Target Corporation v. Headwater Research LLC

Target Corporation, a prominent American retail operating company, initiated an Inter Partes Review (IPR) against Headwater Research LLC at the Patent Trial and Appeal Board (PTAB). Headwater Research LLC is identified as a non-practicing entity (NPE) or patent assertion entity (PAE) with a concentrated patent portfolio in mobile device intelligence, background data management, network optimization technologies, and cloud messaging. Headwater Research has an active history of litigation against major consumer electronics manufacturers and wireless carriers, including successful assertions against Samsung, resulting in a significant jury award, and other cases against Apple, Verizon, Google, and AT&T, often leading to early settlements or dismissals. The IPR filed by Target is likely a defensive maneuver in response to an underlying patent infringement lawsuit filed by Headwater Research against Target, which accuses Target's use of cloud messaging solutions, potentially Google's Firebase Cloud Messaging (FCM), of infringing Headwater's patents.

The patent at issue in this IPR is U.S. Patent 10,321,320. This patent is part of Headwater Research's portfolio focused on cloud messaging and mobile network services. While a specific one-line technical sketch for this patent isn't explicitly detailed as an abstract in the search results, Headwater's broader portfolio in this area covers innovations "designed to boost Wi-Fi speed and reliability, reduce data usage and network congestion, and improve overall connectivity," as well as "mobile device operating system and cloud technology," including "application-aware services now being deployed by mobile operators" for network access management on mobile devices. The IPR (IPR2026-00153) was filed at the Patent Trial and Appeal Board on November 24, 2025. The procedural posture indicates that the petition was "Not Instituted - Procedural," meaning the PTAB declined to initiate a full review of the patent's validity on procedural grounds rather than on the merits of the patentability arguments. The PTAB serves as an alternative forum to district courts for challenging patent validity.

This case is notable as it reflects Headwater Research's ongoing and aggressive patent monetization strategy against a wide array of prominent companies in the tech and retail sectors. Target, as a large retail operating company, represents a typical defendant in such campaigns. The "Not Instituted - Procedural" status for this IPR is particularly significant. It suggests that Target's petition failed to meet specific procedural requirements for institution, which could be influenced by recent policy shifts at the PTAB. Since late 2025, the PTAB has seen a reduced institution rate, partly due to the Director now solely deciding whether to institute IPRs and new proposed rules that limit when IPRs may proceed, including considerations of U.S. manufacturing footprint or parallel litigation. This outcome can have a substantial impact on Target's defensive strategy in any parallel district court litigation regarding patent 10321320, potentially leaving them to rely solely on district court invalidity defenses.

Headwater Research LLC filed a patent infringement lawsuit against Target Corporation in the U.S. District Court for the Eastern District of Texas on September 18, 2025, Case No. 2:25-cv-00963. This lawsuit asserts infringement of U.S. Patent 10,321,320, among others. The case was consolidated for all pretrial issues with a lead case, Headwater Research LLC v. Walmart Inc., Case No. 2:25-cv-00961, on October 23, 2025.

In response to the infringement suit, Target Corporation filed an Inter Partes Review (IPR) petition, IPR2026-00153, at the Patent Trial and Appeal Board (PTAB) on November 24, 2025, challenging the validity of U.S. Patent 10,321,320. Headwater Research LLC, as the patent owner, filed mandatory notices with the PTAB, identifying the parallel district court litigation against Target and others as related matters.

On March 22, 2026, the PTAB issued a "Director Discretionary Decision" to deny institution of IPR2026-00153, meaning the Board declined to initiate a full review of the patent's validity on procedural grounds. The decision was explicitly a "Discretionary Denial." This outcome is consistent with a broader trend of decreased IPR institution rates in late 2025 and early 2026, following policy shifts at the USPTO under Acting Director Coke Stewart and subsequently Director John Squires. These shifts have expanded the use of discretionary denial factors, including considerations of "settled expectations" and the presence of parallel litigation that might conclude sooner than an IPR.

In the parallel district court litigation, Target Corporation filed a motion to stay the proceedings pending the IPR. On March 6, 2026, Target Corporation filed an unopposed motion for a hearing regarding their motion to stay, as well as other motions to stay filed by co-defendants. An order was issued on March 11, 2026, granting a hearing on these motions to stay, which was set for March 18, 2026.

Further developments in the district court case include:

• Initial Pleadings: Headwater Research LLC filed the complaint for patent infringement on September 18, 2025. Target Corporation was granted an unopposed application for an extension of time to answer the complaint, making the answer due by November 27, 2025.
• Consolidation: As noted, the case was consolidated for pretrial issues with Headwater Research LLC v. Walmart Inc., Case No. 2:25-cv-00961, on October 23, 2025.
• Claim Construction: The scheduling order for related cases indicates that parties were to exchange proposed claim constructions by January 21, 2026, and file opening claim construction briefs by February 11, 2026.
• Discovery: Preliminary infringement contentions were to be served by Headwater on October 17, 2025, and preliminary invalidity contentions by defendants (including Target) by December 17, 2025.
• Motions to Stay: Target's motion to stay the district court litigation pending the IPR (IPR2026-00153) was filed, and a hearing on this and other motions to stay was scheduled for March 18, 2026.

