Method for producing a tungsten carbide tip punch
CA 1278709 C · Owner: Peng, Da H. · Inventors: Peng, Da H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is used for producing a tungsten carbide tip punch which includes a punch rod and a tungsten carbide piece of a hardness greater than that of the punch rod. A crownlike indentation is formed in the bottom surface of the tungsten carbide piece. A brazing material is applied to the vertices of the crown-like indentation and around the interengaging surfaces of the punch rod and the tungsten carbide piece. The cylindrical protrusion of the top surface of the punch rod is pushed into the crown-like indentation of the tungsten carbide piece by a hydraulic activating apparatus so that the top of the cylindrical protrusion is formed along, the vertices, into a crown-like shape to join the …
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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 January 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 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.