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THE GO-TO FIRM FOR DEFENDANTS IN PATENT LITIGATION

Patent Defenses is a unique legal research tool for businesses and individuals to find information about possible defenses to utility patent infringement claims under U.S. law. It is shared with the patent community in the Klarquist spirit of teamwork, integrity, excellence, and generosity.

The search bar can be used to search Patent Defenses for a keyword or phrase. For example, search “double patenting,” “exhaustion,” or “Princo” (or other case name).


WAYS TO USE PATENT DEFENSES

  • Search for a specific term or keyword
  • Browse topics of interest
  • Explore “Recent Case Highlights”
  • Read more

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Redacted Areas of Patent Defenses

You may note that some areas in Patent Defenses are indicated as “redacted.” These areas contain confidential tips and strategies that are restricted to clients of the firm. If you are a client of the firm and would like access to the redacted confidential areas, please contact [email protected].


Disclaimer

Patent Defenses is a way for businesses and individuals to find information about possible defenses to utility patent infringement claims under U.S. law. Although prepared by a law firm, it does not constitute and is not a substitute for competent patent law advice from competent patent professionals. Among other things, the variability of the kinds of inventions to which patent law can apply and the different circumstances in which inventions are made and infringement claims are brought prevent any overview or analysis that would cover any and all specific circumstances. In addition, and even though we seek to update this website on a roughly weekly basis, we necessarily cannot cover all related developments on all issues.

We seek instead to provide information that we hope will be useful as a starting point for thinking about issues relating to defenses against U.S. patent infringement claims.

Patent Defenses was last updated July 30, 2025.

Patent Defenses is a research tool maintained by Klarquist since 2004. Visit klarquist.com to learn more about us.

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