A process and apparatus for the liquid phase extraction of coffee
CA 2040952 C · Owner: Societe Des Produits Nestle S.A. · Inventors: Wehrspann, Olaf; Schlecht, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The liquid extract percolates through the extraction cells 1,2,3,4,5,6, is filtered through a filtration unit 7 before being centrifuged in a centrifuge 8 a pipe 10, removing the purified liquid while the sludge produced is reintroduced into the extraction cells by a recycling circuit 9. Application to the liquid-phase extraction of coffee.
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 April 22, 1991 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2013.
- 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.