A process and an apparatus for the vacuum processing of metals
CA 2009923 C · Owner: Mannesmann Aktiengesellschaft · Inventors: Dittrich, Rainer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the vacuum processing of metals in, particular steel, in which molten metal is located in a vacuum processing vessel that is closed off by means of a cover. The surface of the liquid metal is separated into a circular sector and an enclosing annular sector. The liquid metal is exposed to various partial vacuums at its surface. The annular sector is acted upon by a smaller partial vacuum than the circular sector and the separation of the sectors is undertaken in the annular sector to a submersion depth into the melting bath between 10-20 cm. In addition, there is provided apparatus for vacuum processing of metals comprising a skirt that is of simple design and, relatively …
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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 February 13, 1990 and granted September 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 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
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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.