Rotary drill bits and cutting elements for such bits
CA 1237121 A · Owner: Nl Petroleum Products Limited · Inventors: Wardley, Michael T.; Barr, John D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A T I O N, "Rotary Drill Bits and Cutting Elements for such Bits" ABSTRACT OF THE DISCLOSURE, A cutting element for a rotary drill bit comprises a thin hard facing layer, defining a front cutting face, bonded to a less hard backing layer. The backing layer is of non-uniform thickness for, example is wedge-shaped, and is thicker adjacent the cutting edge of the facing layer than it is over the rest of the area of the facing layer. The rear surface of the backing layer of the cutting element is bonded to a surface on a carrier which is mounted in the bit body. The backing layer of the cutting element may be formed in two portions: a front portion which is bonded to the hard facing layer and a …
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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 May 24, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 24, 2005.
- 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.