Cutting elements for rotary drill bits
CA 1311744 C · Owner: Bex, Phillip · Inventors: Taylor, Malcolm R.; Bex, Phillip; Gasan, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A preform cutting element 10 for a rotary, drill bit, includes a layer 12 of polycrystalline diamond material having a front cutting face 15 a rear, face 16 and a peripheral surface 17 a cutting edge 18, being provided by at least part of the junction between the front cutting face and the peripheral surface. The diamond layer is formed around its periphery adjacent, the cutting edge, with a row of spaced apertures. Each aperture is in the form of a bore 19, formed for example by a laser, which is inclined at 45°to the cutting face 15 and extends completely through the diamond layer from the cutting face 15 to the peripheral surface 17 thereof. The apertures serve to inhibit the propagation …
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 December 22, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 2009.
- 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.