Assignee
KEIWA INC
JP·56 granted patents·34 pending applications·339 citations·filing 1999–2025
Top patents by PatentIndex Score
90 records- 0197US11360350B2Optical sheet, backlight unit, liquid crystal display device, and information deviceKEIWA INC·Filed 2021·Granted Jun 14, 2022·8 cites·15 claims
- 0296US11150512B2Optical sheet, backlight unit, liquid crystal display device, and information deviceKEIWA INC·Filed 2020·Granted Oct 19, 2021·4 cites·15 claims
- 0394US6606133B1Light diffusing sheet with direction-dependent diffusing abilityKEIWA INC·Filed 2000·Granted Aug 12, 2003·93 cites·8 claims
- 0487US2026079366A1Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2025·Application pending·0 cites
- 0586US12135479B2Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2024·Granted Nov 5, 2024·2 cites·10 claims
- 0684US2026079365A1Light diffusion sheet, backlight unit, liquid crystal display device, and information equipmentKEIWA INC·Filed 2025·Application pending·0 cites
- 0783US10315396B2Sheet for image display unit, laminate for image display unit, and image display unitKEIWA INC·Filed 2015·Granted Jun 11, 2019·2 cites·14 claims
- 0883US6545827B1Optical sheetKEIWA INC·Filed 2000·Granted Apr 8, 2003·28 cites·17 claims
- 0982US12292648B2Optical sheet, backlight unit, liquid crystal display device, and information deviceKEIWA INC·Filed 2023·Granted May 6, 2025·0 cites·15 claims
- 1082US11143914B2Multilayer of light diffusers, backlight unit, and liquid crystal display deviceKEIWA INC·Filed 2019·Granted Oct 12, 2021·3 cites·9 claims
- 1181US12313935B2Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unitKEIWA INC·Filed 2024·Granted May 27, 2025·0 cites·11 claims
- 1280US12535706B2Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2024·Granted Jan 27, 2026·0 cites·8 claims
- 1380US12345980B2Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2024·Granted Jul 1, 2025·0 cites·13 claims
- 1480US7755727B2Liquid crystal display moduleKEIWA INC·Filed 2007·Granted Jul 13, 2010·6 cites·5 claims
- 1579US12085807B2Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2024·Granted Sep 10, 2024·0 cites·9 claims
- 1679US6852396B1Photodiffusion sheet and backlight unit using thisKEIWA INC·Filed 1999·Granted Feb 8, 2005·80 cites·7 claims
- 1777US11966117B2Optical sheet, backlight unit, liquid crystal display apparatus, and information deviceKEIWA INC·Filed 2022·Granted Apr 23, 2024·1 cites·9 claims
- 1877US9448341B2View angle-restriction sheet and flat panel displayKEIWA INC·Filed 2013·Granted Sep 20, 2016·3 cites·12 claims
- 1977US7072115B2Light diffusion sheet and backlight unit using the sameKEIWA INC·Filed 2003·Granted Jul 4, 2006·22 cites·10 claims
- 2077US6741303B1Optical sheet and back light unit using optical sheetKEIWA INC·Filed 2000·Granted May 25, 2004·19 cites·9 claims
- 2175US11886075B2Optical sheet, backlight unit, liquid crystal display device, and information deviceKEIWA INC·Filed 2022·Granted Jan 30, 2024·0 cites·11 claims
- 2275US9568651B2View angle-restricting sheet and flat panel displayKEIWA INC·Filed 2013·Granted Feb 14, 2017·3 cites·14 claims
- 2375US6906761B2Reflection sheet and backlight unit using the sameKEIWA INC·Filed 2002·Granted Jun 14, 2005·37 cites·13 claims
- 2475US2025251626A1Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unitKEIWA INC·Filed 2025·Application pending·0 cites
- 2575US2025258407A1Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unitKEIWA INC·Filed 2025·Application pending·0 cites
- 2674US12510783B2Light diffusion sheet, backlight unit, liquid crystal display device, and information equipmentKEIWA INC·Filed 2023·Granted Dec 30, 2025·0 cites·16 claims