As of the latest available information (March 13, 2026, for the district court docket), the patent infringement case remains active in the U.S. District Court for the Eastern District of Texas. The IPR on Patent 10,321,320 was not instituted, leaving Target to pursue its invalidity defenses in the district court.

In the Inter Partes Review (IPR) case IPR2026-00153, Target Corporation v. Headwater Research LLC, the petitioner, Target Corporation, is represented by attorneys from Fish & Richardson P.C..

The counsel of record for Target Corporation are:

• Michael Hawkins (Petitioner Counsel)
  • Firm: Fish & Richardson P.C., Minneapolis, MN.
  • Note: Michael Hawkins is a registered patent attorney (Reg. No. 57,867).
• Karan Jhurani (Petitioner Counsel)
  • Firm: Fish & Richardson P.C., Minneapolis, MN.
  • Note: Karan Jhurani is a registered patent attorney (Reg. No. 71,777).

While Target Corporation has in-house legal teams, including a Chief Legal and Compliance Officer and various legal affairs and risk and compliance roles, the primary representation for this specific IPR proceeding appears to be handled by outside counsel, Fish & Richardson P.C. In-house patent counsel often manage outside counsel for specialized litigation like IPRs.

Headwater Research LLC, the Patent Owner in IPR2026-00153, is represented by counsel from Russ, August & Kabat.

The following attorneys are identified as representing Headwater Research LLC in this and related proceedings:

• Reza Mirzaie (Lead Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Mirzaie is listed as lead counsel for Headwater Research LLC in this IPR and has been involved in other Headwater Research LLC patent litigation, including a patent infringement verdict against Verizon Communications. He has also signed documents in related district court cases involving Headwater Research LLC.

• Marc A. Fenster (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Fenster is a member of the trial team that secured a $175 million jury verdict for Headwater Research LLC against Verizon Communications and a $278 million verdict against Samsung. He is also listed as counsel in other Headwater Research LLC cases, including against Amazon and Google.

• Kristopher Ryan Davis (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Davis was part of the trial team for Headwater Research LLC's successful patent infringement case against Verizon Communications. He also appeared as counsel for Headwater in litigation against Verizon Communications in the Eastern District of Texas.

• Brian D. Ledahl (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Ledahl was also on the trial team for the Headwater Research LLC v. Verizon Communications case. He has appeared in other Headwater cases, including against Verizon.

• Dale Chang (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Chang was part of the trial team for the Headwater Research LLC v. Verizon Communications case. He is also listed as counsel in IPR2026-00049 involving Google LLC and Headwater Research LLC.

• Benjamin T. Wang (Counsel)

  • Firm: Russ, August & Kabat.
  • Note: Wang was part of the trial team for Headwater Research LLC's successful patent infringement case against Verizon Communications. He also appeared as counsel for Headwater in litigation against Verizon Communications in the Eastern District of Texas.

• James Shrin Tsuei (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Tsuei was part of the trial team for the Headwater Research LLC v. Verizon Communications case. He also appeared as counsel for Headwater in litigation against Verizon Communications in the Eastern District of Texas.

• Philip X. Wang (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Wang was part of the trial team for Headwater Research LLC's successful patent infringement case against Verizon Communications. He also appeared as counsel for Headwater in litigation against Verizon Communications in the Eastern District of Texas and in IPR2026-00049.

• Jason Wietholter (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Wietholter was part of the trial team for Headwater Research LLC's successful patent infringement case against Verizon Communications. He also appeared as counsel for Headwater in litigation against Verizon Communications in the Eastern District of Texas.

• Andrea Leigh Fair (Counsel)

  • Firm: Miller Fair Henry PLLC (mentioned in relation to Verizon verdict, suggesting potential co-counsel or local counsel role), or Russ, August & Kabat (as indicated by appearance in other Headwater cases).
  • Note: Fair was part of the trial team that secured the $175 million jury verdict for Headwater Research LLC against Verizon Communications. She also filed a notice of attorney appearance on behalf of Headwater Research LLC in a related district court case against Target Corporation.

• Neil Alan Rubin (Counsel)

  • Firm: Russ, August & Kabat.
  • Note: Rubin appeared as counsel for Headwater in litigation against Verizon Communications in the Eastern District of Texas and in IPR2026-00049.

• James A. Milkey (Counsel)

  • Firm: Russ, August & Kabat, Los Angeles, CA.
  • Note: Milkey is listed as counsel for Headwater Research LLC in IPR2026-00049 involving Google LLC.

The "Patent Owner's Mandatory Notices Pursuant to 37 C.F.R. §42.8(a)(2)" for IPR2026-00153 explicitly identifies Reza Mirzaie of Russ, August & Kabat as lead counsel, and lists the firm's contact information. It also indicates that Headwater Research LLC consents to electronic service to an email address associated with Russ, August & Kabat.