Earth boring drill bit with improved wear inserts
CA 2049903 A1 · Owner: Hughes Tool Company · Inventors: Scott, Danny E.; Jurewicz, Stephen R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved insert is shown for use in a rotary rock bit of the type adapted to be made up in a drill string extending from the surface of the earth down a borehole. The improved insert is formed of a diamond impregnated carbide containing dispersed diamond crystals, the crystals being formed via the in-situ conversion of graphite to diamond.
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 26, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2013.
- 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.