PTAB challenges

Based on a comprehensive review of the USPTO's public records, no inter partes review (IPR) or other America Invents Act (AIA) trial proceedings have been filed against U.S. Patent No. 7,969,880. The absence of any such challenges is a critical piece of information for any company currently facing litigation over this patent.

Strategic Summary

All claims of U.S. Patent No. 7,969,880 are currently untested before the Patent Trial and Appeal Board (PTAB). This means that no claims have been canceled, and the patent has not been "hardened" by surviving a PTAB challenge.

From a defensive standpoint, this is a clean slate. There is currently no petitioner estoppel under 35 U.S.C. § 315(e)(2) in effect for this patent. A defendant is therefore free to file a new IPR petition based on any prior art patents or printed publications that raise a substantial new question of patentability. The prior art analyzed during the patent's original prosecution provides a starting point, but a new, dedicated search focused on the key "modifying module" limitation is likely to uncover stronger references.

The fact that no IPRs have been filed, despite an active litigation campaign by Athena Security, LLP beginning in late 2025, is significant. It may indicate that the defendants in the ongoing cases (Google, Dell, HPE, Cisco) have either chosen to focus their validity challenges in district court or are still within the one-year statutory window to file an IPR, which runs from the date they were served with an infringement complaint.

Recommended Next Steps

For a defendant facing an assertion of the '880 patent, the immediate strategic priority should be to evaluate the viability of an inter partes review.

1. Conduct a Comprehensive Prior Art Search: The prior art cited by the examiner suggests the core inventive concept is the ability to modify the computational expression (the hash function) itself, rather than just changing its inputs. A new prior art search should be commissioned to find references that teach or suggest this specific feature. The goal is to identify art that is stronger than what the examiner considered, thereby creating a strong basis for an IPR petition.

2. Evaluate IPR Filing Deadlines: A petition for IPR must be filed within one year of the date on which the petitioner, a real party in interest, or a privy of the petitioner is served with a complaint alleging infringement of the patent. Any defendant must be acutely aware of this deadline to preserve the IPR option.

3. Formulate Invalidity Contentions: A strong IPR petition can serve as the foundation for invalidity contentions in parallel district court litigation. If the PTAB institutes review, it can significantly increase a defendant's leverage and may lead to a stay of the district court case, which is often more costly and time-consuming.

Given that no PTAB activity exists, a defendant has the full and unencumbered opportunity to be the first to challenge the validity of US Patent 7,969,880 before the PTAB.