Assignee
KUREHA CORP
JP·250 granted patents·178 pending applications·1,354 citations·filing 2000–2024
Top patents by PatentIndex Score
428 records- 0197US9708878B2Applications of degradable polymer for delayed mechanical changes in wellsKUREHA CORP·Filed 2014·Granted Jul 18, 2017·25 cites·20 claims
- 0295US10731005B2Method for producing granular polyarylene sulfide, method for increasing average particle size of granular polyarylene sulfide, method for enhancing particle strength of granular polyarylene sulfide, and granular polyarylene sulfideKUREHA CORP·Filed 2017·Granted Aug 4, 2020·5 cites·7 claims
- 0395US10227429B2Vinylidene fluoride copolymer, method for producing the same, gel electrolyte, and non-aqueous batteryKUREHA CORP·Filed 2015·Granted Mar 12, 2019·84 cites·6 claims
- 0495US9714551B2Plug for well drilling process provided with mandrel formed from degradable materialKUREHA CORP·Filed 2014·Granted Jul 25, 2017·25 cites·31 claims
- 0595US7834133B2Production process of poly(arylene sulfide)KUREHA CORP·Filed 2005·Granted Nov 16, 2010·20 cites·21 claims
- 0695US7767783B2Poly (arylene sulfide) and production process thereofKUREHA CORP·Filed 2009·Granted Aug 3, 2010·17 cites·21 claims
- 0794US10501582B2Method of producing polyarylene sulfideKUREHA CORP·Filed 2016·Granted Dec 10, 2019·5 cites·7 claims
- 0894US10407551B2Polyarylene sulfide manufacturing method and polyarylene sulfide manufacturing deviceKUREHA CORP·Filed 2018·Granted Sep 10, 2019·4 cites·10 claims
- 0994US10280264B2Method for manufacturing fine polyarylene sulfide powder, and fine polyarylene sulfide powderKUREHA CORP·Filed 2016·Granted May 7, 2019·4 cites·6 claims
- 1094US9896548B2Method of producing polyarylene sulfideKUREHA CORP·Filed 2015·Granted Feb 20, 2018·5 cites·14 claims
- 1194US8003721B2Aliphatic polyester composition and method for producing the sameKUREHA CORP·Filed 2007·Granted Aug 23, 2011·12 cites·13 claims
- 1294US7785682B2Multilayer sheet made of polyglycolic acid resinKUREHA CORP·Filed 2005·Granted Aug 31, 2010·26 cites·9 claims
- 1394US7666486B2Multi-layered biaxial stretch blow molded bottle and method for production thereofKUREHA CORP·Filed 2005·Granted Feb 23, 2010·29 cites·8 claims
- 1494US7655748B2Poly(arylene sulfide) and production process thereofKUREHA CORP·Filed 2005·Granted Feb 2, 2010·17 cites·13 claims
- 1593US10647818B2Polyarylene sulfide production method and polyarylene sulfideKUREHA CORP·Filed 2015·Granted May 12, 2020·5 cites·12 claims
- 1693US10196487B2Method of producing polyarylene sulfideKUREHA CORP·Filed 2016·Granted Feb 5, 2019·4 cites·9 claims
- 1793US8362158B2Polyglycolic acid resin compositionKUREHA CORP·Filed 2006·Granted Jan 29, 2013·14 cites·10 claims
- 1893US7455772B2Hollow-fiber porous water filtration membrane of vinylidene fluoride resin and process for producing the sameKUREHA CORP·Filed 2005·Granted Nov 25, 2008·30 cites·11 claims
- 1992US10556992B2Method of manufacturing polyarylene sulfide, and polyaryleneKUREHA CORP·Filed 2018·Granted Feb 11, 2020·4 cites·6 claims
- 2092US9422402B2Method of producing polyarylene sulfide and polyarylene sulfideKUREHA CORP·Filed 2015·Granted Aug 23, 2016·3 cites·17 claims
- 2192US8039548B2Method for purifying hydroxycarboxylic acid, method for producing cyclic ester, and method for producing polyhydroxycarboxylic acidKUREHA CORP·Filed 2007·Granted Oct 18, 2011·12 cites·6 claims
- 2292US7025908B1Optical filter and process for producing the sameKUREHA CORP·Filed 2000·Granted Apr 11, 2006·73 cites·5 claims
- 2391US7976919B2Multilayer blow molded container and production process thereofKUREHA CORP·Filed 2006·Granted Jul 12, 2011·15 cites·12 claims
- 2491US7812181B2Process for producing glycolide and glycolic acid oligomer for production of glycolideKUREHA CORP·Filed 2007·Granted Oct 12, 2010·12 cites·10 claims
- 2590US10647817B2Method of producing polyarylene sulfideKUREHA CORP·Filed 2016·Granted May 12, 2020·4 cites·7 claims
- 2690US10570255B2Method of producing polyarylene sulfideKUREHA CORP·Filed 2016·Granted Feb 25, 2020·4 cites·4 claims
