Forming of extrusion dies
CA 1208044 A · Owner: Hobson Limited · Inventors: Nicholson, George R.; Stewart, David E.
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, "Improvements in or Relating to the Forming of Extrusion Dies", ABSTRACT OF THE DISCLOSURE A method of forming an extrusion die, comprises forming an extrusion aperture in a die piece forcing a flowable material partly through the extrusion aperture so that the leading surface of the material becomes deformed in the extrusion direction and then removing the exposed surface of the extrusion aperture, by chemical or electro-etching so that the, effective axial bearing depth of the extrusion aperture at any location around its periphery corresponds to the deformation of the leading surface of the flowable material at that location. The axial bearing depth of the completed die at any …
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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 July 22, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 22, 2003.
- 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.