4,4'-BIS-(.beta.-HYDROXYETHYLSULFONYL)-BIPHENYL AND ITS ESTERS
CA 1254224 A · Owner: Clariant Gmbh · Inventors: Konig, Gerd; Springer, Hartmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the general formula (1) (1), in which the Zs, preferably identical to each other each, denote a hydroxy group or a sulfato thiosulfato or phos-, phato group. They can be prepared by first converting biphenyl by sulfochlorination into biphenyl-4,4'-disulfochloride, then reducing the latter with an alkali metal or alkaline earth metal sulfite or hydrogensulfite to sulfinic acid, and in turn reacting the latter with ethylene oxide to give 4,4'-bis-(.beta.-hydroxyethylsulfonyl)-biphenyl which, can be esterified in conventional manner. They are used for modifying and improving the physical and coloristic properties of materials made of natural and/or synthetic polyamide fibers …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 16, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 16, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.