GARRETT, Chief Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the final rejection of all the claims of appellants' application for patent, serial number 483,338.
The claims are numbered 1, 3, 4, 5, 6, 9, 10, and 12 to 25, inclusive.
Claim 21 is the only product claim. It reads: "21. As a new composition of matter, polydihydropyran."
It was quoted by the board as representative...
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