75 patents by PatentIndex Score.