Method and system for mining hydrocarbon-containing materials
CA 2623698 C · Owner: Oil Sands Underground Mining, Inc. · Inventors: Kobler, Michael Helmut; Watson, John David; Drake, Ronald B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed, inter alia to devices and methods for excavating valuable materials particularly soft ores such as oil sands oil shales, and the like, that use one or more of a number of features including backfilling for ground support a small trailing access tunnel, processing of the valuable material in the excavation with the tailings optionally being used as backfill and the valuable material being transported to the surface a plurality of movable shields for ground support and/or a movable tail shield to provide interim support to the backfill while additional liner sections are installed and/or formed.
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 March 12, 2001 and granted May 29, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.