- 2790US10072123B2Polyarylene sulfide production method and polyarylene sulfideKUREHA CORP·Filed 2015·Granted Sep 11, 2018·3 cites·8 claims
- 2890US9908974B2Polyarylene sulfide production method and polyarylene sulfide production apparatusKUREHA CORP·Filed 2015·Granted Mar 6, 2018·3 cites·15 claims
- 2990US7807590B2Isotropic pitch-based carbon fiber spun yarn, composite yarn and fabric using the same, and manufacturing methods thereofKUREHA CORP·Filed 2005·Granted Oct 5, 2010·8 cites·20 claims
- 3090US7799837B2Bottle excellent in recyclability and method for recycling the bottleKUREHA CORP·Filed 2008·Granted Sep 21, 2010·11 cites·6 claims
- 3190US7501464B2Process for producing aliphatic polyester compositionKUREHA CORP·Filed 2006·Granted Mar 10, 2009·11 cites·3 claims
- 3289US10738561B2Stock shape for downhole tool component, downhole tool component, and downhole toolKUREHA CORP·Filed 2016·Granted Aug 11, 2020·6 cites·21 claims
- 3389US9422400B2Granular polyarylene sulfide and process for manufacturing the sameKUREHA CORP·Filed 2013·Granted Aug 23, 2016·6 cites·12 claims
- 3489US7728100B2Process for producing polyglycolic acid resin compositionKUREHA CORP·Filed 2006·Granted Jun 1, 2010·11 cites·8 claims
- 3588US10280699B2Degradable rubber member for downhole tools, degradable seal member, degradable protecting member, downhole tool, and method for well drillingKUREHA CORP·Filed 2015·Granted May 7, 2019·4 cites·15 claims
- 3688US9267351B2Member for hydrocarbon resource collection downhole toolKUREHA CORP·Filed 2013·Granted Feb 23, 2016·9 cites·20 claims
- 3788US7781600B2Process for purifying hydroxycarboxylic acid, process for producing cyclic ester, and process for producing polyhydroxycarboxylic acidKUREHA CORP·Filed 2005·Granted Aug 24, 2010·15 cites·13 claims
- 3887US12460505B2Frac plug and method for manufacturing same, and method for sealing boreholeKUREHA CORP·Filed 2024·Granted Nov 4, 2025·0 cites·9 claims
- 3987US10945434B2Azole derivative, intermediate compound, method for producing azole derivative, agricultural or horticultural chemical agent, and protective agent for industrial materialKUREHA CORP·Filed 2018·Granted Mar 16, 2021·6 cites·15 claims
- 4087US7235673B2Glycolide production process, and glycolic acid oligomer for glycolide productionKUREHA CORP·Filed 2002·Granted Jun 26, 2007·20 cites·18 claims
- 4186US10800884B2Method of producing polyarylene sulfideKUREHA CORP·Filed 2018·Granted Oct 13, 2020·1 cites·14 claims
- 4286US10208559B2Diameter-expandable annular degradable seal member for downhole tool, plug for well drilling, and method for well drillingKUREHA CORP·Filed 2014·Granted Feb 19, 2019·9 cites·20 claims
- 4386US10196486B2Polyarylene sulfide production method and polyarylene sulfide produced using production methodKUREHA CORP·Filed 2015·Granted Feb 5, 2019·2 cites·6 claims
- 4486US7067611B2Polyhydroxycarboxylic acid and its production processKUREHA CORP·Filed 2002·Granted Jun 27, 2006·23 cites·22 claims
- 4586US7018719B2Low-temperature impact-resistant polyamide-based stretch-oriented multilayer filmKUREHA CORP·Filed 2001·Granted Mar 28, 2006·31 cites·54 claims
- 4685US11898077B2Composition and method for producing sameKUREHA CORP·Filed 2021·Granted Feb 13, 2024·1 cites·2 claims
- 4784US10010857B2Polyarylene sulfide production device provided with supply tubeKUREHA CORP·Filed 2015·Granted Jul 3, 2018·2 cites·9 claims
- 4884US9890222B2Polyarylene sulfide production device provided with baffle and baffle supportKUREHA CORP·Filed 2015·Granted Feb 13, 2018·2 cites·13 claims
- 4984US9574418B2Downhole tool member for hydrocarbon resource recoveryKUREHA CORP·Filed 2013·Granted Feb 21, 2017·3 cites·14 claims
- 5084US7993713B2Heat shrinkable multilayer film and packaging material using the sameKUREHA CORP·Filed 2007·Granted Aug 9, 2011·11 cites·11 claims
Showing the top 50 of 428 patent records by PatentIndex Score.
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →