Mine roof supports
CA 1111265 A · Owner: Fletcher Sutcliffe Wild Limited · Inventors: Wake, Malcolm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mine roof support comprises a plurality of chock legs, each being mounted at its lower end in a base means of the support, with co-operating and contacting convex/concave surfaces on the chock leg and base means respectively, and the chock leg being provided at a distance spaced upwardly from the contacting surfaces with an exterior abutment attached to a spacer tube extending from, and attached to the, end cap of the chock leg remote from the contacting convex/concave surfaces, the base means providing a co-operating abutment such that contact between the two abutments prevents withdrawal of the chock leg from the base means.
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 October 27, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 27, 1998.
- 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.