Untitled case

This patent infringement litigation, case number 1:21-cv-00634 in the North Carolina Middle District Court, involves plaintiff CAO Lighting, Inc. and defendants including Cree, Inc., which is now Wolfspeed, Inc. CAO Lighting, Inc. is characterized as a patent assertion entity (PAE) active in the LED lighting intellectual property space, despite its parent company, Cao Group, primarily focusing on dental products. Cree, Inc. (now Wolfspeed, Inc.) is a prominent American developer and manufacturer of wide-bandgap semiconductors, specializing in silicon carbide materials and devices for power applications in industries like electric vehicles and power supplies, and was historically a significant player in LED lighting products. The asserted patent is U.S. Patent No. 6,465,961, titled "Semiconductor Light Source Using a Heat Sink with a Plurality of Panels." This patent describes a semiconductor light source, specifically for LED lamp architecture, that incorporates heat sink technology with multiple panel configurations for thermal management. The accused products in this and related litigations are LED lighting products, particularly those utilizing allegedly infringing LED chips.

The procedural posture of this case is notable due to related inter partes review (IPR) proceedings and subsequent appellate review. While the specific judge for the district court case in the Middle District of North Carolina is not explicitly identified in public search results, the district is known to have local patent rules. Crucially, the '961 patent has been the subject of IPRs, including IPR2022-00847, initiated by Wolfspeed, Inc. and others against CAO Lighting, Inc. These IPRs culminated in a final written decision finding claims of the '961 patent unpatentable, a decision which was subsequently affirmed by the U.S. Court of Appeals for the Federal Circuit on September 5, 2025. This Federal Circuit ruling, which affirmed the invalidity of US6465961B1, was a per curiam judgment in a consolidated appeal involving a coalition of major LED manufacturers, including Wolfspeed (formerly Cree), General Electric, Osram Sylvania, and Feit Electric.

This case is notable for several reasons. Primarily, it highlights the assertion patterns of CAO Lighting, Inc. as a non-practicing entity engaged in extensive patent litigation against numerous major players in the LED lighting industry. The invalidation of the key asserted patent, US6465961B1, by the Federal Circuit has significant industry impact, demonstrating that validity challenges, particularly through IPRs, remain a powerful defense weapon for well-resourced defendants in technology-focused patent disputes. Although some reports indicate the specific district court dispute (1:21-cv-00634 in MDNC) against Cree/Wolfspeed was "favorably settled and dismissed prior to deadline to file a Preliminary Response," likely influenced by the ongoing IPRs, the ultimate invalidation of the patent at the Federal Circuit level effectively resolves the broader enforceability of this patent against any alleged infringers.

The patent infringement litigation concerns CAO Lighting, Inc. v. Cree, Inc. et al., Case No. 1:21-cv-00634, in the U.S. District Court for the Middle District of North Carolina, involving U.S. Patent No. 6,465,961.

Here are the key legal developments and outcome for this specific patent infringement litigation:

Filing & Initial Pleadings:

• Complaint Filed: CAO Lighting, Inc. initiated the lawsuit against Cree, Inc. et al. in the Middle District of North Carolina. While the exact filing date of the initial complaint isn't immediately available, related filings mention it as "filed 12th Aug 2021" in some contexts, or "filed 03/10/21" in another, though the latter appears to be a different case with the same number. Given the context of patent 6,465,961, the August 2021 timeframe seems more consistent with the patent litigation context. The technology involved in the litigation relates to LED-based light bulbs, LED chips, and associated components.

Pre-trial Motions of Substance:

• Stay Pending IPR: The case in the Middle District of North Carolina was stayed at some point.

Claim Construction (Markman) Outcomes:

• Specific Markman outcomes for this particular case (1:21-cv-00634 M.D.N.C.) are not explicitly detailed in the provided search results. However, there is a mention that "the U.S. District Court for the District of Delaware held, with respect to related U.S. Patent 6,465,961, construed 'a light emitting diode (LED) chip configured to output light at greater than about 40 milliwatts' as 'at least one LED chip is capable of emitting light greater than about 40 milliwatts'." It is unclear how this related construction influenced the North Carolina case.

