Process for embedding liquid to solid substances in methacrylic resins
CA 2089471 C · Owner: Zeh, Jean-Luc · Inventors: Wiegert, Bernard; Zeh, Jean-Luc; Legros, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In this invention, blocks are prepared which include a substance which may be ion exchange resins contaminated with radioactive elements or water possibly containing pollutants or waste in either the solid phase, the liquid phase or block or ground form. The substance(s) to be included is coated in a (meth)acrylic resin obtained in situ by direct polymerization without prior preparation of a prepolymer syrup from a monomer system having at least one (meth)acrylic monomer with a high boiling point such as dicyclopentadienyloxyethyl methacrylate. Application is to storing industrial pollutants in particular substances contaminated by radioactive elements; also blocks that include water as …
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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 February 12, 1993 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2015.
- 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.