Waste dump comprising a storage space with impermeable wall of material with pozzolanic properties
CA 2000454 A1 · Owner: Pelt & Hooykaas B.V. · Inventors: Hooykaas, Carel W. J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A waste dump (1) for waste material (8) consisting of a partially underground tank (2) having rigid hydraulically set walls (3) with self-restoring capacity when cracks (5) occur in said walls. The walls may consist of rigid concrete having on their inner side a self-restoring layer (4) when cracks occur, but the walls may also completely consist of such a self-restoring layer. The self-restoring capacity of the layer and wall respectively is obtained by the presence of still hydraulically settable material with pozzolanic properties in said hydraulically set layer and/or wall. The self-restoring layer is formed from ground granulated blast furnace slag with fine or coarse blast …
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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 October 11, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2011.
- 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.