VAN ORSDEL, Associate Justice.
Appellant, Clark, appeals from the decision of the Commissioner of Patents, denying the patentability of claims 11 to 28, for an invention relating to paving or flooring composed of rubber. Claims 11 and 20 illustrate the invention in issue, and read as follows:
11. "A paving or flooring element, composed of rubber, having a continuous upper surface and projections on its lower surface for engagement with a support; said projections...
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