Tar sands treatment
CA 1234351 A · Owner: Henderson, George H. · Inventors: Henderson, George H.; Parker, Alan M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of mining deposits of discrete materials such as oil bearing sands disposed between an overburden and an underlying competent rock stratum in which at least one pilot hole is vertically drilled from the surface through the overburden and through the formation of discrete solids into the underlying competent rock stratum, an access drift or tunnel is driven in the competent rock stratum to intersect the vertical pilot hole, a sump is formed in the drift or tunnel below the pilot hole, the pilot hole drill bit is removed and a mechanical-hydraulic excavator head is attached to the drill string, a collection raise is excavated upwardly from the drift or tunnel concentric with the …
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
- Granted March 22, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 22, 2005.
- 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.