LENROOT, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office, affirming a decision of the Examiner, rejecting for lack of invention over the prior art claims 6 and 8 to 12, inclusive, of appellant's application.
Claim 6 is illustrative of the claims in issue and reads as follows: "6. The herein described method of extracting oil from oil sands, consisting in generating steam to a desired pressure, superheating...
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