Percussive drilling tool
CA 1097331 A · Owner: Torque Tension Limited · Inventors: Foster, Bruce A.; Taylor, Dennis M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A percussive drilling tool comprises a chuck for holding a drill steel of a drilling bit a hydraulic motor, mechanically coupled to the chuck for rotating it a hydraul-, ically-operated reciprocating mechanism for striking the drill steel either directly or indirectly in a direction which is substantially parallel to the axis of the chuck when the drill steel is held by the chuck and a flow, control valve, the tool being such that fluid at pressure entering the tool is divided between the hydraulic motor which has priority, and the fluid flow through which is controlled in consequence of the provision of said valve and the, reciprocating mechanism which receives the remainder of the fluid …
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 March 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 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.