Drill rod and method in order to manufacture the same
CA 2498385 C · Owner: Hedlund, Ann-Cathrin · Inventors: Larsson, Kenneth; Hedlund, Ann-Cathrin
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 drill rod for percussive rock drilling and a method in order to manufacture the drill rod. The drill rod (10) has a first rod part (11) comprising a free end (11A) an opposite end (11 B), an inner , duct (14) and an externally threaded part (15) near the free end the , externally threaded part being entirely or partly hardened by heat treatment and an additional rod part (13) comprising a free end (13A) an opposite end , (13B), an inner duct (17) and an internally threaded part (18) near the free end (13A) of the second rod part, the internally threaded part (18) being entirely or partly hardened by heat treatment. The opposite ends (11B,13B) of the …
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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
- Filed September 22, 2003 and granted January 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 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.