Litigation summary

I have reviewed the search results and the provided patent text. The Google Patents page itself lists several litigation events, primarily PTAB (IPR) cases and District Court cases in Texas.

I will consolidate the information from the initial patent text and the search results to provide the requested details for each case.

General Observations:

• Headwater Research LLC is the current assignee of US9647918B2. Therefore, in infringement suits, Headwater Research LLC (or an affiliated entity) is likely the plaintiff. In IPRs, Headwater Research LLC is the patent owner/defendant.
• Unified Patents is often the petitioner in IPRs (or its members like Samsung).
• The District Court cases are generally for patent infringement.

Let's break down each case:

I. PTAB Cases (Inter Partes Reviews - IPRs)

1. Case Number: IPR2024-01397

   • Plaintiff(s) / Petitioner(s): Unified Patents PTAB Data (implying Unified Patents or one of its members as petitioner)
   • Defendant(s) / Patent Owner(s): Headwater Research LLC (as the patent owner)
   • Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Filing Date: Not explicitly stated in the provided snippets, but typically IPRs are filed in the year of their case number. For IPR2024-01396, the filing date is 2024-09-09. It's reasonable to infer a similar filing timeframe for IPR2024-01397. However, since it's not explicitly in the search results for this specific IPR, I will state it's not explicitly available.
   • Outcome/Current Status: Not Instituted - Procedural

2. Case Number: IPR2024-01396

   • Plaintiff(s) / Petitioner(s): Samsung Electronics Co Ltd
   • Defendant(s) / Patent Owner(s): Headwater Research LLC
   • Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Filing Date: 2024-09-09
   • Outcome/Current Status: Pending - Instituted. However, a Director Review Order dated July 17, 2025, granted Director Review, vacated the decision granting institution, and denied institution of Inter Partes Review, primarily due to Fintiv factors related to a parallel proceeding's trial date. So, while the Google Patents status says "Pending - Instituted", the more recent search result indicates the institution was denied after Director Review. I will prioritize the search result.
     • Updated Status: Institution Denied (after Director Review vacating prior institution decision)

3. Case Number: IPR2026-00137

   • Plaintiff(s) / Petitioner(s): Unified Patents PTAB Data (implying Unified Patents or one of its members as petitioner)
   • Defendant(s) / Patent Owner(s): Headwater Research LLC (as the patent owner)
   • Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Filing Date: Not explicitly stated in the provided snippets. Based on the case number, it was filed in 2026.
   • Outcome/Current Status: Pending

II. US District Court Cases

The search results for the District Court cases did not directly link to detailed case dockets on Unified Patents that explicitly listed plaintiff/defendant for US9647918 for all the listed cases, but they confirmed the jurisdictions and case numbers. Given Headwater Research LLC is the current assignee, it is highly probable that Headwater Research LLC (or a related entity) is the plaintiff in these infringement cases. The defendant usually becomes clear when a complaint is filed and served. For Case 2:23-cv-00641, snippet explicitly names "HEADWATER RESEARCH LLC, Plaintiff, v. SAMSUNG E". This supports the assumption that Headwater Research LLC is the plaintiff in these district court cases.

1. Case Number: 7:25-cv-00379

   • Plaintiff(s): Likely Headwater Research LLC (based on general litigation patterns for this patent and assignee information). However, one search result for "7:25-cv-00379" indicates a case titled "Hernandez-Cuevas v. Western VA Regional Jail" in the Western District of Virginia, which is a different jurisdiction and plaintiff/defendant than expected for a patent case involving US9647918. This suggests the initial Unified Patents link provided in the prompt's context may be a generic link or that the case number "7:25-cv-00379" has been reused in a different jurisdiction for an unrelated matter. Given the strong instruction to interpret identifiers literally, and the explicit mention of "Texas Western District Court" in the original Google Patents context, I will prioritize the original context regarding the jurisdiction and case number for US9647918, but note the lack of specific plaintiff/defendant details for this specific patent from the search.
   • Defendant(s): Not explicitly stated in the provided snippets for a patent case in this specific jurisdiction/case number, but likely an alleged infringer of US9647918.
   • Jurisdiction: Texas Western District Court
   • Filing Date: Not explicitly stated in the provided snippets. The case number "25" suggests a 2025 filing year.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

2. Case Number: 7:25-cv-00374

   • Plaintiff(s): Likely Headwater Research LLC.
   • Defendant(s): Not explicitly stated in the provided snippets, but likely an alleged infringer of US9647918.
   • Jurisdiction: Texas Western District Court
   • Filing Date: Not explicitly stated in the provided snippets. The case number "25" suggests a 2025 filing year.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

3. Case Number: 2:25-cv-00908

   • Plaintiff(s): Likely Headwater Research LLC.
   • Defendant(s): Not explicitly stated in the provided snippets, but likely an alleged infringer of US9647918.
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Not explicitly stated in the provided snippets. The case number "25" suggests a 2025 filing year.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

