Process for the production of decaffeinated tea
CA 1248812 A · Owner: Degussa Ag · Inventors: Vollbrecht, Rudiger; Klima, Hubertus; Schutz, Erwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the production of decaffeinated tea The present invention provides a process for the production of decaffeinated tea by extraction with carbon dioxide, which is supercritical with regard to pressure and temperature, in the presence of water, wherein a tea which has been adjusted to a water content of 15 to 50% by weight is first extracted at 50 to 70°C. with moist carbon dioxide at a pressure of from 260 to 350 bar, the caffein is then removed from the caffein-containing carbon dioxide in the same pressure range with active charcoal and thereafter the caffein-free carbon dioxide is recycled over the already extracted tea and the tea is separated from the carbon dioxide and …
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 January 17, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 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.