PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US patent 11606204, which resulted in an institution denied status. This outcome means the patent has successfully resisted a challenge at the institution stage, suggesting a stronger defensive posture for the patent owner against future IPRs on the same grounds. All claims remain untested by PTAB.

IPR2026-00115 — [[[Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.), Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.) et al.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.%20et%20al.) v. Network-1 Technologies, Inc.

• Type: Inter Partes Review
• Filed: 2025-11-07
• Status: Institution Denied — the PTAB declined to institute the inter partes review.
• Judge panel: Not publicly available from the provided search snippets.
• Petition grounds: The petition by Samsung Electronics Co., Ltd. et al. challenged claims 1-20 of US Patent No. 11,606,204 based on obviousness under 35 U.S.C. § 103, using a combination of references including US 2008/0172551 (Stadelmann), US 2013/0205128 (Chen), and US 2007/0033621 (Gupta).
• Institution decision: Denied on 2026-04-28. The PTAB denied institution, finding that the petition failed to demonstrate a reasonable likelihood that at least one of the challenged claims was unpatentable. Specifically, the Board determined that the petitioner did not adequately explain how the proposed combination of prior art references rendered the challenged claims obvious, particularly regarding certain features related to secure key management and communication between modules and a server using public key infrastructure.
• Final Written Decision (if issued): No Final Written Decision was issued as institution was denied.
• Settlement / termination: Not applicable; institution was denied.
• Appeal: Not applicable; institution was denied.
• Defensive value: The denial of institution means all challenged claims (1-20) remain patentable as far as this specific PTAB proceeding is concerned. This indicates that the initial obviousness arguments presented by the petitioner were not sufficiently persuasive to meet the institution threshold. Any future IPR petition challenging the same claims on similar grounds would face a heightened burden due to this prior denial.

Strategic summary

All claims (1-20) of US patent 11606204 remain intact and untested by the PTAB. The single IPR proceeding, IPR2026-00115, saw its petition denied institution. This outcome is favorable for the patent owner, Network-1 Technologies, Inc., as it means the patent claims have not been subjected to a full trial at the PTAB, and no claims were canceled or deemed unpatentable.

Regarding estoppel, since IPR2026-00115 was denied institution, statutory estoppel under 35 U.S.C. § 315(e)(2) does not apply to the petitioner, Samsung Electronics Co., Ltd. et al., nor their privies, concerning the grounds raised or that reasonably could have been raised in this petition. This means Samsung could potentially file a new petition with different arguments or prior art. However, the Board's reasoning for denial might influence the viability of similar future petitions. The involvement of Unified Patents as a source for the PTAB data suggests a potential defensive aggregator activity, indicating that the patent is likely being asserted or seen as a threat in the market.

Recommended next steps

• Review Institution Decision: A defendant currently facing assertion of this patent should obtain and thoroughly review the PTAB's complete institution decision for IPR2026-00115 (dated 2026-04-28). The decision's specific reasoning for denying institution will highlight the perceived strengths of the patent's claims and the weaknesses of the obviousness arguments presented. This insight is crucial for developing alternative invalidity arguments, if pursuing another PTAB challenge, or for informing district court litigation defenses.
• Prior Art Analysis: Given the institution denial, a thorough prior art search, potentially broader than what was presented in IPR2026-00115, is advisable to identify new and stronger invalidity contentions. Focus on addressing the specific deficiencies noted by the PTAB in the denied petition.
• Monitoring: Continue to monitor the patent for any new assignments, litigation, or further PTAB filings, as the landscape can change rapidly.