Patent Invalidity Search Strategy Is Changing
Patent invalidity searches must be more comprehensive, strategic, and defensible from the outset.
The era of relying on a second opportunity to uncover stronger prior art may be coming to an end.What Is a Patent Invalidity Search?
A patent invalidity search is a comprehensive investigation conducted to identify prior art that may challenge the validity of an issued patent.
The goal is to uncover evidence showing that the patented invention was:
- Not novel
- Obvious in view of existing technologies
- Previously disclosed before the patent’s priority date
Invalidity searches are commonly used in:
- Patent litigation
- Inter Partes Review (IPR) proceedings
- Patent opposition proceedings
- Licensing negotiations
- Freedom to Operate (FTO) strategy
- Competitive patent disputes
The quality and completeness of an invalidity search often determine the strength of an overall patent challenge strategy.
The Regulatory Core: What the USPTO Is Changing
At the center of this shift is the USPTO’s effort to curb repetitive challenges. The rulemaking emphasizes that IPR should focus on claims, not previously scrutinized, meaning that once a claim has been challenged at PTAB or in court, future attempts may be denied at the institution stage.
Recent USPTO proposals to update 37 CFR Part 42, along with evolving PTAB guidance, reflect a stronger focus on limiting repetitive validity challenges. Building on existing authority under 35 U.S.C. § 325(d), these developments increase pressure on petitioners to present their strongest arguments upfront, raising the strategic stakes in inter partes review proceedings.
PTAB Example: Serial Petitions and 35 U.S.C. §325(d) Discretionary Denial
A strong example of discretionary denial under 35 U.S.C. § 325(d) is Advanced Bionics, LLC v. Med-El Elektromedizinische Geräte GmbH (IPR2019-01469, PTAB, Feb. 13, 2020). In this case, the PTAB established a two-part framework for evaluating whether to institute inter partes review.
The Board first considers whether the same or substantially similar prior art or arguments were previously presented to the USPTO. It then assesses whether the petitioner has demonstrated material error in the earlier evaluation by the Office.
If these conditions are not met, institutions may be denied even where new arguments are raised, reinforcing limits on repetitive challenges.
Similarly, in Becton, Dickinson & Co. v. B. Braun Melsungen AG (IPR2017-01586, PTAB, Dec. 15, 2017), the Board emphasized factors such as overlap in prior art and arguments, prior USPTO examination history, and whether the petition effectively reuses earlier invalidity theories.
The decision reinforces that inter partes review is not intended for repeated reconsideration of the same validity issues, but for efficient and focused review.
Together, these decisions illustrate the PTAB’s increasing reliance on discretionary denial principles.
Traditional IPR Era vs Emerging PTAB / USPTO Practice
| Traditional IPR Era (Pre-shift) | Emerging PTAB / USPTO Direction |
|---|---|
| Iterative invalidity refinement over multiple filings | Front-loaded, single-shot strategy with complete arguments upfront |
| New prior art can be introduced in later challenges | New or cumulative art may be rejected under §325(d) and discretionary denial principles |
| More flexible acceptance of petitions | Increased reliance on discretionary denial |
| Older patents remained open to challenge throughout their lifecycle | Increased consideration of “settled expectations” in assessing late-stage challenges to older patents |
| Reactive, litigation-driven searches | Early-stage, comprehensive, pre-R&D integration |
Strategic Risks and Implications for IP Counsel
In this environment, Invalidity Search (IVS) is shifting from a supporting legal task to a core strategic function in product and IP decision-making.
Exhaustiveness
- Risk: Incomplete prior art coverage may result in discretionary denial or weak invalidity positions
- Implication: IVS must move beyond selective reviews and ensure comprehensive global coverage
Timing
- Risk: Reactive searches may miss early strategic filing opportunities or invalidate downstream challenges
- Implication: IVS should be embedded early in the R&D lifecycle
Integration with FTO
- Risk: Treating IVS and FTO separately may lead to fragmented IP strategy
- Implication: Combined analysis is increasingly necessary for coherent risk assessment
Finality
- Risk: Limited ability to “fix” arguments later in PTAB proceedings
- Implication: Front-loaded invalidity strategy becomes critical at filing stage
Mandates for Invalidity Search Strategy:
The emerging ‘one-and-done’ reality translates into key IVS requirements:
- Prior Art Exclusions: Focus on identifying uncited prior art across global patent and non-patent literature that was not previously considered during prosecution.
- Targeted Combination Potential: Generate strong combinations of references, typically requiring combinations of two or more references for independent claim invalidation (obviousness-based arguments), with additional references often needed for dependent claims to strengthen coverage.
- Exhaustive Scope: Searches must be comprehensive, extending across global patent literature, published patent applications, and non-patent literature to maximize the chances of finding decisive, non-cumulative art.
The Business Impact of Missing Prior Art
The consequences of an incomplete invalidity search can be significant.
Organizations may face:
- Lost opportunities to challenge blocking patents
- Increased litigation costs
- Weaker negotiation positions
- Delayed product launches
- Long-term competitive disadvantages
In an environment where repeat challenges may become more difficult, missing a critical reference can have lasting consequences.
No Second Chances: The Cost of Missing Prior Art Has Never Been Higher
Under the framework shaped by USPTO rulemaking and ongoing proposals published in the Federal Register, invalidity challenges are shifting from an iterative process to a decisive, front-loaded strategy requiring precision and completeness from the outset.
For innovators, the implications are clear. The cost of missing critical prior art is no longer limited to a failed petition; it may permanently foreclose the ability to challenge a patent.
“Limited room for second chances. Invalidity Search must be right the first time.”
MaxVal’s Patent Invalidity Search services provide precisely this capability. By combining expert analysis with advanced AI-driven tools, we conduct comprehensive searches across global patent and non-patent literature to uncover prior art directly aligned to disputed asserted claims. The result is evidence that is clear, defensible, and strategically valuable for litigation and IP decision-making.
Looking to Build a Stronger Patent Search and Analytics Strategy?
Patent invalidity searches are just one component of an effective IP strategy. Organizations that consistently make better IP decisions typically combine prior art searches, Freedom to Operate (FTO) analysis, patentability assessments, invalidity searches, patent landscape studies, and patent analytics to gain a comprehensive understanding of technology risks and opportunities.
To learn more, explore our guide: Patent Search & Analytics: A Complete Guide for Enterprise IP Teams. It explains the key search and analytics approaches and how they support innovation, litigation, and business decision-making.
