KEIWA INC.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G02F DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS 17116
 
  
 
F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR 1694
 
  
 
G02B OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS 13192
 
  
 
B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM2155
 
  
 
E01F ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE218
 
  
 
G09F DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS 237
 
  
 
B29C SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING 1124
 
  
 
B29D PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE 156
 
  
 
C09K MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR194
 
  
 
D06N WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR 113

Top Patents (by citation)

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Recent Publications

Publication # Title Filing Date Pub Date Intl Class
2014/0092,627 OPTICAL WAVEGUIDE SHEET, EDGE-LIT BACKLIGHT UNIT AND LAPTOP COMPUTERSep 27, 13Apr 03, 14[F21V]

Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9823390 Optical sheet and edge-lit backlight unitJul 08, 15Nov 21, 17[F21V, G02B]
9753320 Light diffusion sheet, and backlight unit for liquid crystal display deviceOct 01, 14Sep 05, 17[G02B, G02F]
9588277 Optical waveguide sheet, backlight unit, and portable terminalFeb 19, 15Mar 07, 17[F21V]
9581753 Optical waveguide sheet, edge-lit backlight unit and laptop computerSep 27, 13Feb 28, 17[F21V]
9568651 View angle-restricting sheet and flat panel displayMar 27, 13Feb 14, 17[G02B]
9541700 Optical sheet for use in an edge light type backlight unitAug 29, 06Jan 10, 17[F21V, G02B, G02F]
9507058 View angle-restricting sheet and flat panel displayApr 22, 13Nov 29, 16[G09F, G02B, G02F]
9507075 Optical sheet for use in an edge light type backlight unitAug 29, 06Nov 29, 16[F21V, G02B, G02F]
9448341 View angle-restriction sheet and flat panel displayApr 22, 13Sep 20, 16[G09F, G02B, G02F]
9405054 Light guide film, backlight unit for ultrathin liquid crystal display device and mobile computer, and method for producing light guide filmMar 27, 14Aug 02, 16[F21V, B29C, B29D, G02F]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2017/0176,663 EDGE-LIT BACKLIGHT UNIT AND REFLECTIVE TAPE MEMBERAbandonedJun 08, 15Jun 22, 17[F21V]
2015/0337,497 MICROWAVEABLE SHEET, AND PRODUCTION METHOD OF MICROWAVEABLE SHEETAbandonedDec 06, 13Nov 26, 15[D21H]
2015/0075,615 BACK SHEET FOR SOLAR BATTERY MODULE, PRODUCTION METHOD OF BACK SHEET FOR SOLAR BATTERY MODULE, AND SOLAR BATTERY MODULEAbandonedJan 04, 13Mar 19, 15[H01L, G02B]
2015/0000,824 ADHESIVE SHEET FOR PROTECTING BACK FACE OF SOLAR BATTERY MODULE, AND SOLAR BATTERY MODULE USING THE SAMEAbandonedSep 12, 14Jan 01, 15[B32B]
2014/0130,851 TACKY SHEET FOR PROTECTING BACK FACE OF SOLAR BATTERY MODULE, AND SOLAR BATTERY MODULE USING THE SAMEAbandonedJan 16, 14May 15, 14[H01L]
2011/0100,415 Adhesive sheet for protecting back face of solar battery module and solar battery module using the sameAbandonedNov 01, 10May 05, 11[H01L, B32B]
2011/0100,425 Heat dissipation sheet for the back face of solar battery module, and solar battery module using the sameAbandonedNov 01, 10May 05, 11[H01L]
2008/0053,512 Back sheet for photovoltaic modules and photovoltaic module using the sameAbandonedAug 28, 07Mar 06, 08[H02N]
6906761 Reflection sheet and backlight unit using the sameExpiredSep 12, 02Jun 14, 05[G02F]
2005/0068,628 Optical sheet and backlight unit using the sameAbandonedSep 27, 04Mar 31, 05[G02B, G03G]
6545827 Optical sheetExpiredSep 22, 00Apr 08, 03[F21V, G02B]

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