Lance with metered core for treating molten metal
CA 2001916 A1 · Owner: Perri, Joseph A. · Inventors: Perri, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lance for use in treating a bath of molten metal has an elongated refractory body with a metal tube positioned axle thereof so as to extend out of a first end portion and terminate inwardly of a second end portion thereof a plurality, of smaller metal tubes arranged in a circular pattern communicating with said metal tube are positioned in said second end portion and extend therefrom to the exterior thereof which defines the delivery end of said lance, means engaging said first mentioned metal tube extends outwardly of the first end portion by which said lance may be supported, the plurality of smaller metal tubes being surrounded by said refractory body forming a coating thereover of a …
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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 October 31, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 31, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2011.
- 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.