A thread joint for a drill string for percussive rock-drilling
CA 2484540 C · Owner: Ericson, Johan · Inventors: Ericson, Johan; Wahlstroem, Patrik
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a screw joint for a drill run or drill string for percussion rock drilling comprising male and female screw threads on the elements to be joined together to form a drill string. According to the invention the male thread and the female thread have a trapezoidal shape and a slight conical inclination.
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 May 9, 2003 and granted April 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2025.
- 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.