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eBay Inc., et al. v. MercExchange LLC

By Anthony J. Fitzpatrick
June 28, 2006

The Supreme Court's May 15 decision in eBay Inc., et al. v. MercExchange LLC (eBay) is already a landmark in patent law. The unanimous Court rejected the general rule, previously applied by the Court of Appeals for the Federal Circuit, that a permanent injunction will issue against patent infringement absent exceptional circumstances. Instead, the Supreme Court held that, consistent with the 'long tradition of equity practice,' a patent holder must satisfy a four-prong test:

  1. That it has suffered irreparable injury;
  2. That remedies available at law, such as monetary damages, are inadequate to compensate for that injury;
  3. That, considering the balance of hardships between the patent holder and patent infringer, a remedy in equity is warranted; and
  4. That the public interest would not be disserved by a permanent injunction.

The eBay decision will likely have a significant impact on patent licensing and patent litigation, because the patent holder no longer can assert the significant threat of essentially automatic injunctive relief upon a finding of infringement. Indeed, the first ruling from a trial court employing the eBay framework shows that the decision may lead to surprising results. On June 14, Microsoft persuaded a district court to deny an injunction in a case where Microsoft had been held liable for willful infringement of patents owned by a small software company.

What Happened in eBay?

MercExchange LLC, a patent-holding company, sued eBay Inc. and its subsidiary Half.com Inc., alleging infringement of three business-method patents, including U.S. Patent No. 5,845,265, which is directed to facilitating the electronic sale of goods between private individuals by establishing a central authority to promote trust among participants. A jury found the '265 patent valid and infringed, but the district judge denied MercExchange's request for a permanent injunction, finding that MercExchange did not face irreparable harm from eBay's continuing infringement because it did not practice the inventions itself, and it had shown a willingness to license the patents to others. On appeal, the Federal Circuit affirmed the jury verdict. But the Federal Circuit reversed the district court's denial of a permanent injunction, concluding that the case was not 'sufficiently exceptional to justify the denial of a permanent injunction.'

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