Vortex dispersing nozzle for liquified cryogenic inert gases used in blanketing of molten metals exposed to ambient air
CA 2128802 C · Owner: Air Products And Chemicals, Inc. · Inventors: Berger, Kerry Renard; Swan, Robert Bruce; Zurecki, Zbigniew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for dispersing cryogenic inert gases over the surface of a bath of molten metal by separating vaporized cryogenic gas from the liquid phase of the gas and introducing the liquid phase and the gaseous phase onto the surface of the molten metal in a swirling pattern. Additional inert gas can be introduced into the middle of the liquid phase.
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 July 26, 1994 and granted July 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 26, 2016.
- 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.