Assignee
KONISHI CHEM IND
JP·13 granted patents·70 citations·filing 1978–2021
Top patents by PatentIndex Score
13 records- 0188US4162270AProcess for producing 4,4'-dihydroxydiphenylsulfone of high purityKONISHI CHEM IND·Filed 1978·Granted Jul 24, 1979·23 cites·3 claims
- 0278US4820831AProcess for preparing 4,4'-dihydroxydiphenyl sulfone having high purityKONISHI CHEM IND·Filed 1986·Granted Apr 11, 1989·15 cites·6 claims
- 0374US5596128ASulfonating agent and sulfonation processKONISHI CHEM IND·Filed 1994·Granted Jan 21, 1997·16 cites·12 claims
- 0460US5189223AProcess for preparation of 4,4'-dihydroxydiphenylsulfoneKONISHI CHEM IND·Filed 1990·Granted Feb 23, 1993·7 cites·11 claims
- 0559US11634386B2Method for producing diphenylsulfone compoundKONISHI CHEM IND·Filed 2021·Granted Apr 25, 2023·0 cites·6 claims
- 0653US7456321B2Process for producing high-purity 4,4′-dihydroxydiphenyl sulfoneKONISHI CHEM IND·Filed 2003·Granted Nov 25, 2008·1 cites·13 claims
- 0748US5241121AProcess for preparation of 4,4'-dihydroxydiphenylsulfoneKONISHI CHEM IND·Filed 1992·Granted Aug 31, 1993·5 cites·7 claims
- 0843US6861562B2Process for producing mixture of dihydroxydiphenylsulfone isomersKONISHI CHEM IND·Filed 2002·Granted Mar 1, 2005·0 cites·7 claims
- 0942US6965054B2Process for producing mixture of dihydroxydiphenylsulfone isomersKONISHI CHEM IND·Filed 2002·Granted Nov 15, 2005·0 cites·7 claims
- 1041US6974886B2Process for producing dihydroxydiphenylsulfoneKONISHI CHEM IND·Filed 2003·Granted Dec 13, 2005·0 cites·19 claims
- 1140US4558161AProcess for preparing halo-substituted diarylsulfonesKONISHI CHEM IND·Filed 1983·Granted Dec 10, 1985·2 cites·5 claims
- 1238US5097074AProcess for purifying 4,4'-dihydroxydiphenylsulfoneKONISHI CHEM IND·Filed 1988·Granted Mar 17, 1992·1 cites·7 claims
- 1337US9228060B2Method for manufacturing sulfonated aromatic polymerKONISHI CHEM IND·Filed 2012·Granted Jan 5, 2016·0 cites·3 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →