Method for developing thick beds of minerals
CA 2047067 C · Owner: Tripolko, Alexandr S. · Inventors: Kovtun, Vladimir Ya; Tripolko, Alexandr S.; Klishev, Vasily L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for developing thick beds of minerals accomplished by large-section rooms, comprising preparation of the room for winning which consists in executing a conveyer working below the soil of the room tothe entire length thereof, driving transport and fan drifts and raises, inclined working to fit the design contour of the room. The winning is effected in horizontal layers in a descending order by forward and reverse movements of the cutter-loader, each said layer is developed by stopes throughout the entire length of the room overlapping the cutter-loader movements. The first stope in each layer is developed in the range of raises, and subsequent - in the direction from the first stope …
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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 July 15, 1991 and granted May 5, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2013.
- 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.