JACKSON, 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 Primary Examiner which rejected all of the claims, 2 to 18, inclusive, 22, and 23, of an application for a patent on "a fluorescent petroleum lubricating oil."
Claims 2 and 23 are illustrative. They read:
"2. A fluorescent petroleum lubricating oil comprising petroleum hydrocarbons containing a small proportion...
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