- 2774US2025251627A1Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2025·Application pending·0 cites
- 2874US2025333360A1Structure Protection Sheet, Concrete Block, and Method for Manufacturing Reinforced StructureKEIWA INC·Filed 2025·Application pending·0 cites
- 2973US6943855B2Reflection sheet and backlight unit using the sameKEIWA INC·Filed 2002·Granted Sep 13, 2005·16 cites·6 claims
- 3071US7986388B2Substrate film for optical sheets, optical sheet, and liquid crystal display moduleKEIWA INC·Filed 2007·Granted Jul 26, 2011·5 cites·7 claims
- 3170US10222518B2Light diffusion sheet for overlaying, and backlight unitKEIWA INC·Filed 2016·Granted Mar 5, 2019·3 cites·9 claims
- 3270US2015000824A1Adhesive sheet for protecting back face of solar battery module, and solar battery module using the sameKEIWA INC·Filed 2014·Application pending·0 cites
- 3369US12174489B2Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2024·Granted Dec 24, 2024·0 cites·10 claims
- 3469US9507058B2View angle-restricting sheet and flat panel displayKEIWA INC·Filed 2013·Granted Nov 29, 2016·1 cites·9 claims
- 3566US12197073B2Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unitKEIWA INC·Filed 2024·Granted Jan 14, 2025·0 cites·16 claims
- 3665US12105376B2Optical sheet, backlight unit, liquid crystal display apparatus, and information deviceKEIWA INC·Filed 2022·Granted Oct 1, 2024·0 cites·17 claims
- 3765US10677973B2Polarizer protective sheet, polarizer, and liquid crystal display deviceKEIWA INC·Filed 2018·Granted Jun 9, 2020·0 cites·7 claims
- 3864US12393078B2Light diffusion sheet, light diffusion sheet laminate, backlight unit, and liquid crystal display deviceKEIWA INC·Filed 2022·Granted Aug 19, 2025·0 cites·12 claims
- 3964US10921507B2Optical sheet, backlight unit, liquid crystal display device, and information equipmentKEIWA INC·Filed 2019·Granted Feb 16, 2021·1 cites·14 claims
- 4064US10901264B2Light diffusion plate and backlight unitKEIWA INC·Filed 2019·Granted Jan 26, 2021·0 cites·9 claims
- 4163US2026049229A1Structure cladding structure, coating composition, and method for manufacturing sameKEIWA INC·Filed 2023·Application pending·0 cites
- 4263US2023279273A1Protection sheet and laminate bodyKEIWA INC·Filed 2021·Application pending·0 cites
- 4362US9405054B2Light guide film, backlight unit for ultrathin liquid crystal display device and mobile computer, and method for producing light guide filmKEIWA INC·Filed 2014·Granted Aug 2, 2016·1 cites·13 claims
- 4462US2025076706A1Light-diffusing sheet, backlight unit, liquid crystal display device, and information apparatusKEIWA INC·Filed 2024·Application pending·0 cites
- 4562US2025179819A1Roof repair methodKEIWA INC·Filed 2023·Application pending·0 cites
- 4662US2025180948A1Light diffusion sheet, light diffusion sheet laminate, backlight unit, and liquid crystal display deviceKEIWA INC·Filed 2025·Application pending·0 cites
- 4762US2024231147A1Optical sheet, backlight unit, liquid crystal display apparatus, and information deviceKEIWA INC·Filed 2024·Application pending·0 cites
- 4861US12105378B2Light diffusion sheet, backlight unit, liquid crystal display device, information apparatus, and method for manufacturing light diffusion sheetKEIWA INC·Filed 2024·Granted Oct 1, 2024·0 cites·15 claims
- 4961US9977171B2Optical waveguide sheet, backlight unit, and portable terminalKEIWA INC·Filed 2015·Granted May 22, 2018·1 cites·7 claims
- 5060US10802335B2Light diffusion plate and direct-lit backlight unitKEIWA INC·Filed 2018·Granted Oct 13, 2020·0 cites·4 claims
Showing the top 50 of 90 patent records by PatentIndex Score.
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →