RICH, Judge.
This appeal is from the rejection of claims 12-17 of appellants' application Ser. No. 324,423, filed December 5, 1952, for "Use of Polyvinylpyrrolidone as a Soil-Suspending Agent." That agent will hereinafter be called "PVP." Claim 18 alone has been allowed, as a result of the board's reversal of its rejection.
The specification explains the invention and its background as follows:
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