Canadian Patent Scaffolding Co. v. Delzotto Enterprises Ltd.
(1980), 47 C.P.R. (2d) 77 (F.C.A. per Kelly D.J, Pratte & Ryan JJ.A. concurring)
copyright 2006 Donald M. Cameron
At p. 81:
Where the specified material has some quality not present in other available materials which quality leads to a new and useful result not attainable by the use of other materials the claim for the use of that material may be a valid one.
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