Concrete recovery system
CA 2357622 C · Owner: Knelson Patents Inc. · Inventors: Lowe, Alan Joseph; Beckham, David James; Fullam, Michael John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for recovering usable material from waste concrete is herein described. Specifically waste concrete is mixed with water containing hydration stabilization admixtures forming an aggregate slurry. The aggregates are then removed from the slurry for recycling. The slurry itself is then used for mixing with additional waste concrete during which time the density of the slurry is monitored and action taken to ensure that the density of the slurry remains within acceptable parameters. The slurry is then used in place of fresh water when preparing subsequent batches of concrete.
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 September 24, 2001 and granted December 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2023.
- 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.