Assignee
KOEI CHEMICAL CO
JP·46 granted patents·13 pending applications·338 citations·filing 1971–2025
Top patents by PatentIndex Score
59 records- 0194US4323702AProcess for recovering a carboxylic acidKOEI CHEMICAL CO·Filed 1980·Granted Apr 6, 1982·43 cites·11 claims
- 0291US10689478B2Amidate compound, catalyst for polyurethane production, and method for producing polyurethane resinKOEI CHEMICAL CO·Filed 2017·Granted Jun 23, 2020·5 cites·15 claims
- 0388US4199470AMaterial for recovering uranium and method for recovering a uranium solution of high purity and high concentration, using the sameKOEI CHEMICAL CO·Filed 1978·Granted Apr 22, 1980·29 cites·21 claims
- 0485US11718704B2Catalyst for dissociation of blocking agent for blocked isocyanates, and thermosetting composition containing said catalyst for dissociation of blocking agentKOEI CHEMICAL CO·Filed 2018·Granted Aug 8, 2023·2 cites·5 claims
- 0585US9611280B2Tetraaryl borate compound and method for producing sameKOEI CHEMICAL CO·Filed 2014·Granted Apr 4, 2017·9 cites·4 claims
- 0685US3946020AProcess for producing pyridine basesKOEI CHEMICAL CO·Filed 1974·Granted Mar 23, 1976·34 cites·5 claims
- 0782US4810794AProcess for producing pyridine basesKOEI CHEMICAL CO·Filed 1987·Granted Mar 7, 1989·21 cites·20 claims
- 0878US10913724B2Production method for amidate compoundKOEI CHEMICAL CO·Filed 2018·Granted Feb 9, 2021·2 cites·9 claims
- 0978US2023295368A1Catalyst for dissociation of blocking agent for blocked isocyanates, and thermosetting composition containing said catalyst for dissociation of blocking agentKOEI CHEMICAL CO·Filed 2023·Application pending·0 cites
- 1077US4303531AMethod for adsorbing and recovering phenolsKOEI CHEMICAL CO·Filed 1979·Granted Dec 1, 1981·36 cites·14 claims
- 1172US4202806AStabilization of chlorine-containing resinsKOEI CHEMICAL CO·Filed 1978·Granted May 13, 1980·16 cites·11 claims
- 1272US2025215117A1Method for producing esterified polysaccharideKOEI CHEMICAL CO·Filed 2024·Application pending·0 cites
- 1371US2025034600A1Onium salt compositions, methods for producing cellulose hydrolysates, alcohols and/or organic acids in the presence of onium salt compositionsKOEI CHEMICAL CO·Filed 2024·Application pending·0 cites
- 1469US4778890AProcess for preparing nitrilesKOEI CHEMICAL CO·Filed 1987·Granted Oct 18, 1988·10 cites·7 claims
- 1566US5237068AProcess for producing pyridine basesKOEI CHEMICAL CO·Filed 1991·Granted Aug 17, 1993·11 cites·7 claims
- 1665US12091491B2Silylamine compound and latent curing agent comprising said silylamine compoundKOEI CHEMICAL CO·Filed 2019·Granted Sep 17, 2024·0 cites·11 claims
- 1763US6034285AProducing method for trimethylolalkaneKOEI CHEMICAL CO·Filed 1998·Granted Mar 7, 2000·11 cites·11 claims
- 1862US7411092B2Quaternary ammonium saltsKOEI CHEMICAL CO·Filed 2004·Granted Aug 12, 2008·3 cites·6 claims
- 1960US4931561AProcess for preparing nitrilesKOEI CHEMICAL CO·Filed 1988·Granted Jun 5, 1990·7 cites·5 claims
- 2060US2025034316A1Curable composition, cured product and curing catalyst for blocked isocyanate compoundKOEI CHEMICAL CO·Filed 2022·Application pending·0 cites
- 2158US2025215116A1Onium salt, onium salt composition, liquid composition containing onium salt and polysaccharide and production method thereof, and method for recovering polysaccharideKOEI CHEMICAL CO·Filed 2023·Application pending·0 cites
- 2256US12466912B2Blocked polyisocyanate composition, heat-curable resin composition, cured product, and production method thereforKOEI CHEMICAL CO·Filed 2021·Granted Nov 11, 2025·0 cites·12 claims
- 2356US5734055AProcess for preparing N-tert-butyl-2-pyrazinecarboxamide and N-tert-butyl-2-piperazinecarboxamideKOEI CHEMICAL CO·Filed 1994·Granted Mar 31, 1998·6 cites·2 claims
- 2456US5300650AProcess for producing aminomethylpyridine having a chlorine atom at α-KOEI CHEMICAL CO·Filed 1992·Granted Apr 5, 1994·8 cites·10 claims
- 2556US4418221AProcess for treating aqueous solutions containing phenolsKOEI CHEMICAL CO·Filed 1982·Granted Nov 29, 1983·6 cites·11 claims
