Application of Irvin D. Johnson

ALMOND, Judge.

This is an appeal from the decision of the Patent Office Board of Appeals, adhered to on reconsideration, affirming the rejection of claims 1-5 and 7-11 of appellant’s application entitled “Refractometer.” 1 No claims were allowed.

The invention relates to a refractometer capable of emitting an electrical signal indicative of the refractive index of the fluid being tested. The refractometer, which consists of three principal elements: a source of illumination, a hollow prism, and a photopotentiometer, is shown in Fig. 1:

The refractive index of a fluid flowing through pipe 11 may…