Rock drilling device
CA 2076409 C · Owner: Rodert, Jorgen · Inventors: Andersson, Kurt; Rodert, Jorgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Rock drilling device comprising a drilling tool with a set of tubes (7) and a set of rods (9) arranged therein. The drilling tool comprises a number of sections which each comprises a tube (7) a rod, (9) and an end piece (11). The rod is provided with projections (10) at least near one of its ends for cooperation with parts (13,14) with reduced diameter in the tube and end piece respectively. The part (13) in the tube limits the movement of the rod in a direction away from the end piece. The part (14) in the end piece limits the movement of the rod in a direction towards the end piece. All thread connections (12) between different sections of the drilling tool and between tube and end piece …
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 20, 1992 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2014.
- 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.