Method and apparatus for breaking hard compact material such as rock
CA 1077014 A · Owner: Institut Cerac Sa · Inventors: Cooper, George A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of breaking hard compact material such as rock adjacent a hole drilled thereinto and an apparatus for performing the method are described. Two forces contribute to efficiently breaking the rock: a force for firmly gripping a region of material adjacent the hole and an axial outwardly directed force. When breaking the material the force for firmly gripping the material is unidirectional with but separate from the axial outwardly directed force. To generate these forces wedge means and sleeve means of the apparatus are inserted into the hole and an axial outwardly directed thrust is exerted on the sleeve means. This is enabled by cooperating sliding wedge surfaces of the wedge means …
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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 May 6, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 6, 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.