Discovery Milestones with Strategic Significance:

• A Patent Owner Claim Chart for U.S. Patent No. 6,465,961 C2 was filed on April 7, 2022. This is a significant discovery milestone as it outlines the patent owner's infringement theories.

Trial Events, Verdict, and Post-trial Motions:

• There is no indication that this specific case reached a trial or verdict. A separate, related case involving CAO Lighting, Inc. against General Electric Co. et al. (C.A. No. 1:20-cv-00681-GBW) in the District of Delaware did go to trial, with a jury verdict entered on February 17, 2023, and that case was also stayed.

Settlement, Dismissal, Judgment, or Appeal:

• The dispute was "favorably settled and dismissed prior to deadline to file a Preliminary Response" in an Inter Partes Review (IPR) proceeding, which would have impacted the district court litigation. This suggests that the district court case likely concluded with a dismissal due to this settlement.

Parallel PTAB IPR/PGR Proceedings:

• IPR2022-00847: Wolfspeed, Inc. et al. filed an Inter Partes Review (IPR) against CAO Lighting, Inc. et al. on April 7, 2022, challenging US Patent 6,465,961.
• Effect on Litigation: The IPR proceeding and the district court case appear to have been closely related. Kilpatrick Townsend & Stockton LLP, representing Cree Lighting in the district court case, also represented the Patent Owner (CAO Lighting) in the IPR. The IPR dispute "favorably settled and dismissed prior to deadline to file a Preliminary Response." This pre-institution settlement of the IPR likely led to the dismissal of the parallel district court litigation against Cree, Inc. et al., as is often the case when patentability challenges are resolved at the PTAB.The patent infringement litigation CAO Lighting, Inc. v. Cree, Inc. et al., Case No. 1:21-cv-00634 in the U.S. District Court for the Middle District of North Carolina, involved U.S. Patent No. 6,465,961.

Here's a chronological summary of the key legal developments and outcome:

Filing & Initial Pleadings:

• Complaint Filed: CAO Lighting, Inc. filed a patent infringement lawsuit against Cree, Inc. et al. in the Middle District of North Carolina on August 12, 2021. The defendants included Cree Lighting, USA LLC (formerly Ideal Industries Lighting LLC) and Wolfspeed, Inc. The asserted patent, U.S. Patent No. 6,465,961, pertains to semiconductor light sources, specifically LED-based light bulbs and their components, including heat sink technology.

Pre-trial Motions of Substance:

• Motion to Stay: The district court case was stayed. This often occurs when parallel proceedings, such as Inter Partes Reviews (IPRs) at the Patent Trial and Appeal Board (PTAB), are initiated to challenge the validity of the asserted patent.
• Patent Owner Claim Chart: A Patent Owner Claim Chart for U.S. Patent No. 6,465,961 C2 was filed on April 7, 2022, which is a standard discovery milestone outlining the patent owner's infringement contentions.

Claim Construction (Markman) Outcomes:

• Specific Markman rulings for this case in the Middle District of North Carolina are not detailed in the available information. However, a related case in the District of Delaware concerning U.S. Patent No. 6,465,961 did involve claim construction, with the term "a light emitting diode (LED) chip configured to output light at greater than about 40 milliwatts" construed as "at least one LED chip is capable of emitting light greater than about 40 milliwatts". A separate Federal Circuit decision in CAO Lighting, Inc. v. Feit Electric Co., Inc. (Case No. 23-1906, Fed. Cir. Oct. 16, 2024), also related to the '961 patent, reversed a district court's claim construction for narrowing a term based on a preferred embodiment.

Discovery Milestones with Strategic Significance:

• Beyond the filing of the Patent Owner Claim Chart, specific significant discovery milestones with strategic impact are not publicly detailed for this particular case.

Trial Events, Verdict, and Post-trial Motions:

• This case did not proceed to trial. Information indicates it was settled and dismissed. A separate case involving CAO Lighting, Inc. against General Electric Co. et al. (C.A. No. 1:20-cv-00681-GBW) in the District of Delaware, also involving the '961 patent, did go to a jury trial with a verdict entered on February 17, 2023, and that case was subsequently stayed.

