Federal Circuit Affirms Co-Inventor Rights in Gas Cylinder Transport Patent Dispute: Campbell v. TUBE-MAC Industries
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📋 Case Summary
| Case Name | Campbell v. TUBE-MAC Industries, Inc. |
| Case Number | 22-2170 (Fed. Cir.) |
| Court | Federal Circuit, Appeal from District Court |
| Duration | Aug 2022 – Mar 2024 562 days |
| Outcome | Co-Inventorship Affirmed |
| Patents at Issue | |
| Accused Products | Methods of fabricating Type 4 cylinders and transportation housings for gaseous fluids |
Case Overview
The Parties
⚖️ Plaintiff
Individual plaintiff asserting sole inventorship rights over patents relating to Type 4 composite cylinder technology.
🛡️ Defendant
Established industrial manufacturer contesting Campbell’s sole inventorship claim, with operations in pressure piping and fluid conveyance systems. Individual defendants Gary Mackay and Dan Hewson were affirmed as co-inventors.
The Patents at Issue
Two patents covering methods of fabricating and arranging Type 4 cylinders for gaseous fluid transport were central to this dispute. Type 4 cylinders are critical for hydrogen transport, clean energy, and industrial gas applications.
- • U.S. Patent No. 9,376,049 — Method of fabricating Type 4 cylinders and arranging them in transportation housings.
- • U.S. Patent No. 9,965,780 — Related continuation covering similar subject matter.
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The Verdict & Legal Analysis
Outcome
The Federal Circuit **affirmed** the district court’s decision, confirming that **Gary Mackay and Dan Hewson are co-inventors on U.S. Patent No. 9,376,049**. The court found Campbell’s remaining arguments unpersuasive, issuing a straightforward affirmance without remand.
Key Legal Issues
The Federal Circuit’s analysis focused on the critical ‘inventorship question’ under 35 U.S.C. § 256, evaluating whether individuals contributed to the conception of at least one claim. The court reinforced the ‘clear and convincing evidence’ standard required to overturn inventorship determinations on appeal, underscoring the demanding evidentiary burden in such disputes.
Inventorship & Patent Ownership Analysis
This case highlights critical IP risks in Type 4 cylinder technology and collaborative development. 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 Type 4 cylinder IP
- Understand inventorship claim patterns
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Inventorship Challenges
Collaborative development creates risks
Related Patents
In Type 4 cylinder space
Clear IP Agreements
Essential for risk mitigation
✅ Key Takeaways
Inventorship determinations require *clear and convincing evidence* to disturb on appeal — build the evidentiary record at the district court level.
Search related case law →Co-inventorship under § 256 turns on conceptual contribution to at least one claim; reduction-to-practice contributions alone are insufficient.
Explore precedents →Pro se patent appellants face significant structural disadvantages before the Federal Circuit, reinforcing the value of specialized counsel.
Understand appellate strategy →Audit inventorship records on patents developed in collaborative or multi-party environments, particularly in clean energy and industrial manufacturing sectors.
Assess my portfolio’s risk →Co-inventor status creates independent licensing rights — a material consideration in M&A due diligence and portfolio transactions.
Learn more about licensing →Early IP ownership agreements in joint development relationships are essential risk management tools to prevent future disputes.
View agreement templates →Frequently Asked Questions
The case centered on U.S. Patent No. 9,376,049 (App. No. 14/239,938) and U.S. Patent No. 9,965,780 (App. No. 15/688,566), both covering methods of fabricating Type 4 cylinders for gaseous fluid transport.
The court found that Mackay and Hewson qualified as co-inventors on the ‘049 patent based on their conceptual contributions, and that Campbell failed to present persuasive arguments sufficient to overcome the district court’s findings under the clear-and-convincing evidence standard.
The decision reinforces that collaborative industrial development creates shared inventorship exposure. Companies in composite cylinder and hydrogen transport sectors should proactively audit inventorship documentation and implement robust IP ownership agreements in joint development contexts.
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References
- United States Court of Appeals for the Federal Circuit — Case 22-2170 (Campbell v. TUBE-MAC Industries, Inc.)
- USPTO Patent Public Search
- PACER — Federal Circuit Docket Records (Case No. 22-2170)
- Cornell Legal Information Institute — 35 U.S.C. § 256
- 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.