Continuation patents

Patent applications filed during the pendency of a parent patent application that claim the benefit of the parent's priority date while introducing new or narrowed claims — enabling patent owners to pursue additional claim coverage from a single original disclosure across multiple related patents. Continuation patents are central to patent portfolio strategy because they allow owners to tailor claim language in response to known products, prior art developments, or evolving market conditions. In litigation finance, continuation portfolios present both opportunity and risk: a plaintiff can assert continuation patents with claims specifically written around a defendant's product, but defendants may challenge the continuation on written description, enablement, or double-patenting grounds. Funders evaluating portfolio campaigns assess the continuation chain's prosecution history for prosecution history estoppel that might limit claim scope and for any terminal disclaimers that tie the continuation's term to the parent.

Funders evaluating a continuation-heavy portfolio review the prosecution history for terminal disclaimers, which tie a continuation's expiration to its parent and cap the asserted term, and for prosecution history estoppel created during the parent's prosecution, since claims drafted late in a continuation chain specifically to cover a known product face a materially higher likelihood of an inequitable-conduct or claim-scope challenge. A portfolio built on tightly-drafted continuations targeting an identified defendant's product is underwritten as higher-conviction but also higher invalidity-challenge risk than a portfolio of broader, earlier-filed claims.