4. Case Number: 2:25-cv-00907

   • Plaintiff(s): Likely Headwater Research LLC. However, one search result for "1:25-cv-00907 (D.D.C.)" mentions "Radio Free Asia v. United States" in the D.D.C., which is a different jurisdiction. Similar to 7:25-cv-00379, I will stick to the original context provided by Google Patents regarding "Texas Eastern District Court" for the patent in question.
   • Defendant(s): Not explicitly stated in the provided snippets, but likely an alleged infringer of US9647918.
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Not explicitly stated in the provided snippets. The case number "25" suggests a 2025 filing year.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

5. Case Number: 2:25-cv-00906

   • Plaintiff(s): Likely Headwater Research LLC. However, one search result for "2:2025cv00906" indicates "AVHS AL I, LLC et al v. Sawyer" in the Northern District of Alabama, which is a different jurisdiction. Similar to the previous Texas Western cases, I will stick to the original context provided by Google Patents regarding "Texas Eastern District Court" for the patent in question.
   • Defendant(s): Not explicitly stated in the provided snippets, but likely an alleged infringer of US9647918.
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Not explicitly stated in the provided snippets. The case number "25" suggests a 2025 filing year.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

6. Case Number: 2:23-cv-00641

   • Plaintiff(s): Headwater Research LLC
   • Defendant(s): Samsung Electronics Co., Ltd., et al.
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Not explicitly stated in the direct search results for this case. The case number "23" suggests a 2023 filing year.
   • Outcome/Current Status: US case filed (implies pending/ongoing). The document from October 06, 2025 mentions "Defendant to disclose final invalidity theories", which indicates the case is actively proceeding.

Summary of identified litigation:

1. PTAB Cases:

• Case Number: IPR2024-01397

  • Plaintiff(s): Unified Patents PTAB Data
  • Defendant(s): Headwater Research LLC
  • Jurisdiction: PTAB (Patent Trial and Appeal Board)
  • Filing Date: Not explicitly stated in search results for this specific IPR.
  • Outcome/Current Status: Not Instituted - Procedural

• Case Number: IPR2024-01396

  • Plaintiff(s): Samsung Electronics Co Ltd
  • Defendant(s): Headwater Research LLC
  • Jurisdiction: PTAB (Patent Trial and Appeal Board)
  • Filing Date: 2024-09-09
  • Outcome/Current Status: Institution Denied (after Director Review vacated the decision granting institution on July 17, 2025)

• Case Number: IPR2026-00137

  • Plaintiff(s): Unified Patents PTAB Data
  • Defendant(s): Headwater Research LLC
  • Jurisdiction: PTAB (Patent Trial and Appeal Board)
  • Filing Date: Not explicitly stated in search results.
  • Outcome/Current Status: Pending

2. US District Court Cases:

• Case Number: 7:25-cv-00379

  • Plaintiff(s): Likely Headwater Research LLC.
  • Defendant(s): Not explicitly stated in search results for a patent case involving US9647918. (Note: Search results for this case number indicate an unrelated case in a different jurisdiction, but the prompt's source explicitly links this case number in Texas Western District Court to the patent. I prioritize the original context regarding jurisdiction.)
  • Jurisdiction: Texas Western District Court
  • Filing Date: Likely 2025 (based on case number). Not explicitly stated.
  • Outcome/Current Status: US case filed (implies pending/ongoing)

• Case Number: 7:25-cv-00374

  • Plaintiff(s): Likely Headwater Research LLC.
  • Defendant(s): Not explicitly stated in search results for a patent case involving US9647918.
  • Jurisdiction: Texas Western District Court
  • Filing Date: Likely 2025 (based on case number). Not explicitly stated.
  • Outcome/Current Status: US case filed (implies pending/ongoing)

• Case Number: 2:25-cv-00908

  • Plaintiff(s): Likely Headwater Research LLC.
  • Defendant(s): Not explicitly stated in search results for a patent case involving US9647918.
  • Jurisdiction: Texas Eastern District Court
  • Filing Date: Likely 2025 (based on case number). Not explicitly stated.
  • Outcome/Current Status: US case filed (implies pending/ongoing)

• Case Number: 2:25-cv-00907

  • Plaintiff(s): Likely Headwater Research LLC.
  • Defendant(s): Not explicitly stated in search results for a patent case involving US9647918. (Note: Search results for this case number indicate an unrelated case in a different jurisdiction, but the prompt's source explicitly links this case number in Texas Eastern District Court to the patent. I prioritize the original context regarding jurisdiction.)
  • Jurisdiction: Texas Eastern District Court
  • Filing Date: Likely 2025 (based on case number). Not explicitly stated.
  • Outcome/Current Status: US case filed (implies pending/ongoing)

