This is an action under R.S. § 4915, 35 U.S.C.A. § 63, in which the plaintiff seeks to have the Court authorize the allowance of certain claims to a refractory product and method of making it.
The specification of the Yoshiki application on which the claims in issue are based reads as follows:
"The usual batch for elector-melting for casting refractories is a mixture of aluminous and siliceous substances containing 1% or over of alkali. As the melt cools, mullite and corundum crystallize out of the melt, with an increase of the alkali content in the still liquid phase which finally solidifies as a glass between the crystals. I find that by reducing the alkali content of the melt to 0.1% or under, and adding magnesia, the amount of glass is greatly reduced, and the space between the corundum and mullite crystals becomes filled with crystals of cordierite (2MgO, 2A l O, 5SiO) which act as a binder therefor.
"The following are example batch compositions which may be employed --
Alumina 65% 70%
Silica 28 25
Magnesia 7 5
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