BeSang v. Micron: Court Rules No Infringement in 3D Memory Patent Dispute
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📋 Case Summary
| Case Name | BeSang, Inc. v. Micron Technology, Inc. |
| Case Number | 2:23-cv-00028 (E.D. Tex.) |
| Court | U.S. District Court for the Eastern District of Texas |
| Duration | Jan 2023 – Sep 2025 2 years 8 months |
| Outcome | Defendant Win – No Infringement |
| Patents at Issue | |
| Accused Products | Micron’s Crucial & Micron SSD series (e.g., BX500, MX500, P3 Plus, P5 Plus, 1100, 2100AI/AT, 2200, 2300, 2450) |
Case Overview
The Parties
⚖️ Plaintiff
A patent assertion entity holding intellectual property directed at three-dimensional semiconductor memory architecture.
🛡️ Defendant
A Fortune 500 semiconductor manufacturer and global leader in DRAM, NAND flash, and solid-state storage.
Patents at Issue
This case involved U.S. Patent No. 7,378,702 B2, directed to three-dimensional semiconductor memory architecture. The pivotal element was the claim term “stackable add-on layer,” which became the central point of contention during claim construction proceedings.
- • US7,378,702 B2 — 3D semiconductor memory architecture with a “stackable add-on layer”
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The Verdict & Legal Analysis
Outcome
The court entered final judgment for Micron, finding that the accused SSD products do not infringe any claim of the ‘702 patent. No damages were awarded to BeSang, and injunctive relief was not granted. Micron’s counterclaims were dismissed without prejudice.
Key Legal Issues
The case hinged entirely on the claim construction of the term “stackable add-on layer”. The court’s interpretation of this critical term, central to BeSang’s claimed 3D memory architecture, excluded Micron’s products from the patent’s scope, leading to a finding of no literal infringement.
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⚠️ Freedom to Operate (FTO) Analysis in 3D Memory
This case highlights critical IP risks in 3D memory design. Choose your next step:
📋 Understand Litigation Impact in 3D NAND
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- Explore the 3D NAND patent landscape
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High Risk Area
3D memory architectures with vertical integration
Key Term Decisive
“Stackable add-on layer” construction crucial
Design-Around Options
Emphasis on structural differentiation
✅ Key Takeaways
For Patent Attorneys & Litigators
Claim construction of a single term — “stackable add-on layer” — drove total judgment for the defendant across all accused products.
Search related case law →Prosecution history is vital for supporting broad claim construction and avoiding restrictive judicial interpretations.
Explore precedents →For IP Professionals
Patent assertion entities targeting foundational architecture in maturing tech spaces (3D NAND) face increasing claim construction risk.
Explore 3D NAND IP landscape →FTO analyses in semiconductor memory should account for how courts — not just USPTO examiners — construe foundational architecture terms.
Start FTO analysis for my product →For R&D Leaders
Proactive design-around documentation and early FTO analysis are critical for new 3D memory designs.
Start FTO analysis for my product →Focus on structural differentiation from existing patents in layered memory architectures to mitigate litigation risk.
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