Gas flushing brick
CA 2041925 A1 · Owner: Kopia, Jochen · Inventors: Rothfuss, Hans; Metzger, Herbert; Kopia, Jochen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Gas Flushing Brick, The effective gas flow cross-section of a gas flushing brick (1) for a metallurgical vessel is to be matchable to different desired gas throughput volumes. For this purpose, the gas permeable region of the gas flushing brick (1) is divided into at least two gas permeable regions (3,4). Each of the regions (3,4) is connected at the lower surface (5) of the gas flushing brick (1) to an individual gas connection (10,12;11,13) and extends to the upper surface (6) of the gas flushing brick (1). (Figure 1)
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 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2013.
- 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.