Method for reducing the leachability of granular material and granular material obtained using this method
CA 2031091 C · Owner: Aardelite Holding B.V. · Inventors: Teekman, Gertjan Arnold Olivier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a method for reducing the leachability of granular material, which essentially consists of an inorganic binder and a filler which, contains contaminants. According to the invention the granular material prepared is coated with a closed coating of water-insoluble and water-repellent material. Said coating being preferably a watertight and/or waterrepellent polymer composition.
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 November 29, 1990 and granted November 12, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2012.
- 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.