Parker-Hannifin v. Testo: HVAC/R Smart Probe Patents Dismissed With Prejudice
Parker-Hannifin Corporation brought a patent infringement action against Testo, Inc. in the Western District of Pennsylvania, asserting two patents covering HVAC/R smart probe technology against Testo’s Smart Probes product line and companion app. After 996 days of litigation, the parties jointly stipulated to dismiss all claims and counterclaims with prejudice, each side bearing its own costs.
Smart probe IP clash ends in mutual walk-away after nearly three years
On 12 January 2022, Parker-Hannifin Corporation and its affiliate Parker Intangibles, LLC filed suit against Testo, Inc. (also known as Testo North America) and its German parent Testo SE & Co. KGaA in the Western District of Pennsylvania before Judge Kelley Brisbon Hodge. The complaint asserted infringement of US10739051B2 and US10281183B2 — two patents covering HVAC/R measurement and smart probe technology — against Testo’s Smart Probes HVAC/R Ultimate Kit, Refrigeration Set, and companion Smart Probe App.
The case concluded on 4 October 2024 when the parties filed a joint stipulation of voluntary dismissal with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(ii). The dismissal extinguishes all claims and counterclaims asserted by both sides. The with-prejudice designation means neither party may re-file the same claims arising from these patents against each other on the same products. Notably, each side agreed to bear its own attorneys’ fees and costs, suggesting a negotiated resolution rather than a court-imposed outcome.
At 996 days, this litigation ran substantially longer than a routine pre-trial settlement, suggesting the parties engaged in meaningful discovery and potentially claim construction proceedings before reaching resolution. The mutual cost-bearing arrangement and with-prejudice dismissal are consistent with a confidential settlement, though no settlement terms are visible in the public record. What drove the final resolution — whether licensing, design-around, or a commercial agreement — remains unknown from the docket alone.
Filing to Voluntary dismissal in 996 days
996 days — above the median duration for patent cases in W.D. Pennsylvania
Dismissed with prejudice: what the stipulated exit means for both parties
Rule 41(a)(1)(A)(ii): a joint, court-free exit door
A stipulated dismissal under FRCP 41(a)(1)(A)(ii) requires agreement from all parties who have appeared, needing no court order. Here, both Parker-Hannifin and Testo signed off, immediately closing the case. The with-prejudice designation means the dismissal operates as a final adjudication on the merits — Parker-Hannifin cannot reassert these specific patent claims against Testo on these products in a new action.
Permanent bar on re-filingWith prejudice: Parker-Hannifin’s enforcement door closes
Unlike a dismissal without prejudice — which preserves the right to refile — a with-prejudice dismissal permanently extinguishes the asserted claims. Parker-Hannifin cannot sue Testo again on US10739051B2 or US10281183B2 for the same accused products. This is a meaningful concession by the patent holder and is typically consistent with a negotiated settlement or licensing agreement reached off the record.
Claims permanently extinguishedTesto exits litigation without an invalidity ruling
Testo secured closure without a court finding of infringement, and the patents were not invalidated on the record. While Testo avoids any injunction or damages award, it did not obtain a formal invalidity or non-infringement judgment that could be used as precedent. Each party bearing its own costs suggests neither side extracted a decisive litigation win — the outcome is consistent with a commercial resolution.
No invalidity ruling securedHVAC/R smart probe IP remains live for the broader market
Because the case ended by stipulation rather than a merits ruling, US10739051B2 and US10281183B2 retain their full presumption of validity and remain enforceable against third parties. Competitors making or selling HVAC/R smart probes or diagnostic apps cannot rely on this dismissal as any indication of patent weakness. Parker-Hannifin’s freedom to assert these patents against other market participants is entirely unaffected.
Patents fully enforceable vs. third partiesFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Parker-Hannifin Corporation | Company | Industrial motion and control technology company — holder of US10739051B2 and US10281183B2Search in Eureka ↗ |
| Defendant | Testo, Inc. | Company | Testo, Inc. (Testo North America) and parent Testo SE & Co. KGaA — HVAC/R measurement instrument manufacturerSearch in Eureka ↗ |
| Plaintiff counsel | LAURA J. GENTILCORE | Attorney | Counsel for Parker-Hannifin CorporationSearch in Eureka ↗ |
| Plaintiff counsel | Matthew R. Lechner | Attorney | Counsel for Parker-Hannifin CorporationSearch in Eureka ↗ |
| Plaintiff counsel | RAY L. WEBER | Attorney | Counsel for Parker-Hannifin CorporationSearch in Eureka ↗ |
| Plaintiff law firm | Faegre Drinker Biddle & Reath, LLP | Law Firm | Representing Parker-Hannifin CorporationSearch in Eureka ↗ |
| Plaintiff law firm | RENNER, KENNER, GREIVE, BOBAK, TAYLOR & WEBER CO., L.P.A. | Law Firm | Representing Parker-Hannifin CorporationSearch in Eureka ↗ |
| Defendant counsel | Michael F. Snyder | Attorney | Counsel for Testo, Inc.Search in Eureka ↗ |
| Defendant counsel | RANDOLPH J. HUIS | Attorney | Counsel for Testo, Inc.Search in Eureka ↗ |
| Defendant counsel | RYAN WILLIAM O’DONNELL | Attorney | Counsel for Testo, Inc.Search in Eureka ↗ |
| Defendant law firm | Volpe & Koenig PC | Law Firm | Representing Testo, Inc.Search in Eureka ↗ |
| Presiding judge | Judge KELLEY BRISBON HODGE | Judge | Pennsylvania Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The stipulation explicitly names both the U.S. subsidiary (Testo, Inc. a/k/a Testo North America) and German parent (Testo SE & Co. KGaA) as defendants, confirming that the dismissal binds the entire Testo corporate family on these claims. The inclusion of ‘all claims and counterclaims’ language suggests Testo had filed defensive counterclaims — likely invalidity or non-infringement — which are also extinguished. The parties’ decision to resolve costs bilaterally, without court intervention, is consistent with a negotiated commercial settlement whose terms remain confidential.
