ATT v. Excel ruling by US CAFC on 14 April 1999
AT&T Corp. v. Excel Communications Inc.
Thus, the Alappat inquiry simply requires an examination of the contested claims to see if the claimed subject matter as a whole is a disembodied mathematical concept representing nothing more than a "law of nature" or an "abstract idea," or if the mathematical concept has been reduced to some practical application rendering it "useful."
 Related pages on en.swpat.org
- The ruling: http://www.ll.georgetown.edu/FEDERAL/judicial/fed/opinions/98opinions/98-1338.html
- AT&T Corp. v. Excel Communications Inc., Wikipedia
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