Mine roof bolt assembly
CA 2439397 A1 · Owner: Mansour Mining Inc. · Inventors: Wu, Yaokun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mine roof bolt assembly for use in a bolt hole includes a rebar having an externally, threaded end and a nut or other suitable fastener which is configured to threadedly engage the, threaded end of the rebar. Bores formed through the nut and rebar are configured for alignment, when the nut is positioned on the rebar in a first or initial position. A pair of shear pins are, inserted so as to locate partially within segments of the bore formed in the nut, as well as within, the bore formed through the rebar. The pins have a sizing selected so as to maintain a spacing, between the innermost pin ends which are proximate to each other. The spacing in between the, inner ends of the pins …
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 11, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 11, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 11, 2025.
- 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.