October Term 2020 · Docket 20-440

Can a patent seller challenge the validity of the patent they sold?

Minerva Surgical argues the Federal Circuit wrongly bars sellers from challenging patents. Hologic argues the law requires sellers to stand by their prior representations.

Official caption
Minerva Surgical, Inc. v. Hologic, Inc.
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Verified source milestones

  1. — An official oral-argument transcript was verified.
  2. — An official oral-argument transcript was verified.
  3. — An official Court opinion was verified.

The arguments, in order

This case may have been argued more than once. Each entry below uses that session's official transcript. Later arguments do not erase earlier ones.

  1. Argument 1 ·

    What happened at the argument

    Minerva argues the Federal Circuit test is too broad.

    Hologic argues the doctrine has long-standing precedent.

    Justice Breyer noted many briefs suggest limiting, not abolishing, the doctrine.

    Read the official transcript for this argument · Official argument details

    Sources used for this argument breakdown

A citizen's guide to the whole case

What this case is about

This case tests the scope of assignor estoppel. Minerva wants to invalidate a patent it sold. Hologic wants to keep that patent enforceable against its former owner.

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How the case got here

The Supreme Court heard oral argument in this case on April 21, 2021.

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What each side wants

Minerva wants to invalidate the patent it sold.

Hologic wants to enforce the patent against Minerva.

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What each side says

Minerva argues the Patent Act does not create assignor estoppel.

Hologic argues Congress intended assignor estoppel in 1924.

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What the justices asked

Justice Sotomayor asked if the issue is now validity rather than claim construction.

Justice Alito asked if parties can contract around assignor estoppel.

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Why it matters

This dispute defines who can challenge patent validity. It affects the stability of patent markets. It determines the rights of former patent owners.

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What happens next

This article currently covers the argument record. Use the official docket link for later case activity.

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Official Court provenance

Official docket and case history · Official Supreme Court oral-argument detail page

Verified official opinions and orders

Title and summary sources

Revision history

  1. Revision 1 · Post Opinion ·

    Correction: Rewritten to the concise citizen-facing editorial standard.

  2. Revision 2 · Post Opinion ·

    Correction: Migrated to the dated official Court activity contract without model use.

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