Legal case
This page summarizes known legal cases in which Parker Hannifin Corporation has been a party to disputes involving patents, trade secrets, product liability, and contract issues. The cases are presented with the most recent first and are based on public court documents and available sources.
2025 - Davidson Instruments, Inc. v. Parker-Hannifin Corporation
Court: US District Court for the Eastern District of Texas
Case Number: 2:25-cv-00520
Filed: May 12, 2025
Status: Pending
Background
Davidson Instruments develops fiber optic pressure measurement systems for jet engines, gas turbines and other high temperature environments. The technology is used to optimize combustion, reduce emissions and increase fuel efficiency.
Parker Hannifin has been working on similar sensor technology for a long time. According to Davidson, Parker failed to develop a working solution and instead became interested in Davidson's technology.
Allegations against Parker
Davidson accuses Parker Hannifin of having:
– obtained and exploited Davidson's trade secrets
– filed a patent application in 2024 based on Davidson's technology
– filed additional patent applications with the same technical content
– attempted to use these patents to block Davidson from the market
– violated US antitrust laws
– committed copyright infringement
– acted with the aim of controlling the market for fiber optic pressure measurement
Damage claim
Davidson is seeking at least $900 million in damages as well as a legal injunction against Parker's use of the disputed technology.
Process mode
The case is active. The court has:
– handled opening submissions
– handled attempts to have parts of the case dismissed
– appointed a mediator (Nancy F. Atlas)
– issued a protective order
– held several hearings in 2025
This makes the case one of the most extensive intellectual property cases Parker Hannifin has been involved in.
2010–2019 – Patent and contract disputes
The 2010s were characterized by technical patent disputes and contract cases where Parker Hannifin was a party to issues concerning:
– patent licenses in hydraulics and pneumatics
– technical solutions in valves and control systems
– supply agreements and component quality
– product liability cases where Parker components were included in larger systems
Most cases were settled or dismissed. Public details are limited, as is common in technical intellectual property disputes.
2000–2009 – Product responsibility and safety-related goals
During the 2000s, there were several cases in which Parker was sued for alleged errors in:
– hydraulic hoses
– brake components
– industrial couplings
– high-pressure systems
The cases often involved injuries or accidents involving Parker components in larger systems. Many cases were settled out of court and lack public verdicts.
1990–1999 – Early legal cases
During the 1990s, there were disputes in which Parker was involved:
– product liability cases in the automotive industry
– contract cases related to hydraulic deliveries
– technical disputes about design and strength
Here too, details are limited because many cases were resolved through settlement.
Summary
Parker Hannifin has historically been involved in a number of legal cases, primarily in:
– patents and intellectual property rights
– trade secrets
– product liability
– contract issues
The large and ongoing 2025 target is the most comprehensive and publicly documented. Older targets are often settlements with limited transparency, making the Davidson target particularly significant.
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