| Title of Invention | A PROCESS FOR THE PREPARATION OF DIPHENYLSULFONE COMPOUNDS |
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| Abstract | A process by which a high-purity 4,4'-dihydroxydiphenyl sulfone monoether can be industrially advantageously obtained. The process, which is for producing a compound represented by the formula (I) (I) (wherein R?1¿ and R?2¿ each independently represents halogeno, C¿1-8? alkyl, or C¿2-8? alkenyl; m and n each independently is an integer of 0 to 4; and R?3¿ represents C¿1-8? alkyl, C¿2-8? alkenyl, C¿3-8? cycloalkyl, or optionally substituted aralkyl), comprises (1) conducting pH adjustment two or more times in a purification step, (2) removing the alkyl halide used in excess, (3) using a solvent, e.g., water, having an iron content of 0.05 ppm or lower, (4) using a vessel coated inside with a corrosion-resistant layer, (6) adding a chelating agent, and (7) using a means for drying with mechanical stirring |
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67-KOLNP-2005-(08-10-2013)-ABSTRACT.pdf
67-KOLNP-2005-(08-10-2013)-CLAIMS.pdf
67-KOLNP-2005-(08-10-2013)-CORRESPONDENCE.pdf
67-KOLNP-2005-(08-10-2013)-FORM-3.pdf
67-KOLNP-2005-(08-10-2013)-OTHERS.pdf
67-KOLNP-2005-(08-10-2013)-PETITION UNDER RULE 137.pdf
67-KOLNP-2005-(08-11-2013)-CORRESPONDENCE.pdf
67-KOLNP-2005-(08-11-2013)-FORM-3.pdf
67-KOLNP-2005-(08-11-2013)-PETITION UNDER RULE 137.pdf
67-KOLNP-2005-(15-05-2012)-CORRESPONDENCE.pdf
67-KOLNP-2005-(25-09-2013)-CORRESPONDENCE.pdf
67-KOLNP-2005-(25-09-2013)-TRANSLATED COPY OF PRIORITY DOCUMENT.pdf
67-KOLNP-2005-(26-03-2013)-CORRESPONDENCE.pdf
67-KOLNP-2005-(26-03-2013)-ENGLISH TRANSLATION.pdf
67-KOLNP-2005-(26-03-2013)-FORM 1.pdf
67-KOLNP-2005-(26-03-2013)-FORM 2.pdf
67-KOLNP-2005-(26-03-2013)-FORM 3-1.pdf
67-KOLNP-2005-(26-03-2013)-FORM 3.pdf
67-KOLNP-2005-(26-03-2013)-FORM 5.pdf
67-KOLNP-2005-(26-03-2013)-FORM 6.pdf
67-KOLNP-2005-(26-03-2013)-OTHERS.pdf
67-KOLNP-2005-(26-03-2013)-PA.pdf
67-KOLNP-2005-(26-04-2013)-CORRESPONDENCE.pdf
67-KOLNP-2005-(26-04-2013)-PA.pdf
67-KOLNP-2005-CORRESPONDENCE-1.1.pdf
67-kolnp-2005-correspondence.pdf
67-kolnp-2005-description (complete).pdf
67-kolnp-2005-specification.pdf
| Patent Number | 262959 | ||||||||||||||||
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| Indian Patent Application Number | 67/KOLNP/2005 | ||||||||||||||||
| PG Journal Number | 40/2014 | ||||||||||||||||
| Publication Date | 03-Oct-2014 | ||||||||||||||||
| Grant Date | 25-Sep-2014 | ||||||||||||||||
| Date of Filing | 19-Jan-2005 | ||||||||||||||||
| Name of Patentee | NIPPON SODA CO. LTD. | ||||||||||||||||
| Applicant Address | 2-1, OHTEMACHI 2-CHOME, CHIYODA-KU, TOKYO | ||||||||||||||||
Inventors:
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| PCT International Classification Number | C07C 315/06 | ||||||||||||||||
| PCT International Application Number | PCT/JP2002/00410 | ||||||||||||||||
| PCT International Filing date | 2002-01-22 | ||||||||||||||||
PCT Conventions:
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