In re Budnick

MILLER, Judge.

This appeal is from the decision of the Patent and Trademark Office Board of Appeals affirming the rejection of claims 25 through 28 of application serial No. 813,385, filed February 28, 1969, for “Chelation.”1 We affirm.

The Invention

Claimed are hydroxymethane diphosphonic acid and alkali metal and ammonium salts, thereof, having the following formula:

wherein Ri, R2, R3, and R4 are selected from the group consisting of hydrogen, alkali metal (e. g., sodium potassium, etc.), and ammonium. These compounds are useful as chelating or sequestering agents. Claim 25 is illustrative:

25.…