Rock drill bit and method for its manufacturing
CA 2397146 A1 · Owner: Asberg, Bengt · Inventors: Ederyd, Bertil; Larsson, Kenneth; Asberg, Bengt
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 rock drill bit (1) for percussive drilling especially top hammer drilling. The rock drill bit (1) comprises a bit head (3) provided with rock crushing means (11) and a skirt (5). The drill bit (1) , is provided with a number of grooves (16) for drill cuttings on the outside of the skirt (5) which extend in the axial direction of the drill bit (1). Protruding lands (17) are defined between the grooves (16) for drill cuttings which likewise extend in the axial direction of the drill bit (1). The drill bit (1) has means (9) for connecting the drill bit (1) to a drill rod (7). At least some of the ends of the lands (17) facing away from the rock-crushing …
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 February 20, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 20, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2023.
- 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.