Location system
CA 2103504 A1 · Owner: Advanced Mining Software Limited · Inventors: Joubert, Francois Daniel; Bernard, Hermanus Adriaan; Crook, Robert David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A location system for tracking miners underground includes a number of identification stations connected to a central control station. Miners are issued with portable identification modules which are fitted to their caplamps and which are powered by their battery packs. The identification modules transmit unique identification signals at intervals which are picked up by the, identification stations. The identification modules change the intervals between successive transmissions continually and the identification stations, can read overlapping transmissions so that the reliability of detection is good. Miners who are issued with a caplamp first pass an identification card through a reader, …
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 6, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2015.
- 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.