Definition
Patent invalidity is a determination, or a defense raised in litigation, that a patent does not meet the legal requirements and therefore cannot be enforced.
Why It Matters Legally
Invalidity is the most common defense in infringement cases. A successful invalidity argument ends the patent owner’s claim entirely, making it a central battleground in disputes.
Example Use Case
Sued for infringement, a defendant proves the patent was anticipated by prior art and the court declares the patent invalid.
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Related Terms
Patent Validity, Prior Art, Anticipation, Inter Partes Review, Patent Litigation