Composition for treating water and sanitising soils
CA 2179318 C · Owner: Willuweit, Thomas · Inventors: Willuweit, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition for treating water and soils contains (A) CaCO3; (B) CaCl2 and/or Ca(NO3)2 and if required magnesium salts; (C) NaHCO3 and if required KHCO3. The quantitative ratio between components A and B lies between 0.1: 1 and 2: 1 and the quantitative ratio between components B and C lies between 1: 3 and 2: 1.
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 December 27, 1994 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2016.
- 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.