BLAND, Associate Judge.
The Primary Examiner of the United States Patent Office rejected all the appealed claims in the appellant's application for the reissue of a patent No. 1,788,569 of January 13, 1931, relating to refining viscous mineral oils. The first eighteen claims of the patent stand allowed in the application. Upon appeal to the Board of Appeals, the decision of the Examiner was affirmed upon substantially the same grounds as those assigned by the Examiner...
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