praseo, still disagree with Your video prove. Better see here:
Title:
Refractory article and its use
European Patent EP0210458
Kind Code:
B1
Abstract:
Abstract not available for EP0210458
Abstract of corresponding document: US4775648
Heavy ceramic shaped material with a content of at least one of the components magnesia, fired dolomite, chromite and spinel, characterized by a microcrack system substantially homogeneously distributed in the shaped material structure, as well as process for producing such a heavy ceramic shaped material and the use thereof.
Inventors:
Weibel, Dipl. Guido -Ing (Kleine Strasse, Dankelshausen, D-3515, DE)
Bartha, Dr. P. (Greifswalderstrasse 2, Bovenden, D-3406, DE)
Application Number:
EP19860109006
Publication Date:
12/23/1992
Filing Date:
07/02/1986
Export Citation:
Click for automatic bibliography generation
Assignee:
Refratechnik GmbH (Rudolf-Winkel-Strasse 1, Göttingen, D-37079, DE)
Within the patent describing use of said bricks it is clearly mentioned that the big advantage is, that You don't need mortar anymore. Believe me I definetily know they don't suggest to use mortar and it saves time and money.
I am living in Göttingen and have very close relations to the worldwide operating company Refratechnik. After 20 years a patent is free to be used by competitors, what else should they do but staying with old technology if not asking for a license.
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