Settlement, Dismissal, Judgment, or Appeal:

• The litigation in the Middle District of North Carolina was "favorably settled and dismissed prior to deadline to file a Preliminary Response" in an Inter Partes Review (IPR) proceeding. This suggests a settlement was reached between CAO Lighting and the defendants (including Cree/Wolfspeed) in conjunction with or due to the IPR process, leading to the dismissal of the district court case.

Parallel PTAB IPR/PGR Proceedings on the Asserted Patents and their Effect on the Litigation:

• IPR2022-00847: On April 7, 2022, Wolfspeed, Inc. et al. (including Cree Lighting USA LLC) filed an Inter Partes Review petition (IPR2022-00847) challenging claims of U.S. Patent No. 6,465,961. Kilpatrick Townsend & Stockton LLP represented Cree Lighting USA LLC and Wolfspeed, Inc. in this IPR.
• Additional IPRs: Other related IPRs, IPR2023-00123 and IPR2023-00129, were also filed against the '961 patent, relying on similar grounds and arguments.
• PTAB Final Written Decisions: The Patent Trial and Appeal Board (PTAB) issued Final Written Decisions in IPR2022-00847 and IPR2022-00848 on September 28, 2025, finding claims 21, 22, 25, 26, 28-30, 32-36, 40, 42-44, 47-49, 52, 53, 56-59, 62, 63, 65-68, 71-73, 77, 78, 81, 82, 85, 86, and 88-91 of the '961 patent unpatentable.
• Federal Circuit Appeal: CAO Lighting, Inc. appealed the PTAB's decisions regarding IPR2022-00847 and IPR2022-00848 to the Federal Circuit (Appeal Nos. 2024-1194, 2024-1221, 2024-1222, 2024-1223). On September 5, 2025, the Federal Circuit summarily affirmed the PTAB's Final Written Decisions under Rule 36, meaning no reversible error was found in the PTAB's unpatentability findings for U.S. Patent No. 6,465,961. The Federal Circuit denied rehearing and rehearing en banc on November 6, 2025, and the mandate was issued on November 13, 2025.
• Effect on Litigation: The favorable settlement and dismissal of the district court case prior to a preliminary response in the IPR indicates that the defendants' challenge to the patent's validity at the PTAB played a significant role in resolving the district court litigation. The subsequent affirmance of unpatentability by the Federal Circuit has ultimately extinguished CAO Lighting's enforcement path for the invalidated claims of US6465961.

Counsel of Record for Plaintiff CAO Lighting, Inc.

The plaintiff in the patent infringement case 1:21-cv-00634 in the North Carolina Middle District Court is CAO Lighting, Inc.. As of the current date, the specific counsel of record representing CAO Lighting, Inc. in this particular case could not be definitively identified through the conducted web searches of publicly available information. Filings related to attorney appearances for the plaintiff were not explicitly detailed in the search results, which frequently focused on the defendants or other cases involving different plaintiffs.

Further investigation, potentially directly through PACER with a subscription or a more detailed docket review, would be necessary to identify the plaintiff's legal representation, their roles, firms, and relevant experience in this specific patent litigation.

In the patent infringement case 1:21-cv-00634, CAO Lighting, Inc. v. Wolfspeed, Inc., et al., filed in the North Carolina Middle District Court, the defendants included a consortium of lighting manufacturers. The defendants involved in the district court action and subsequent appeal to the Federal Circuit were Wolfspeed, Inc., Cree Lighting USA LLC f/k/a Ideal Industries Lighting LLC, LEDvance LLC, General Electric Company, Consumer Lighting (U.S.), LLC dba GE Lighting, Current Lighting Solutions, LLC, Osram Sylvania, Inc., and Feit Electric Company, Inc..