• Case Number: 2:25-cv-00906

  • Plaintiff(s): Likely Headwater Research LLC.
  • Defendant(s): Not explicitly stated in search results for a patent case involving US9647918. (Note: Search results for this case number indicate an unrelated case in a different jurisdiction, but the prompt's source explicitly links this case number in Texas Eastern District Court to the patent. I prioritize the original context regarding jurisdiction.)
  • Jurisdiction: Texas Eastern District Court
  • Filing Date: Likely 2025 (based on case number). Not explicitly stated.
  • Outcome/Current Status: US case filed (implies pending/ongoing)

• Case Number: 2:23-cv-00641

  • Plaintiff(s): Headwater Research LLC
  • Defendant(s): Samsung Electronics Co., Ltd., et al.
  • Jurisdiction: Texas Eastern District Court
  • Filing Date: Likely 2023 (based on case number). Not explicitly stated.
  • Outcome/Current Status: US case filed (implies pending/ongoing). The case is active with defendant expected to disclose final invalidity theories by August 11, 2025.

I also need to address "First worldwide family litigation filed" from Darts-ip. The prompt states the Darts-ip link is for the patent family, and the Google Patents page itself does not provide specific case details like plaintiff, defendant, case number, or filing date for this entry. Without more specific information directly tied to US9647918 from the search, I cannot list it with all the requested details.

I will structure the output as requested. I'll make sure to use the current date May 28, 2026.As of May 28, 2026, the following litigation involving US patent 9647918 is known:

I. PTAB (Patent Trial and Appeal Board) Cases:

1. Case Number: IPR2024-01397

   • Plaintiff(s): Unified Patents PTAB Data
   • Defendant(s): Headwater Research LLC
   • Jurisdiction: PTAB (Patent Trial and Appeal Board)
   • Filing Date: Not explicitly available in the provided search results.
   • Outcome/Current Status: Not Instituted - Procedural

2. Case Number: IPR2024-01396

   • Plaintiff(s): Samsung Electronics Co Ltd
   • Defendant(s): Headwater Research LLC
   • Jurisdiction: PTAB (Patent Trial and Appeal Board)
   • Filing Date: 2024-09-09
   • Outcome/Current Status: Institution Denied. A Director Review Order dated July 17, 2025, granted Director Review, vacated the decision granting institution, and denied institution of Inter Partes Review.

3. Case Number: IPR2026-00137

   • Plaintiff(s): Unified Patents PTAB Data
   • Defendant(s): Headwater Research LLC
   • Jurisdiction: PTAB (Patent Trial and Appeal Board)
   • Filing Date: Not explicitly available in the provided search results.
   • Outcome/Current Status: Pending

II. US District Court Cases:

Headwater Research LLC is the current assignee of US9647918B2, and is therefore presumed to be the plaintiff in these patent infringement cases unless otherwise specified.

1. Case Number: 7:25-cv-00379

   • Plaintiff(s): Likely Headwater Research LLC.
   • Defendant(s): Not explicitly stated in the provided search results for a patent case involving US9647918. (Note: A search for this case number also yielded an unrelated case in the Western District of Virginia).
   • Jurisdiction: Texas Western District Court
   • Filing Date: Likely 2025 (based on case number). Not explicitly available.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

2. Case Number: 7:25-cv-00374

   • Plaintiff(s): Likely Headwater Research LLC.
   • Defendant(s): Not explicitly stated in the provided search results for a patent case involving US9647918.
   • Jurisdiction: Texas Western District Court
   • Filing Date: Likely 2025 (based on case number). Not explicitly available.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

3. Case Number: 2:25-cv-00908

   • Plaintiff(s): Likely Headwater Research LLC.
   • Defendant(s): Not explicitly stated in the provided search results for a patent case involving US9647918.
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Likely 2025 (based on case number). Not explicitly available.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

4. Case Number: 2:25-cv-00907

   • Plaintiff(s): Likely Headwater Research LLC.
   • Defendant(s): Not explicitly stated in the provided search results for a patent case involving US9647918. (Note: A search for this case number also yielded an unrelated case in the D.D.C.).
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Likely 2025 (based on case number). Not explicitly available.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

5. Case Number: 2:25-cv-00906

   • Plaintiff(s): Likely Headwater Research LLC.
   • Defendant(s): Not explicitly stated in the provided search results for a patent case involving US9647918. (Note: A search for this case number also yielded an unrelated case in the Northern District of Alabama).
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Likely 2025 (based on case number). Not explicitly available.
   • Outcome/Current Status: US case filed (implies pending/ongoing).

6. Case Number: 2:23-cv-00641

   • Plaintiff(s): Headwater Research LLC
   • Defendant(s): Samsung Electronics Co., Ltd., et al.
   • Jurisdiction: Texas Eastern District Court
   • Filing Date: Likely 2023 (based on case number). Not explicitly available.
   • Outcome/Current Status: US case filed (implies pending/ongoing). The case is active, with the defendant expected to disclose final invalidity theories by August 11, 2025.