The U.S. Supreme Court on Monday denied RPost Communications Ltd.'s petition in a patent case against GoDaddy.com in which RPost had asked the justices to rule against a patent ineligibility defense that has become quite popular under the high court's Alice ruling.

In declining to hear the case, the Supreme Court upheld a Federal Circuit decision in May affirming a lower court ruling that invalidated six of RPost's electronic messaging patents for claiming only abstract ideas about collecting information.

RPost appealed the ruling last month, reiterating earlier arguments that patent ineligibility under Section 101 of the Patent Act was not one of the limited number of defenses that Congress authorized in patent litigation.

RPost's patents describe a way of tracking and confirming delivery of email. GoDaddy filed suit in Arizona federal court in January 2014 after receiving letters from RPost claiming some of its email products might be infringing. GoDaddy sought a court order that each of the six patents was invalid and that the company did not infringe.

Counsel of record for GoDaddy is Burt M. Rublin of Ballard Spahr LLP. It was represented at the Federal Circuit by Brian W. LaCorte, Jonathon A. Talcott, Kimberly A. Warshawsky and Jessica A. Wilson of Ballard Spahr LLP.

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