Use of a tungsten/heavy metal alloy
CA 2365366 A1 · Owner: Resch, Joachim · Inventors: Dreer, Norbert; Grill, Robert; Resch, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the use of a tungsten/heavy metal alloy for tools such as extrusion dies and extrusion mandrels for the hot-forming of copper and copper alloys. The alloy consists of 80 to 89.9% by weight of tungsten, 2 to 7% by weight of chromium, remainder binder metal. The use of this alloy primarily results in a considerably reduced formation of grooves on the surface of the forming tools.
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
- Filed December 18, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 18, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2023.
- 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.