Application of Frank A. Rice and Elias W. Wilson

MARTIN, Judge.

The question the court must answer in this appeal is whether appellants’ novel air cleaner, as represented by claims 1, 2 and 3 of their application serial No. 816,556 entitled “Air Cleaner” filed on May 28, 1959, is an obvious variation of the devices of the prior art. No claims stand allowed in the application, which is stated to be a continuation-in-part of application serial No. 698,474 filed November 25, 1957 for an “air cleaner device.”

The centrifugal air cleaner appellants disclose is useful on internal combustion engines or air-compressors, particularly under very dusty…