Texas Court Invalidates Progressive Cavity Patent as Indefinite
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📋 Case Summary
| Case Name | Infocus Downhole Solutions USA LLC v. Full-Metal-Power B.V. |
| Case Number | 2:24-cv-00875 (E.D. Tex.) |
| Court | U.S. District Court for the Eastern District of Texas |
| Duration | Oct 2024 – Jan 2026 1 year 3 months |
| Outcome | Defendant Win — Patent Invalidated |
| Patents at Issue | |
| Accused Products | Full-Metal-Power B.V.’s 2-7/8″ 9:10 Lobe 4.0 Stage Power Section |
Case Overview
The Parties
⚖️ Plaintiff
U.S.-based entity operating in the oilfield services sector, asserting IP rights over progressive cavity motor technology used in directional drilling.
🛡️ Defendant
Netherlands-incorporated company offering power section products for downhole drilling applications, including the accused Full Metal Power Section.
The Patent at Issue
This landmark case involved **U.S. Patent No. 10,676,992 B2** (Application No. 15/811,664), covering technology relating to progressive cavity motors. These devices are used in downhole drilling to convert hydraulic energy from drilling fluid into rotational power. The patent’s claims described specific geometric relationships between the stator and rotor components critical to forming an efficient pumping seal.
- • US 10,676,992 B2 — Progressive cavity power section for directional drilling operations.
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The Verdict & Legal Analysis
Outcome
The court entered judgment that all claims of U.S. Patent No. 10,676,992 are invalid as indefinite under 35 U.S.C. § 112. No damages were awarded to plaintiff. Defendant Full-Metal-Power B.V. was designated the prevailing party and is entitled to recover taxable costs.
Claim Construction Analysis
The Claim Construction Order addressed two terms:
- **”Defined between axial ends of the stator”** — construed to have its plain and ordinary meaning, a routine finding that did not affect validity.
- **”Sufficiently narrow clearance or negative interference fit with the rotor to form an efficient pumping seal without seizing the progressive cavity section in use”** — found indefinite.
The second finding is the legal crux. Under Nautilus, Inc. v. Biosig Instruments, Inc., 572 U.S. 898 (2014), a patent claim is indefinite if it fails to inform, with reasonable certainty, persons skilled in the art about the scope of the claimed invention. The term “sufficiently narrow” paired with a functional outcome — “without seizing” — creates a classic indefiniteness problem: it defines a dimension by reference to a desired result, not by a measurable standard. This finding cascades across all claims, rendering the entire patent unenforceable.
Legal Significance
This ruling reinforces a critical patent prosecution lesson: functional claim language describing geometric tolerances by reference to performance outcomes — without quantitative ranges, formulas, or objective test methods — is highly vulnerable under *Nautilus*. In the oilfield equipment space, where dimensional precision defines product performance, claim drafters frequently use performance-based descriptions. This case illustrates the invalidation risk that approach carries in litigation.
The consent to final judgment without objection also reflects a strategic reality: litigating claim construction findings through objections and potential appeals is costly and uncertain. When an indefiniteness finding is well-grounded, accepting finality can be the rational choice.
Freedom to Operate (FTO) Analysis
This case highlights critical IP risks in oilfield equipment design. Choose your next step:
📋 Understand This Case’s Impact
Learn about the specific risks and implications from this litigation.
- View all 200+ related patents in downhole drilling technology
- See which companies are most active in progressive cavity motors
- Understand indefiniteness challenges in functional claims
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High Risk Area
Functional claims without objective metrics
200+ Related Patents
In downhole drilling space
Clarity Improves Defensibility
Objectively defined claims are stronger
✅ Key Takeaways
Indefiniteness under § 112 (per *Nautilus*) remains a decisive validity defense — prioritize claim construction strategy early.
Search related case law →Functional dimensional terms (“sufficiently narrow”) without objective metrics are high-risk in prosecution and litigation.
Explore precedents →Frequently Asked Questions
U.S. Patent No. 10,676,992 B2 (Application No. 15/811,664), covering progressive cavity motor technology for downhole drilling applications.
The court found the claim term “sufficiently narrow clearance or negative interference fit…without seizing” indefinite under 35 U.S.C. § 112, as it failed to provide objective, measurable scope to persons skilled in the art.
It signals that functional tolerance claims lacking quantitative anchors are vulnerable to invalidation — influencing both prosecution strategy and defense approaches in oilfield equipment patent disputes.
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References
- PACER — Case No. 2:24-cv-00875 (E.D. Tex.)
- USPTO Patent Full-Text Database — U.S. Patent No. 10,676,992 B2
- Cornell Legal Information Institute — Nautilus, Inc. v. Biosig Instruments, Inc.
- Cornell Legal Information Institute — 35 U.S.C. § 112
- 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.