Microsoft Corp. v. i4i Ltd. Partnership

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Microsoft Corp. v. i4i Ltd. Partnership
Argued April 18, 2011
Decided June 9, 2011
Full case nameMicrosoft Corp. v. i4i Ltd. Partnership
Docket no.10-290
Citations564 U.S. 91 (more)
131 S. Ct. 2238; 180 L. Ed. 2d 131; 2011 U.S. LEXIS 4376; 79 U.S.L.W. 4454; 98 U.S.P.Q.2d 1857
Court membership
Chief Justice
John Roberts
Associate Justices
Antonin Scalia · Anthony Kennedy
Clarence Thomas · Ruth Bader Ginsburg
Stephen Breyer · Samuel Alito
Sonia Sotomayor · Elena Kagan
Case opinions
MajoritySotomayor, joined by Scalia, Kennedy, Ginsburg, Breyer, Alito, Kagan
ConcurrenceBreyer, joined by Scalia, Alito
ConcurrenceThomas (in judgment)
Roberts took no part in the consideration or decision of the case.

Microsoft Corp. v. i4i Ltd. Partnership, 564 U.S. 91 (2011), was a case decided by the Supreme Court of the United States. Under 35 U.S.C. § 282, a patent is entitled to a presumption of validity in court. In i4i, the Court held that when a court reviews the validity of a patent, the presumption may only be overcome based on clear and convincing evidence.[1]

The case was a patent dispute between i4i Ltd. Partnership and Microsoft: i4i charged that Microsoft Word infringed on i4i's patent; Microsoft argued that the clear and convincing evidence standard applied by the Federal Circuit was inappropriate and that a preponderance of the evidence standard should be applied. The Court rejected Microsoft's position.[2]


  1. ^ Microsoft Corp. v. i4i Ltd. Partnership, 564 U.S. 91 (2011).
  2. ^ Liptak, Adam (June 10, 2011). "Microsoft Loses Appeal in i4i Patent Case". The New York Times. Retrieved July 3, 2018.

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