Improvements in or relating to the manufacture of extrusion dies
CA 2334667 A1 · Owner: Feldcamp, Edward George · Inventors: Feldcamp, Edward George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An extension die comprises a zero bearing die cavity (12) having a shape corresponding to the cross-sectional shape of the required extrusion. In order to control flow of the extrusion material through the cavity a preform , chamber (17) is provided which communicates with the die cavity but is of greater area. The depth and/or width of the preform chamber varies in different regions thereof, the dimensions of each region being related to the dimensions and position of the corresponding region of the die cavity (12). In use, extrusion material passes through different regions of the preform chamber at different velocities, such that the material subsequently passes through all …
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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
- Filed June 8, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2021.
- 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.