Process for preparing raw materials for washing agents
CA 2297162 A1 · Owner: Cognis Deutschland Gmbh · Inventors: Lueder, Thomas; Breucker, Christoph; Scholinakis, Konstantinos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a process for preparing solid raw materials for washing agents by simultaneously drying and granulating aqueous pastes of anionic and/or amphoteric surfactants in a horizontal thin film evaporator or drier with rotating fittings, the drying process being carried out at a temperature ranging from 120 to 130 ~C. Hydrolysis-free light-coloured, pourable products , are obtained which have a uniform grain spectrum and high bulk density.
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
- Filed February 17, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2020.
- 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.