Mounting means for cutting elements in drag type rotary drill bit
CA 1280405 C · Owner: Daly, Jeffery E. · Inventors: Daly, Jeffery E.; Schumacher, Percy W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A drag type rotary drill bit (10) having mounted on its lower face (22) a rigid integral holder (30) for a plurality of polycrystalline diamond compact (PDC) cutting elements (42) secured to a planar face (60) of the holder (30). An upper projecting tapered end portion (71) of the holder (30) defines tapered surfaces (72 73) with the, lower tapered surface (72) extending at a relatively large clearance angle (B) to provide a relatively small wear flat surface on the holder (30).
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 February 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 2008.
- 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.