Drilling tool with shock dampers
CA 2223728 A1 · Owner: Delwiche, Robert · Inventors: Besson, Alain; Lecour, Pierre; Delwiche, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a drilling tool comprising a drilling head with cutting edges. The drilling tool also has several damping components (28) of which at least part consists of elastomeric material. Each damping component consists of a stud (28) comprised of a portion inserted into a receiving recess (36) on the surface of the tool and a portion protruding from the said recess.
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 December 23, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2019.
- 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.