Continuous extrusion apparatus
CA 2032480 C · Owner: Bwe Limited · Inventors: Anderson, Douglas Edward; Hawkes, Daniel John; Jones, Phillip Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for the continuous extrusion of metals in which feed is introduced into two (or more) spaced mart circumferential grooves (4) in a rotating wheel (2) (or rotating wheels) to contact an arcuate shoe portion (8) and abutments extending into the grooves. The feed is constrained by the abutments to flow through frusto-conical exit apertures (10) in the shoe portion (8) to a chamber (6) and is extruded as relatively thin-walled large, cross-section, product. The exit apertures (10) have cone angles in the range 5°-45°. Mixer plates (14) are profiled to distribute flow evenly from the ap-, ertures ( 10) to around the die opening (30). An extrusion die body (18) for cylindrical …
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 May 18, 1990 and granted June 19, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2012.
- 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.