Juristat Adds Ex Parte Reexamination Data, Connecting Post-Grant Challenge Outcomes to the Prosecution Record Behind Them

New Haven CT , Sept. 11, 2026: Juristat today announced reexamination data across its patent analytics application and the Juristat Data Layer (MCP), giving patent attorneys, corporate IP teams, and litigation and licensing groups a direct read on how a patent’s claims survived a formal challenge.

The addition arrives as ex parte reexamination has become one of the more active tools in patent strategy. [FLAG , clear before publish] According to Juristat’s analysis of USPTO records, ex parte reexamination has overtaken inter partes review as the leading post-grant validity tool for the first time since the America Invents Act, with filings up 53 percent year over year in 2025 and on pace for roughly 870 in 2026.

An issued patent has never told anyone whether its claims would hold up if tested. Reexamination is a key place where that gets answered, and the answer has always been hard to reach: buried in USPTO records and disconnected from the prosecution history that explains why a patent held up or did not. Every reexam involves two applications, the challenge and the original patent under review, and until now nothing made it easy to see them together at scale.

Juristat closes that gap. Users can pull any proceeding by control number and see claim survival, confirmed, amended, cancelled, or disclaimed, alongside the original prosecution history. In practice, that means teams can:

• Audit their own portfolio for reexam history and weigh the result against upcoming maintenance fee decisions.
• Check a target’s patent for reexam history before asserting it, licensing it, or clearing a freedom-to-operate opinion.
• Benchmark examiners and art units on how often their allowances get amended or cancelled on reexam, and use it to inform interview/prosecution strategy on future filings.
• Reuse claim amendments and arguments that survived reexam when drafting continuations or divisionals in the same family.

This connected view is unique to Juristat. No one else ties reexamination outcomes to the full prosecution record that produced them. Juristat built its USPTO dataset before the agency imposed rate limits on data access, and that depth is what makes the reexam picture possible.

“An issued patent tells you a patent office said yes once. Reexamination tells you whether the claims held up when someone pushed back. Connecting that outcome to the prosecution record behind it is the difference between a defensible read on validity risk and a guess.” Lauren Bonner, CEO, Juristat.

Juristat is the data and intelligence layer for AI-driven patent work. Reexamination data extends that record so IP professionals can size up validity risk before a filing, assertion, or licensing decision, watch portfolio exposure proactively instead of discovering it after a challenge lands, and open a business-development conversation with real data behind it.

Reexamination data is available now. Available as an annual add-on, or per tool call through the Data Layer (MCP).] For more background, visit our blog.

About Juristat:

Juristat turns patent office  data into patent intelligence. Built on more than 10 million pending, abandoned, and granted applications, coverage of over 20 years of patent prosecution history and more than 20,000 examiners, Juristat delivers analytics and prosecution intelligence for the way IP professionals actually work.

Media Contact: Patty Remes, CMO, marketing@juristat.com