- 2655US2026092138A1Blocked polyisocyanate composition, curable resin composition comprising the composition, and cured productKOEI CHEMICAL CO·Filed 2025·Application pending·0 cites
- 2752US2023202988A1Amidate compound, production method therefor, blocking-agent dissociation catalyst, and thermally curable resin compositionKOEI CHEMICAL CO·Filed 2021·Application pending·0 cites
- 2851US12291506B2Method for producing amidate compound, and amidate compoundKOEI CHEMICAL CO·Filed 2019·Granted May 6, 2025·0 cites·10 claims
- 2951US4182880A1,8-Naphthyridine compounds and process for preparing the sameKOEI CHEMICAL CO·Filed 1978·Granted Jan 8, 1980·3 cites·22 claims
- 3051US2025109090A1Method for producing onium salt and method for purifying onium saltKOEI CHEMICAL CO·Filed 2024·Application pending·0 cites
- 3150US6034284AProducing method for trimethylolalkaneKOEI CHEMICAL CO·Filed 1998·Granted Mar 7, 2000·6 cites·16 claims
- 3250US2023167229A1Blocked isocyanate composition, heat-curable resin composition, cured product, production method therefor, amidate compound, and catalyst for dissociation of blocking agent for blocked isocyanatesKOEI CHEMICAL CO·Filed 2021·Application pending·0 cites
- 3350US2025122322A1Zwitterionic compound, and blocking agent dissociation catalyst for blocked isocyanate, blocked isocyanate composition containing blocking agent dissociation catalyst, thermosetting resin composition, cured product and method for manufacturing same, and carbonate compoundKOEI CHEMICAL CO·Filed 2022·Application pending·0 cites
- 3450US2025122323A1Onium salt, blocking agent dissociation catalyst for blocked isocyanate, blocked isocyante composition including blocking agent dissociation catalyst, thermosetting resin composition, and cured product and manufacturing method thereforKOEI CHEMICAL CO·Filed 2022·Application pending·0 cites
- 3550US2023167310A1Curing catalyst and resin compositionKOEI CHEMICAL CO·Filed 2021·Application pending·0 cites
- 3647US4910270AComposition containing epoxy resin, di(meth)acrylate, N-heterocylic compound and polyamineKOEI CHEMICAL CO·Filed 1988·Granted Mar 20, 1990·25 cites·6 claims
- 3747US4812566AProcess for preparing 1-dodecylazacycloheptane-2-oneKOEI CHEMICAL CO·Filed 1987·Granted Mar 14, 1989·4 cites·12 claims
- 3846US5180792AAmine-cured epoxy resin with phenoxyethyl (meth) acrylatesKOEI CHEMICAL CO·Filed 1991·Granted Jan 19, 1993·9 cites·10 claims
- 3945US9365492B22-(ethylamino)ethanol production methodKOEI CHEMICAL CO·Filed 2013·Granted Jun 14, 2016·0 cites·18 claims
- 4045US9102587B2Method for producing 2-(isopropylamino)ethanolKOEI CHEMICAL CO·Filed 2013·Granted Aug 11, 2015·0 cites·15 claims
- 4144US2023095854A1Method for producing carboxylate compound and method for producing amidate compoundKOEI CHEMICAL CO·Filed 2021·Application pending·0 cites
- 4242US5424437AProcess for preparing a 2-chloro-5-aminomethyl-pyridineKOEI CHEMICAL CO·Filed 1994·Granted Jun 13, 1995·5 cites·7 claims
- 4340US4658032AProcess for producing 2,3,5-collidine and/or 2,3,5,6-tetramethylpyridineKOEI CHEMICAL CO·Filed 1985·Granted Apr 14, 1987·4 cites·2 claims
- 4438US5114604AResin bonded permanent magnet and a binder thereforKOEI CHEMICAL CO·Filed 1989·Granted May 19, 1992·5 cites·14 claims
- 4538US4314914ACatalyst supporting bedKOEI CHEMICAL CO·Filed 1980·Granted Feb 9, 1982·7 cites·5 claims
- 4637US6437122B2Method for producing a heterocyclic nitrileKOEI CHEMICAL CO·Filed 2000·Granted Aug 20, 2002·0 cites·7 claims
- 4736US6444815B1Method for producing heteroaromatic aldehydesKOEI CHEMICAL CO·Filed 1999·Granted Sep 3, 2002·2 cites·4 claims
- 4836US5208380AProcess for preparing monoallylamineKOEI CHEMICAL CO·Filed 1992·Granted May 4, 1993·2 cites·3 claims
- 4935US7342116B2Process for producing heterocyclic aldehydeKOEI CHEMICAL CO·Filed 2003·Granted Mar 11, 2008·0 cites·2 claims
- 5034US10087155B2Onium salt, liquid composition containing said onium salt and cellulose, and cellulose recovery methodKOEI CHEMICAL CO·Filed 2013·Granted Oct 2, 2018·0 cites·21 claims
Showing the top 50 of 59 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when KOEI CHEMICAL CO files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →