A drill bit and method for producing a drill bit
CA 2494062 C · Owner: Ellis, Liam Patrick · Inventors: Ellis, Liam Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drill bit comprising: a shaft (103) which has a pyramidal shaped end (105) defining a drill tip with a plurality of edges defining the pyramidal shape; and one or more recesses (107) for directing away debris produced whilst drilling, the or each recess (107) having a first portion (109) extending along the shaft (103) and a second portion (111) which extends along the drill tip, wherein the second portion (111) of the or each recess (107) extends along an edge (113) of the drill tip.
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 August 7, 2003 and granted June 14, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 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.