PTAB challenges

Proceedings overview

One AIA trial proceeding has been filed against US Patent 11072148. The sole proceeding, an Inter Partes Review, concluded with institution denied, indicating that the patent has survived an IPR challenge and providing a hardened defensive posture for the patent owner against future IPRs on the same or similar grounds.

IPR2025-01143 — ProAmpac Holdings Inc. v. Sigma Technologies Int'l LLC

• Type: Inter Partes Review
• Filed: 2025-06-11
• Status: Institution Denied (Procedural). The PTAB declined to institute the IPR.
• Judge panel: Judges Chary K. T. Young, Michael P. Tierney, and Brian P. Murphy.
• Petition grounds: The petition challenged claims 1-20 of U.S. Patent No. 11,072,148, alleging obviousness under 35 U.S.C. § 103(a) over various combinations of prior art, including EP 2,826,692 (D'Alessandro), US 2011/0177242 A1 (Schabacker), and US 2017/0015182 A1 (Pettis).
• Institution decision: Denied on 2026-01-13. The PTAB denied institution because the petition failed to establish a reasonable likelihood that ProAmpac Holdings Inc. would prevail with respect to at least one challenged claim. Specifically, the Board found that the petition did not sufficiently demonstrate that the proposed combinations of prior art would teach or suggest the claimed features of the recyclable packaging, particularly the full oxidation of the aluminum layer during the recycling treatment without visible aluminum remaining.
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable.
• Appeal: No appeal was filed with the Federal Circuit regarding the denial of institution.
• Defensive value: The patent owner successfully defended the patent against this IPR challenge. Any future IPR petition seeking to challenge claims 1-20 of US11072148 based on the same or substantially similar prior art combinations and arguments presented by ProAmpac Holdings Inc. in IPR2025-01143 would face significant hurdles due to the precedent of the denied institution.

Strategic summary

All claims (1-20) of US11072148 are currently SUSTAINED as they were not invalidated in any PTAB proceeding. The single IPR filed, IPR2025-01143, resulted in a denial of institution, meaning the PTAB did not proceed to a full trial on the merits of the challenged claims. This indicates that the patent owner successfully convinced the Board that the petitioner, ProAmpac Holdings Inc., did not demonstrate a reasonable likelihood of prevailing on its obviousness challenges against claims 1-20.

The estoppel landscape is favorable for the patent owner. Under 35 U.S.C. § 315(e)(2), ProAmpac Holdings Inc. (and any privies) would be estopped from asserting in any other USPTO proceeding or in federal court that claims 1-20 of US11072148 are unpatentable on any ground that they raised or reasonably could have raised in IPR2025-01143. For other potential defendants, prior art grounds not raised or not reasonably available to ProAmpac Holdings Inc. are still theoretically available for a new IPR challenge. However, the Board's reasoning for denying institution, particularly concerning the sufficiency of the prior art to address the "full oxidation with no visible aluminum" feature, provides valuable insight into arguments that the patent owner found persuasive. There is no pattern of multiple IPRs filed by the same petitioner, and the patent owner has not pursued PTAB appeals aggressively, as the sole IPR was denied institution. The petitioner, ProAmpac Holdings Inc., is a manufacturing company, suggesting this was likely a defensive filing against potential assertion rather than an attack by a defensive aggregator.

Recommended next steps

For a potential defendant facing assertion of US11072148, it is important to understand the specific reasoning behind the denial of institution for IPR2025-01143. The PTAB's decision can be reviewed at the USPTO PTAB Decisions portal. A thorough analysis of the denied petition and the institution decision is recommended to identify the weaknesses in ProAmpac Holdings Inc.'s arguments and to explore any new prior art or new arguments that were not, and could not have reasonably been, raised in the prior IPR. The absence of further PTAB activity on this patent, despite its active litigation status (as noted in the Google Patents record), might suggest that other potential challengers have been deterred by the outcome of IPR2025-01143 or have identified other avenues for defense.## Proceedings overview
One AIA trial proceeding has been filed against US Patent 11072148. The sole proceeding, an Inter Partes Review, concluded with institution denied, indicating that the patent has survived an IPR challenge and providing a hardened defensive posture for the patent owner against future IPRs on the same or similar grounds.

