Injection molding torpedo with shaft having ceramic central portion
CA 2093588 C · Owner: Gellert, Jobst Ulrich · Inventors: Gellert, Jobst Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Injection molding apparatus wherein a torpedo is mounted in the front end of a heated nozzle. The torpedo has spaced blades extending inwardly from an outer collar to an elongated shaft which extends centrally in the melt bore. The torpedo shaft has an elongated central portion which is securely press fitted in a steel outer sleeve from which the blades extend. The elongated central portion of the torpedo shaft extends forwardly into the gate and is, formed of an engineered ceramic such as silicon carbide which is very thermally conductive as well as abrasion and corrosion resistant. In one embodiment the gate extends, through a gate insert which is also formed of a thermally conductive and …
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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 April 7, 1993 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 7, 2015.
- 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.