Method and composition for filtering beer, ale or malt liquor to reduce multivalent metal cations
CA 2044868 C · Owner: Smith, Timothy R. · Inventors: Smith, Timothy R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is a method of reducing multivalent metal cations from beer, ale or malt liquors comprising the steps of: providing an alkali metal silicate-treated finely divided diatomaceous earth (DTE); and contacting the beer, ale or malt liquor with the silicate-treated DTE by filtering the beer through the silicate-treated DTE thereby reducing the multivalent metal cation content of the beer ale or malt liquor.
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 June 18, 1991 and granted August 13, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 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.