US10739051B2 & US10281183B2 — HVAC/R smart probe measurement technology
US10739051B2 (application US16/357511) and US10281183B2 (application US14/913834) both sit within Parker-Hannifin’s portfolio covering intelligent field measurement for HVAC and refrigeration applications. These patents protect technology enabling wireless probes to acquire, transmit, and display real-time pressure, temperature, and system-state data — the core functionality of the Testo Smart Probes product line. US10281183B2’s earlier application date suggests it represents foundational refrigeration measurement IP, with US10739051B2 potentially extending coverage to wireless and app-integrated implementations.
For the HVAC/R instrumentation sector, connected smart probes represent a high-growth category as technicians shift from analogue gauges to app-driven diagnostics. Parker-Hannifin, through its Sporlan and instrumentation divisions, competes directly with Testo in this space, making these patents strategically significant beyond pure licensing revenue. Any manufacturer developing Bluetooth or Wi-Fi-enabled refrigerant probes, manifold replacements, or HVAC diagnostic apps should treat these patent families as active competitive IP requiring careful FTO assessment.
Should your team run an FTO against US10739051B2 and US10281183B2?
If your product roadmap includes wireless HVAC/R measurement probes, refrigerant diagnostic tools, or companion mobile applications that interface with smart sensors, both patents in this case are directly relevant. The fact that Parker-Hannifin pursued this litigation for nearly three years — and closed it with prejudice against Testo specifically — does not eliminate risk for other manufacturers. The patents remain fully in force and Parker-Hannifin has demonstrated willingness to litigate.
PatSnap Eureka’s FTO Search Agent can map your product’s technical features against the asserted claims of US10739051B2 and US10281183B2, identify any continuation or divisional applications in the Parker-Hannifin refrigeration measurement family, and surface prior art that could inform an invalidity challenge. R&D teams should run this analysis before finalising wireless communication architecture and sensor data-handling designs — the earlier in development, the lower the cost of design-around.
Run a freedom-to-operate analysis on US10739051B2 to assess your product’s exposure
Run FTO in Eureka →Similar HVAC/R instrumentation patent cases in U.S. district courts
Cases involving wireless HVAC/R measurement device patents in U.S. district courts, including W.D. Pennsylvania, with comparable infringement and smart probe technology claims.
What this case signals for the HVAC/R smart instrumentation IP landscape
A with-prejudice settlement after 996 days sends a clear message: Parker-Hannifin treats its smart probe patents as enforceable assets worth pursuing.
Parker-Hannifin’s smart probe patents survived — and remain live enforcement tools
Neither US10739051B2 nor US10281183B2 was invalidated or narrowed on the public record. Any HVAC/R manufacturer selling wireless smart probes or companion diagnostic apps should treat these patents as active infringement risks. The with-prejudice outcome does not weaken the patents against anyone other than Testo on the specific accused products.
Mutual cost-bearing signals a negotiated exit, not a plaintiff capitulation
When a patent holder voluntarily dismisses with prejudice and waives cost recovery, it typically signals a confidential business resolution — a license, cross-license, or market accommodation — rather than an admission of a weak case. Competitors should not misread the closure as evidence of unenforceable patents.
Parker-Hannifin v Testo — key questions answered
Parker-Hannifin Corporation sued Testo, Inc. for patent infringement in the Western District of Pennsylvania, asserting US10739051B2 and US10281183B2 against Testo’s Smart Probes HVAC/R products and app. After 996 days, the parties filed a joint stipulation of voluntary dismissal with prejudice under FRCP 41(a)(1)(A)(ii), with each party bearing its own costs. No merits ruling was issued.
A dismissal with prejudice operates as a final adjudication on the merits. Parker-Hannifin cannot re-file infringement claims against Testo or its parent Testo SE & Co. KGaA based on US10739051B2 or US10281183B2 for the same accused products. The dismissal is permanent and court-enforceable, though it does not affect Parker-Hannifin’s right to assert these patents against other defendants.
Yes. The patents were not adjudicated on their merits. No invalidity finding, claim construction order, or non-infringement ruling appears in the public record. Both patents retain their statutory presumption of validity under 35 U.S.C. § 282 and remain enforceable against any party other than Testo in relation to the specific accused products covered by the stipulation.
Mutual cost-bearing in a with-prejudice dismissal typically signals a negotiated commercial resolution — such as a licensing agreement or business settlement — rather than a litigation failure by either side. Under FRCP 41(a)(1)(A)(ii), parties have broad freedom to structure the terms of a stipulated dismissal. The public record does not disclose any settlement terms.
The complaint identified the Testo Smart Probes HVAC/R Ultimate Kit, the Testo Smart Probes Refrigeration Set (also marketed as the Kälte-Set), and the Testo Smart Probe App as the accused products. These represent Testo’s wireless, app-connected HVAC and refrigeration diagnostic instrument lines sold in the North American and European markets.
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