Prestressed elastic arched mine roof support
CA 1090596 A · Owner: Kelley, Jay H. · Inventors: Kelley, Jay H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An arched roof support for a mine opening essentially includes an elastic plate member with a preselected curvature across its length employed for establishing a prestressed emplacement into a load-bearing contact along the middle portion of the roof stratum of the mine opening. The material forming the plate member is selected for withstanding an elastic deformation force to maintain the prestressed emplacement which is effected by the elevated support of one or both sides of the plate member along or toward side ribs of the mine opening. As anchoring means the side edges of the plate member are either supported solely by the ribs of the mine opening or additional support is supplied by …
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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 2, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 2, 1997.
- 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.