Curbs on business-method claim【主语】// would be //【谓语动词】//a dramatic about-face 【表语】//because it was the Federal Circuit itself that introduced such patent with its 1998 decision in the so- called State Street Bank case, approving a patent on a way of pooling mutual-fund assets【原因状语从句】.
解答:approving a patent on a way of pooling mutual-fund assets.现在分词作结果状语成分
句子整体框架结构是“Curbs+定语+would be a dramatic about-face +because原因状语从句+it was +名词短语+that强调句型”
【1】主句:Curbs on business-method claim would be a dramatic about-face (主谓表结构)
【2】从句:because it was the Federal Circuit itself that introduced such patent with its 1998 decision in the so- called State Street Bank case, approving a patent on a way of pooling mutual-fund assets.(原因状语从句)
备注:原因状语从句里嵌套一个“It was+名词短语+that ”强调句型,强调句型是“强调句子主语成分”和一个现在分词作结果状语。