Rock drill bit
CA 1064014 A · Owner: Skf Industrial Trading And Development Company B.V. · Inventors: Johansson, Carl E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rock drill bit is provided with a fluid seal for the cutter bearing. The bit has a bit segment on which an annular outer bearing race is removably mounted. The bearing race carries a rotary cutter with a hub projecting into the center of the race and an inside surface overlying the outer surface of the race to provide a narrow gap. The gap and thus the bearing is sealed by a pressurized fluid flowing through ducts in the bit into the gap, and out of its open end to flush away any fine cuttings.
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 October 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 9, 1996.
- 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.