Stabilization of cemented back fill areas for mines
CA 2010882 C · Owner: Sheridan, John Patrick · Inventors: Sheridan, John Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a method of stabilizing cemented back fill areas for mines. After certain mining operations have been carried out, creating mined voids it is common to back fill, for purposes of stabilizing the rock conditions in the areas where the mining operations have taken place. Generally the, back filling comprises "cementing" which is in fact placing concrete made using the coarse broken rock fraction from the mine tailings. The concrete is pumped or dumped or otherwise put into place, usually without any use of reinforcing steel bars or other reinforcement. By the present invention additional very large, aggregate pieces are placed in the back fill area at the same time 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 26, 1990 and granted May 29, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.