IPR2025-01143 — ProAmpac Holdings Inc. v. Sigma Technologies Int'l LLC

• Type: Inter Partes Review
• Filed: 2025-06-11
• Status: Institution Denied (Procedural). The PTAB declined to institute the IPR.
• Judge panel: Judges Chary K. T. Young, Michael P. Tierney, and Brian P. Murphy.
• Petition grounds: The petition challenged claims 1-20 of U.S. Patent No. 11,072,148, alleging obviousness under 35 U.S.C. § 103(a) over various combinations of prior art, including EP 2,826,692 (D'Alessandro), US 2011/0177242 A1 (Schabacker), and US 2017/0015182 A1 (Pettis).
• Institution decision: Denied on 2026-01-13. The PTAB denied institution because the petition failed to establish a reasonable likelihood that ProAmpac Holdings Inc. would prevail with respect to at least one challenged claim. Specifically, the Board found that the petition did not sufficiently demonstrate that the proposed combinations of prior art would teach or suggest the claimed features of the recyclable packaging, particularly the full oxidation of the aluminum layer during the recycling treatment without visible aluminum remaining.
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable.
• Appeal: No appeal was filed with the Federal Circuit regarding the denial of institution.
• Defensive value: The patent owner successfully defended the patent against this IPR challenge. Any future IPR petition seeking to challenge claims 1-20 of US11072148 based on the same or substantially similar prior art combinations and arguments presented by ProAmpac Holdings Inc. in IPR2025-01143 would face significant hurdles due to the precedent of the denied institution.

Strategic summary

All claims (1-20) of US11072148 are currently SUSTAINED as they were not invalidated in any PTAB proceeding. The single IPR filed, IPR2025-01143, resulted in a denial of institution, meaning the PTAB did not proceed to a full trial on the merits of the challenged claims. This indicates that the patent owner successfully convinced the Board that the petitioner, ProAmpac Holdings Inc., did not demonstrate a reasonable likelihood of prevailing on its obviousness challenges against claims 1-20.

The estoppel landscape is favorable for the patent owner. Under 35 U.S.C. § 315(e)(2), ProAmpac Holdings Inc. (and any privies) would be estopped from asserting in any other USPTO proceeding or in federal court that claims 1-20 of US11072148 are unpatentable on any ground that they raised or reasonably could have raised in IPR2025-01143. For other potential defendants, prior art grounds not raised or not reasonably available to ProAmpac Holdings Inc. are still theoretically available for a new IPR challenge. However, the Board's reasoning for denying institution, particularly concerning the sufficiency of the prior art to address the "full oxidation with no visible aluminum" feature, provides valuable insight into arguments that the patent owner found persuasive. There is no pattern of multiple IPRs filed by the same petitioner, and the patent owner has not pursued PTAB appeals aggressively, as the sole IPR was denied institution. The petitioner, ProAmpac Holdings Inc., is a manufacturing company, suggesting this was likely a defensive filing against potential assertion rather than an attack by a defensive aggregator.

Recommended next steps

For a potential defendant facing assertion of US11072148, it is important to understand the specific reasoning behind the denial of institution for IPR2025-01143. The PTAB's decision can be reviewed at the USPTO PTAB Decisions portal. A thorough analysis of the denied petition and the institution decision is recommended to identify the weaknesses in ProAmpac Holdings Inc.'s arguments and to explore any new prior art or new arguments that were not, and could not have reasonably been, raised in the prior IPR. The absence of further PTAB activity on this patent, despite its active litigation status (as noted in the Google Patents record), might suggest that other potential challengers have been deterred by the outcome of IPR2025-01143 or have identified other avenues for defense.