AT&T Corp. v. Excel Communications, Inc., Excel Communications Marketing, Inc., and Excel Telecommunications, Inc.

How courts have described this case

Verbatim parenthetical descriptions written by other courts when citing this decision. Ranked by citation-network relevance.

• holding that a mathematical algorithm must produce “a useful, concrete, and tangible result” to be patentable
• holding that a mathematical algorithm must produce “a useful, concrete, and tangible result” to be patentable
• holding patentable \a process that uses the Boolean principle in order to determine the value of the PIC indicator” and that \require[d] the use of switches and computers”
• holding patentable \a process that uses the Boolean principle in order to determine the value of the PIC indicator” and that \require[d] the use of switches and computers”
• holding patentable “a process that uses the Boolean principle in order to determine the value of the PIC indicator” and that “require[d] the use of switches and computers”
• holding patentable a method for determining whether long-distance calls were being made between long-distance carriers or within a single long-distance carrier that used a mathematical algorithm and “require[d] the use of switches and computers”

Source: CourtListener parenthetical corpus (CC0).