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Patent Infringement Letters: Key Considerations and Best Practices for Senders and Recipients

Implications of Recent Court Treatment, Leveraging Letters, Response Strategies for Alleged Infringers

Recording of a 90-minute premium CLE video webinar with Q&A

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Conducted on Tuesday, October 3, 2023

Recorded event now available

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This CLE course will guide patent counsel on the use of patent infringement demand letters. The panel will discuss considerations and strategies for both the sender and recipient. The panel will offer best practices for determining whether and when to send a letter and responding to an infringement letter.


After identifying potential infringers, patent holders must weigh their options regarding their next steps: Litigation? Do nothing? Many choose to send an infringement demand letter, which puts the recipient on notice of the alleged infringement and demands the cessation of infringing activity. However, patent owners must carefully craft such notices to balance achieving their goals in sending the letter against the risk of a declaratory judgment action.

The Federal Circuit's decision in Jack Henry & Assoc. v. Plano Encryption Tech. (Fed. Cir. 2018) warned patentholders that sending demand letters into a jurisdiction may subject them to venue and personal jurisdiction in the recipient's location. In light of this precedent and the changing landscape around venue for patent infringement actions, patentholders should carefully consider their goals in sending an infringement demand letter and how to balance achieving those goals against declaratory judgment risks.

Recipients of these demand letters must evaluate what course of action to take. Recipients should consider whether they are infringing the patent in question. They must determine who the sender is and the potential ramifications for business interruption, litigation, or a license agreement. How should they respond to the letter to minimize the risk of actual damages, injunctive relief, or even a finding of willful infringement?

Both patentholders and recipients of infringement demand letters must carefully consider their approaches to patent infringement letters, assessing the risks and evaluating the impact of their actions.

Listen as our authoritative panel of patent attorneys examines patent infringement demand letters, discussing the considerations and strategies for both the sender and recipient. The panel will offer best practices for determining whether and when to send a letter and responding to an infringement letter.



  1. Patent owner considerations
    1. Potential DJ action
    2. Litigation--where and when to file
  2. Patent owner strategies
    1. Careful drafting to avoid DJ action
    2. Timing
  3. The recipient of an infringement letter issues
    1. Is the sender a competitor?
    2. Are you infringing?
    3. Business interruption
    4. Litigation
  4. Infringement letter recipient strategies
    1. Defenses
    2. Litigation
    3. Opinion of counsel
    4. Response
  5. Best practices


The panel will review these and other noteworthy questions:

  • What factors should patent owners consider before sending such a letter?
  • How can the language of the letter manage the risk of a DJ action while achieving the letter’s goals?
  • How do the contents of an infringement demand letter help counsel evaluate the risk and create an appropriate response?
  • What steps should counsel take to minimize the risk of actual damages and/or injunctive relief?


Brunette, Nathan
Nathan C. Brunette

Stoel Rives

Mr. Brunette focuses his practice on patent and IP litigation as well as complex business disputes. He has represented...  |  Read More

Williams, Elliott
Elliott Williams

Stoel Rives

As an intellectual property attorney, Mr. Williams helps companies protect market share for innovative products and...  |  Read More

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