LONGi Green Energy vs. Jinko Solar: Solar Patent Dispute Ends in Dismissal
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📋 Case Summary
| Case Name | LONGi Green Energy Technology Co. Ltd. v. Jinko Solar |
| Case Number | 2:25-cv-00048 (E.D. Tex.) |
| Court | U.S. District Court for the Eastern District of Texas |
| Duration | Jan 2025 – Sep 2025 251 days |
| Outcome | Dismissed With Prejudice |
| Patents at Issue | |
| Accused Products | Jinko Solar’s high-efficiency photovoltaic modules including JKM390M-72HBL-V, JKM425N-54HL4-B, and broader line of monocrystalline silicon solar cells and modules. |
Case Overview
The Parties
⚖️ Plaintiff
One of the world’s largest monocrystalline silicon solar module manufacturers, holding a significant IP portfolio covering photovoltaic cell architecture, PERC technology, and high-efficiency module designs. Known for proactive IP enforcement.
🛡️ Defendant
Among the world’s top solar panel manufacturers, supplying utility-scale and commercial solar projects. Named Vietnam and Malaysia manufacturing entities as co-defendants, reflecting the multinational scope.
Patent at Issue
This case centered on U.S. Patent No. US9515214B2, covering innovations in monocrystalline silicon solar cell technology, enhancing photovoltaic conversion efficiency.
- • US9515214B2 — Innovations in monocrystalline silicon solar cell technology.
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The Verdict & Legal Analysis
Outcome
The Eastern District of Texas accepted the parties’ Joint Stipulation of Dismissal With Prejudice on September 25, 2025. This means LONGi cannot re-file these specific infringement claims against Jinko for the same patent and accused products, and each party bears its own costs, consistent with a private settlement.
Key Legal Issues
The case resolved before any substantive rulings on claim construction, validity, or infringement of US9515214B2 were made public. The dismissal with prejudice strongly suggests a private licensing or cross-licensing arrangement was reached, avoiding protracted litigation.
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⚠️ Freedom to Operate (FTO) Analysis: Solar IP Risks
This case highlights critical IP risks in solar cell design. Choose your next step:
📋 Understand Solar IP Landscape
Learn about the specific risks and implications from this litigation and broader solar IP.
- View all patents in this technology space
- See leading companies in solar cell patents
- Understand claim patterns for PERC/TOPCon
🔍 Check My Solar Product’s Risk
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- AI identifies potentially blocking patents (e.g., US9515214B2)
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High Risk Area
Monocrystalline silicon cell architecture
US9515214B2
Core patent in this case
Design-Around Options
Available for many cell structures
✅ Key Takeaways from LONGi v. Jinko Solar
For Patent Attorneys & Litigators
EDTX remains an effective venue for solar patent plaintiffs seeking early settlement leverage.
Search related case law →Rule 41(a)(1)(A)(ii) with-prejudice dismissals are strong indicators of substantive licensing resolutions.
Explore licensing precedents →For R&D Leaders & Product Teams
Commission FTO analysis covering US9515214B2 for any monocrystalline silicon cell or module product targeting U.S. distribution.
Start FTO analysis for my product →Early design-around investment for key cell architectures is significantly less costly than patent litigation defense.
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