Mine cooling
CA 1292879 C · Owner: Van Der Walt, Johannes · Inventors: Van Rensburg, Carl Stefanus Janse; Van Der Walt, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A subterranean excavation such as a mine working is cooled by a refrigeration plant having a heat rejection system at an upper station and a heat absorption system in the excavation the, refrigerant medium being ammonia. The system includes a surge drum at the upper station and maybe also at the excavation. Safety measures include the location of the vapour and liquid pipes in a borehole separate from the mine shaft or shafts.
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 December 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2008.
- 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.