Sentronics Sues Allengra Over F1 Fuel Flow Meter Patent Infringement

Former F1 fuel flow meter supplier Sentronics Holdings Ltd has initiated legal action against Allengra GmbH in the US District Court for the Western District of Texas. The British company alleges that the sensors currently utilized by every team in the championship infringe upon its patented ultrasonic measurement technology.

Why it matters:

Fuel flow meters are the FIA's primary tool for policing power output, ensuring no engine exceeds the technical regulations' fuel limits. While this legal battle is currently a corporate dispute, any potential court-ordered injunction against the supply of these parts in the U.S. could create significant regulatory headaches for the FIA and the teams during the American leg of the season.

The Details:

• Supplier Transition: Sentronics served as the FIA's exclusive supplier from 2018 through 2025, before Allengra secured the contract for the 2026-2030 period in November 2024.
• The Technology: The dispute centers on US patent 11,391,609, which covers ultrasonic flow meters that measure the propagation time of signals traveling with and against the fuel flow to determine the flow rate.
• Allegations of Willfulness: Sentronics claims it notified the FIA and Allengra of the infringement as early as 2025, asserting that Allengra deliberately chose to use the infringing design.
• Legal Demands: The lawsuit seeks a permanent ban on Allengra supplying the meters in the U.S., along with tripled damages for lost profits and royalties dating back to 2022.

What's next:

Despite the timing of the filing just before the United States Grand Prix in Austin, the race weekend remains unaffected. Sentronics has not requested an emergency ban, meaning the technical status quo will hold as the championship battle—highlighted by Kimi Antonelli's title quest—continues. The court is now expected to issue a summons to formally move the case forward.