Polyhydroxyl compounds containing a sulfonic acid ester group
CA 1292008 C · Owner: Freitag, Dieter · Inventors: Prater, Klaus; Freitag, Dieter; Uerdingen, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of a polyhydroxyl compound which contains at least one sulphonic acid ester group prepared by (i) reacting a paraffin sulphochloride with an alcohol in the presence of a hydrogen chloride acceptor to form a solution of the polyhydroxyl compound in an organic phase, (ii) dissolving the organic phase in a suitable solvent, (iii) washing, dewatering and removing the solvent by distillation. The polyhydroxyl compound thus formed is suitable for the preparation of polyurethane cast resins.
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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 November 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2008.
- 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.