IBM vs. Zillow: Patent Infringement Case Dismissed After 1,338 Days
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📋 Case Summary
| Case Name | International Business Machines Corporation v. Zillow Group, Inc. and Zillow, Inc. |
| Case Number | 2:20-cv-01130 (W.D. Wash.) |
| Court | U.S. District Court for the Western District of Washington |
| Duration | Jul 2020 – Mar 2024 3 years 8 months |
| Outcome | Dismissed with Prejudice |
| Patents at Issue | |
| Accused Products | Zillow.com and Zillow’s mobile applications |
Case Overview
The Parties
⚖️ Plaintiff
One of the world’s most prolific patent holders, consistently ranking among the top USPTO patent recipients, known for its extensive IP licensing program.
🛡️ Defendant
Operates one of the most visited online real estate marketplace platforms in the U.S., including Zillow.com and associated mobile applications.
Patents at Issue
This litigation involved several patents covering web-based and software technologies applicable to online commerce, content presentation, and digital platform functionality, central to Zillow’s consumer-facing products.
- • US 7,543,234 — Web and mobile application technology
- • US 6,785,676 — Related web-based technology
- • US 10,115,168 — Digital platform functionality
- • US 6,778,193 — Web content presentation
- • US 9,569,414 — Online commerce features
- • US 7,072,849 — Additional consolidated claim
- • US 7,076,443 — Additional consolidated claim
- • US 8,315,904 — Additional consolidated claim
- • US 7,631,346 — Additional consolidated claim
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The Verdict & Legal Analysis
Outcome
The case (No. 2:20-cv-01130) was **dismissed with prejudice** as to all of IBM’s claims and **without prejudice** as to Zillow’s counterclaims, by joint stipulation on March 20, 2024. No damages were awarded, and no injunctive relief was granted. Each party bears its own costs, expenses, and attorney’s fees.
Key Legal Issues
The dismissal by stipulation suggests a negotiated resolution rather than a definitive court ruling on the merits. Key factors include prior dismissals of several of IBM’s claims due to successful invalidity challenges, unfavorable claim construction rulings, or IPR proceedings. The “without prejudice” dismissal of Zillow’s counterclaims preserves their ability to re-assert defenses in future proceedings, indicating a strategic concession from IBM. The case highlights the importance of attrition across multi-patent assertion portfolios and the strategic value of inter partes review (IPR) petitions and parallel USPTO proceedings as defense tools.
Freedom to Operate (FTO) Analysis
This case highlights critical IP risks in web and platform technology. Choose your next step:
📋 Understand This Case’s Impact
Learn about the specific risks and implications from this litigation.
- View all related patents in this technology space
- See which companies are most active in web technology patents
- Understand claim construction patterns
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High Risk Area
Web-based platforms & mobile apps
Many Related Patents
In web technology space
Proactive FTO
Crucial for digital platforms
✅ Key Takeaways
Stipulated dismissals with prejudice after years of litigation signal negotiated resolution or portfolio attrition, not necessarily plaintiff weakness at filing.
Search related case law →Monitor parallel Federal Circuit proceedings (e.g., *Rakuten v. IBM*) for precedential impact on active claims.
Explore precedents →Fed. R. Civ. P. 41(a)(1)(ii) dismissal mechanics allow strategic preservation of counterclaims without prejudice.
Understand dismissal rules →Frequently Asked Questions
The central patent in Case No. 2:20-cv-01130 was U.S. Patent No. 7,543,234. The consolidated litigation also involved U.S. Patent Nos. 6,785,676; 10,115,168; 6,778,193; 9,569,414; 7,072,849; 7,076,443; 8,315,904; and 7,631,346.
The case was dismissed by joint stipulation under Fed. R. Civ. P. 41(a)(1)(ii). IBM’s claims were dismissed with prejudice; Zillow’s counterclaims without prejudice. No public damages award or infringement finding was issued.
It reinforces that multi-patent assertion campaigns against digital platforms often resolve through attrition and negotiation rather than trial — and that parallel USPTO and Federal Circuit proceedings significantly influence district court outcomes.
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References
- PACER Case No. 2:20-cv-01130
- USPTO Patent Full-Text Database
- United States Court of Appeals for the Federal Circuit
- Cornell Legal Information Institute — Fed. R. Civ. P. 41
- PatSnap — IP Intelligence Solutions for Law Firms
This article is for informational purposes only and does not constitute legal advice. All case information is drawn from publicly available court records. For platform capabilities, visit PatSnap.