Method of barge mining tar sands
CA 2397574 A1 · Owner: Walsh, Glenn · Inventors: Walsh, Glenn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tar sands are flooded and then dredge mined via barges. The process ensures the tar, sands do not freeze, making excavation easier during the winter months and , reducing, slowdowns due to frost lumps. The process also eliminates the need to use trucks in the, mining pits, resulting in an overall reduction in costs.
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 August 12, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 12, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2024.
- 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.