In re Christmann

This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming that of the examiner denying patentability in view of prior art cited of all the claims, numbered 1 to 8, inclusive, in an application for patent bearing the title “For Reaction Products of Organic Bases and Hydrofluosilicic Acid.”

Claim 1, which is generic in the class of claims before us, reads as follows:

1. An insecticidal composition including a reaction product of hydrofluo-silicic acid and a guanidine.

In each of the other claims a specific kind of guanidine is named. It seems to be…