Manufacture of acyl isethionates
CA 1187893 A · Owner: Unilever Plc · Inventors: Lamberti, Vincent; Boen, Laurence K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention discloses a method of producing directly esterified fatty acyl isethionate having a yellowness index less than 6Ø A fatty acid is reacted with an alkali metal isethionate in the presence of a catalyst comprising a zinc salt of an organic sulphonic acid or a mixture of ZnO and an organic sulphonic acid. The molar ratio of ZnO to organic sulphonic acid is about 1:2 or less.
Read the whole patent
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 28, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2002.
- 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.