Inventor · disambiguated record
Sei Nakahara
Also filed as: NAKAHARA SEI
41 granted patents·3 pending applications·592 citations·filing 1996–2006
98Inventor score
Top patents by PatentIndex Score
44 records- 0195US6482981B2Method for producing acrylic acidNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Nov 19, 2002·41 cites·16 claims
- 0295US6444744B1Hydrophilic resin, absorbent article, and acrylic acid for polymerizationNIPPON CATALYTIC CHEM IND·Filed 1999·Granted Sep 3, 2002·114 cites·17 claims
- 0395US6414183B1Method for handling waste oilNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Jul 2, 2002·45 cites·18 claims
- 0493US9062140B2Polyacrylic acid (salt) water-absorbent resin, production process thereof, and acrylic acid used in polymerization for production of water-absorbent resinFUJIMARU HIROTAMA·Filed 2006·Granted Jun 23, 2015·18 cites·10 claims
- 0590US7534339B2Reactor filled with solid particle and gas-phase catalytic oxidation with the reactorNIPPON CATALYTIC CHEM IND·Filed 2006·Granted May 19, 2009·13 cites·15 claims
- 0686US7049366B2Acrylic acid composition and its production process, and process for producing water-absorbent resin using this acrylic acid composition, and water-absorbent resinNIPPON CATALYTIC CHEM IND·Filed 2002·Granted May 23, 2006·24 cites·47 claims
- 0785US6966973B2Apparatus and process for producing (meth)acrylic acidNIPPON CATALYTIC CHEM IND·Filed 2002·Granted Nov 22, 2005·12 cites·17 claims
- 0884US6657079B1Method for mixing gases and apparatus thereforNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Dec 2, 2003·17 cites·17 claims
- 0984US6300513B2Method of stabilizing N-oxyl compounds in vinyl compoundsNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Oct 9, 2001·13 cites·12 claims
- 1084US5785821AProcess for the production of acrylic acidNIPPON CATALYTIC CHEM IND·Filed 1996·Granted Jul 28, 1998·30 cites·5 claims
- 1183US6695928B1Method for production of (meth) acrylic acid and/or (meth)acrylic estersNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Feb 24, 2004·13 cites·19 claims
- 1282US6372944B1Liquid withdrawing tray for purification column, purification column, and method for purificationNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Apr 16, 2002·11 cites·3 claims
- 1381US7319167B2Method for distilling (meth)acrylic acid and/or the ester thereofNIPPON CATALYTIC CHEM IND·Filed 2004·Granted Jan 15, 2008·10 cites·14 claims
- 1481US6441228B2Apparatus and process for producing (meth)acrylic acidNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Aug 27, 2002·18 cites·2 claims
- 1580US6649028B2Column treating process and apparatus thereofNIPPON CATALYTIC CHEM IND·Filed 2002·Granted Nov 18, 2003·12 cites·2 claims
- 1680US6642414B2Method for production of (meth) acrylic acidNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Nov 4, 2003·12 cites·20 claims
- 1780US6599397B2Method for preventing polymerization of (meth)acrylic acid and esters thereof and method for the production thereofNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Jul 29, 2003·12 cites·4 claims
- 1877US6891061B1Packed column and polymerizable compound treating method using the sameNIPPON CATALYTIC CHEM IND·Filed 2000·Granted May 10, 2005·15 cites·7 claims
- 1976US6848501B2Method for preventing plate type heat exchanger from blockageNIPPON CATALYTIC CHEM IND·Filed 2003·Granted Feb 1, 2005·16 cites·19 claims
- 2075US6787001B2Method for distilling (meth) acrylic acid solutionNIPPON CATALYTIC CHEM IND·Filed 2002·Granted Sep 7, 2004·20 cites·18 claims
- 2175US6649787B1Method for preparing (meth) acrylic acid esterNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Nov 18, 2003·7 cites·1 claims
- 2272US6676808B2Method for starting up distilling columnNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Jan 13, 2004·19 cites·6 claims
- 2370US7282118B2Method for production of easily polymerizable substance and purification apparatusNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Oct 16, 2007·16 cites·10 claims
- 2469US6084127AMethod for recovering acrylic acidNIPPON CATALYTIC CHEM IND·Filed 1998·Granted Jul 4, 2000·11 cites·11 claims
- 2567US7147048B2Shell-and-tube type heat exchanger and method for production of (meth) acrylic acid by use of the exchangeNIPPON CATALYTIC CHEM IND·Filed 2002·Granted Dec 12, 2006·8 cites·4 claims
- 2665US6348135B1Process for the purification of (meth) acrylic acid and/or its esterNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Feb 19, 2002·20 cites·14 claims
- 2762US7048834B2Method for purification of acrylic acidNIPPON CATALYTIC CHEM IND·Filed 2000·Granted May 23, 2006·3 cites·10 claims
- 2862US6660881B2Process for producing (meth)acrylic esterNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Dec 9, 2003·3 cites·11 claims
- 2961US7326810B2Method for starting up reactorNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Feb 5, 2008·1 cites·3 claims
- 3061US6469202B2Method for disposal of solid catalystNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Oct 22, 2002·6 cites·9 claims
- 3159US6566551B2Method for preventing effluent gas pipe from blockingNIPPON CATALYTIC CHEM IND·Filed 2000·Granted May 20, 2003·2 cites·17 claims
- 3259US6540881B1Method for refining (meth)acrylic acidNIPPON CATALYTIC CHEM IND·Filed 2000·Granted Apr 1, 2003·14 cites·15 claims
- 3358US6736200B2Heat-exchanging method for easily polymerizable compoundNIPPON CATALYTIC CHEM IND·Filed 2000·Granted May 18, 2004·3 cites·9 claims
- 3454US7326811B2Method for production of (meth)acrylic acid by use of a shell-and-tube heat exchangerNIPPON CATALYTIC CHEM IND·Filed 2006·Granted Feb 5, 2008·0 cites·6 claims
- 3554US7038081B2Method for producing polyacrylic acidNIPPON CATALYTIC CHEM IND·Filed 2003·Granted May 2, 2006·2 cites·8 claims
- 3652US6651731B2Method for cooling heating grade heat exchanger in unsteady stateNIPPON CATALYTIC CHEM IND·Filed 2002·Granted Nov 25, 2003·5 cites·9 claims
- 3746US6664418B1Method for inhibiting polymerization of a vinyl compoundNIPPON CATALYTIC CHEM IND·Filed 1999·Granted Dec 16, 2003·3 cites·10 claims
- 3843US6588450B2Storage tank for viscous oil containing easily polymerizable compoundsNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Jul 8, 2003·0 cites·21 claims
- 3943US2003006026A1Reactor filled with solid particle and gas-phase catalytic oxidation with the reactorFiled 2002·Application pending·0 cites
- 4043US2002098123A1Liquid withdrawing tray for purification column, purification column, and method for purificationFiled 2002·Application pending·0 cites
- 4141US6495045B2Solid substance removing deviceNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Dec 17, 2002·0 cites·6 claims
- 4239US2003143143A1Process for treating wastes from acrylic acid and polyacrylic acid production processesFiled 2003·Application pending·0 cites
- 4337US6613196B2Method for stopping purifying columnNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Sep 2, 2003·3 cites·6 claims
- 4435US6452040B2Production process for hydroxyalkyl (meth)acrylateNIPPON CATALYTIC CHEM IND·Filed 2001·Granted Sep 17, 2002·0 cites·6 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →