Definition
A patent family is a set of related applications and patents, often filed in multiple countries, that share a common priority document.
Why It Matters Legally
Tracking a patent family matters for global protection and budgeting, since each member must be prosecuted and maintained separately. Family relationships also affect priority and validity arguments.
Example Use Case
A company’s invention is protected by a patent family with members in the US, Europe, China, and Japan, all claiming the same priority date.
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Related Terms
Priority Date, Continuation Application, Patent Portfolio, PCT Application, National Phase