Modular ladder assembly for mine raise
CA 2286911 A1 · Owner: Les Modules B.L.B. Inc. · Inventors: Lemire, Louis-Georges; Bruneau, Marcelin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The modular ladder assembly (20) is to be installed in upwardly inclined mine raises (10) having a peripheral wall (12) and upper and lower ends. The ladder assembly comprises a number of transverse cross-bars (24) transversely and releasably attached to the mine raise peripheral wall in vertically spaced , successive fashion. A ladder section (38) is releasably attached between each two successive cross-bars, by means of brackets (40 42) provided therefor at , the top end of the ladder section. Each two vertically successive ladder sections can be releasably attached to each other in end to end fashion thus , forming a removable continuous ladder along the mine raise. Removable rails …
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 March 27, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2020.
- 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.