Controlling teeming streams
CA 2015924 C · Owner: British Steel Limited · Inventors: Scholes, Alan; Widdowson, Roy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for constraining the flow of molten metal from a tundish to a mould along the inner periphery of a tube mounted between them. A vertically movable stopper rod is seated at its lower end in a nozzle at the entrance to the tube the end being so designed as to cause an annular discharge of metal into the tube upon the stopper rod lifting from its seating, gas being infected through the stopper whereby to generate a gaseous void within the interior of the tube to promote the maintenance of the metal flow path of along the length of the inner periphery of the tube.
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 2, 1990 and granted September 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 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.