Closure and/or control element for a metallurgical vessel
CA 2027767 A1 · Owner: Schuler, Andreas · Inventors: Hintzen, Ullrich; Schuler, Andreas; Luhrsen, Ernst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a closure and/or control element an inner tube (2) has lateral openings (4). An outer tube (5) also has lateral openings (8) and seats with a cylindrical sealing surface (7) against a cylindrical sealing surface (6) on the inner tube (2). In order to flush the sealing surfaces (6,7) and the opening (8;4,8) with inert gas, the inner tube (2) is provided at its top with a closure (3), whereby a gas distribution chamber (9) is formed. Inert gas introduced into the gas distribution chamber (9) flows between the sealing surfaces (6,7) and through the openings (8;4,8). (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 October 16, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 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.