ROBB, Associate Justice.
Appeal from Patent Office decision refusing claims 1, 2, and 4 to 18, inclusive, of appellant's application, dated February 12, 1923, for a reissue of patent No. 1,421,084, granted June 27, 1922, on an electric heating element comprising a refractory core with a plurality of spirally arranged grooves, in the nature of multiple screw threads, formed on its outer surface. A single coil passes from one end of the core along a groove to the opposite...
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