Metal casting apparatus
CA 2033009 C · Owner: O'Sullivan, Denis · Inventors: O'Sullivan, Denis; Brown, Charles Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Metal casting apparatus comprises a casting container having an outlet nozzle in the bottom wall thereof and an, upright stopper within the container having a lower nose end thereto, the stopper being selectively movable between an operative position in which the nose end thereof seats on to, close, the nozzle and an inoperative position in which said nose end is displaced from, to open, the nozzle. The apparatus further comprises a barrier member positioned between the nose end of the stopper and the outlet nozzle and of a refractory material such as ceramic fibre capable of withstanding temperatures associated with pre- and postheating of the apparatus but which is combustible at …
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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 December 21, 1990 and granted July 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.