EDGERTON, Associate Justice.
These appeals are from judgments of the District Court under R.S. § 4915, 35 U.S.C.A. § 63, refusing, for lack of invention, to authorize the issue of patents.
One group of claims relates to a process of drilling a well by employing as a drilling fluid a molten asphalt or sulphurous material of widely variable viscosity, instead of the conventional clay and water. Heating coils, attached to the drilling system, make possible...
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