Based on Federal Circuit filings and related case information, the following counsel represented the defendants:

Counsel of Record for Defendant(s)

For Wolfspeed, Inc. and Cree Lighting USA LLC f/k/a Ideal Industries Lighting LLC:

• John C. Alemanni
  • Role: Lead Counsel (argued for all cross-appellants at the Federal Circuit).
  • Firm: Kilpatrick Townsend & Stockton LLP, Raleigh, NC.
  • Experience Note: Represents Ideal Industries in patent infringement defense, successfully invalidating claims in IPRs related to light-emitting electrode lighting devices. Served as lead counsel for Google Inc. in IPRs challenging digital content processing patents and represented Celgard LLC in an IPR related to lithium batteries.
• Matias Ferrario
  • Role: Counsel
  • Firm: Kilpatrick Townsend & Stockton LLP, Winston-Salem, NC
  • Experience Note: Likely specializes in intellectual property litigation given the firm's role and his appearance in this patent case.
• Andrew N. Saul
  • Role: Counsel
  • Firm: Kilpatrick Townsend & Stockton LLP, Atlanta, GA
  • Experience Note: Involved in patent litigation, appearing with Kilpatrick Townsend, a firm known for its IP practice.

For Consumer Lighting (U.S.), LLC dba GE Lighting, Current Lighting Solutions, LLC, General Electric Company, and LEDvance LLC:

• Kevin P. Martin
  • Role: Lead Counsel
  • Firm: Goodwin Procter LLP, Boston, MA.
  • Experience Note: Represents major lighting manufacturers in patent litigation.
• Brian Drummond
  • Role: Counsel
  • Firm: Goodwin Procter LLP
  • Experience Note: Appears on behalf of the defendant group, indicating patent litigation experience.
• Srikanth K. Reddy
  • Role: Counsel
  • Firm: Goodwin Procter LLP
  • Experience Note: Involved in representing the defendant group in this patent dispute.
• Sanjeet Dutta
  • Role: Counsel
  • Firm: Goodwin Procter LLP, Redwood City, CA.
  • Experience Note: Contributed to the defense strategy in this significant patent case.
• Catherine Garza
  • Role: Counsel
  • Firm: Norton Rose Fulbright US LLP, Austin, TX.
  • Experience Note: Represented GE Lighting and Current Lighting in the district court alongside Brooks Kushman, notably assisting with damage control in the trial where a $2 million jury verdict was awarded against them, down from $50 million sought by CAO Lighting.
• Arthur P. Licygiewicz
  • Role: Counsel
  • Firm: Norton Rose Fulbright US LLP, Dallas, TX.
  • Experience Note: Served as counsel for General Electric Company and Consumer Lighting (U.S.), LLC.
• Frank A. Angileri
  • Role: Counsel
  • Firm: Brooks Kushman PC, Royal Oak, MI.
  • Experience Note: Represented Current Lighting Solutions, LLC, and worked with Norton Rose Fulbright in the district court.
• Thomas W. Cunningham
  • Role: Counsel
  • Firm: Brooks Kushman PC, Royal Oak, MI.
  • Experience Note: Represented Current Lighting Solutions, LLC, in the patent infringement proceedings.
• John P. Rondini
  • Role: Counsel
  • Firm: Brooks Kushman PC, Royal Oak, MI.
  • Experience Note: Assisted in the defense of Current Lighting Solutions, LLC.

For Osram Sylvania, Inc.:

• Mark A. Hannemann
  • Role: Counsel
  • Firm: Troutman Pepper Locke LLP, New York, NY.
  • Experience Note: Represented Osram Sylvania, Inc. in this patent litigation.

For Feit Electric Company, Inc.:

• Counsel information specifically for Feit Electric Company, Inc. from the provided search results is not as detailed as for the other defendants. However, as Feit Electric Company, Inc. is listed as a cross-appellant (defendant) in the Federal Circuit case, they would have been represented by counsel. The general listing of Kevin P. Martin from Goodwin Procter LLP as lead counsel for a group of cross-appellants including Feit Electric suggests that Goodwin Procter LLP may have represented Feit Electric along with other defendants in that appeal. Further search would be needed to definitively identify lead counsel at the district court level for Feit specifically if they had separate representation.