DRB Systems v. Sonny’s Enterprises: SmartSTOP Patent Dispute Ends With Prejudice
DRB Systems filed suit against car-wash equipment rival Sonny’s Enterprises in Delaware, asserting US11127283B2 covering the SmartSTOP Anticollision System. After 795 days of litigation, the parties jointly stipulated to dismiss all claims and counterclaims with prejudice — closing the door to any refiling.
A 795-day Delaware patent battle over car-wash anticollision IP ends by agreement
On 31 August 2023, DRB Systems, LLC — a provider of car-wash management technology — filed an infringement action against Sonny’s Enterprises, LLC in the District of Delaware, asserting US11127283B2, a patent covering the SmartSTOP Anticollision System designed to prevent vehicle collisions within automated car-wash conveyors. Sonny’s Enterprises is one of the largest manufacturers of car-wash equipment in North America, making it a commercially significant adversary for DRB in a competitive and consolidating market.
The case closed on 3 November 2025 when both parties, through their respective counsel, filed a joint stipulation of dismissal with prejudice under Fed. R. Civ. P. 41(a)(1)(A)(ii) and 41(c). Notably, the stipulation expressly covered not only the plaintiff’s infringement claims but also all counterclaims asserted by Sonny’s — including potential counterclaims subject to a pending motion for leave to amend. Dismissal with prejudice is a final adjudication on the merits, legally barring either party from relitigating the same claims in any future action.
The case ran for approximately 795 days before resolution, suggesting meaningful substantive activity — likely including claim construction proceedings and potentially inter partes review filings — before the parties reached agreement. The public record does not disclose whether a financial settlement accompanied the stipulation, what licensing terms (if any) were negotiated, or which party’s litigation position motivated the joint dismissal. The with-prejudice designation, combined with the bilateral scope of the stipulation, is consistent with a negotiated resolution rather than a unilateral capitulation by either side.
Filing to Dismissed with Prejudice in 795 days
795 days in litigation — above the median for Delaware District patent cases
Dismissed with prejudice: what the stipulated termination means for both parties
Rule 41 with prejudice: a permanent close on all claims
Under Fed. R. Civ. P. 41(a)(1)(A)(ii), a plaintiff may voluntarily dismiss an action by filing a stipulation signed by all parties. Where, as here, the dismissal is expressly with prejudice, it operates as a final adjudication on the merits. Rule 41(c) extends the same effect to counterclaims. Neither DRB nor Sonny’s may reassert the same infringement or invalidity claims in a subsequent action — the litigation chapter on these specific claims is permanently closed.
Permanent — no refiling permittedDRB Systems surrenders infringement claims but retains the patent
DRB Systems’ infringement claims against Sonny’s are extinguished with prejudice — meaning DRB cannot pursue the same theory of infringement against Sonny’s for the conduct at issue. However, US11127283B2 itself remains in force and enforceable against third parties. If DRB secured a licensing arrangement as part of a settlement, the with-prejudice dismissal would be the expected procedural vehicle. The absence of a public damages award does not necessarily indicate DRB received nothing.
Patent survives; claims against Sonny’s closedSonny’s counterclaims — including proposed amendments — also dismissed
The stipulation explicitly disposed of Sonny’s counterclaims, including those contemplated in a pending motion for leave to amend. This breadth is commercially significant: any invalidity or non-infringement counterclaims Sonny’s had asserted or planned to assert are now also dismissed with prejudice. Sonny’s cannot use this litigation as a vehicle to challenge the validity of US11127283B2 in future proceedings based on these same grounds, though separate IPR petition routes at the USPTO may remain available depending on timing and estoppel analysis.
Counterclaims extinguished with prejudiceSmartSTOP IP position strengthened for enforcement against the wider market
A with-prejudice dismissal following 795 days of active litigation — without a finding of invalidity — leaves US11127283B2 intact and publicly tested. For other car-wash equipment manufacturers operating in the anticollision sensor and conveyor safety space, this outcome suggests DRB is willing to litigate and that the patent survived a well-resourced adversary’s scrutiny. Competitors and investors in automated car-wash technology should treat this patent as an active enforcement risk and consider FTO analysis accordingly.
US11127283B2 remains enforceableFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | DRB Systems, LLC | Company | Car-wash management technology company — holder of US11127283B2Search in Eureka ↗ |
| Defendant | Sonny’s Enterprises, LLC | Company | Sonny’s Enterprises, LLC — major North American car-wash equipment manufacturerSearch in Eureka ↗ |
| Plaintiff counsel | Ahimsa E. Hodari | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Angela Whitesell | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Brian A. Biggs | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Joseph Wolfe | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Leon Medzhibovsky | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Matthew Ganas | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Meera Midha | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Richard T. Mulloy | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Stephanie E. O’Byrne | Attorney | Counsel for DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff law firm | DLA Piper LLP | Law Firm | Representing DRB Systems, LLCSearch in Eureka ↗ |
| Plaintiff law firm | DLA Piper LLP (US) | Law Firm | Representing DRB Systems, LLCSearch in Eureka ↗ |
| Defendant counsel | Benjamin J. Schladweiler | Attorney | Counsel for Sonny’s Enterprises, LLCSearch in Eureka ↗ |
| Defendant counsel | Danielle Z. Mills | Attorney | Counsel for Sonny’s Enterprises, LLCSearch in Eureka ↗ |
| Defendant counsel | Elana B. Araj | Attorney | Counsel for Sonny’s Enterprises, LLCSearch in Eureka ↗ |
| Defendant counsel | Jonathan Presvelis | Attorney | Counsel for Sonny’s Enterprises, LLCSearch in Eureka ↗ |
| Defendant counsel | Scott J. Bornstein | Attorney | Counsel for Sonny’s Enterprises, LLCSearch in Eureka ↗ |
| Defendant law firm | Greenberg Traurig LLP | Law Firm | Representing Sonny’s Enterprises, LLCSearch in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The stipulation’s language is notably comprehensive: it does not merely dismiss the complaint but expressly encompasses ‘all claims and counterclaims asserted in this action, including the potential counterclaims subject to Defendant’s motion for leave to amend.’ This drafting forecloses future litigation between these parties on both the infringement and invalidity fronts. The with-prejudice designation under Rules 41(a)(1)(A)(ii) and 41(c) gives the dismissal the legal weight of a final judgment on the merits, without any court finding as to liability or patent validity.
US11127283B2 — SmartSTOP Anticollision System for car-wash conveyors
US11127283B2 (application no. US15/659292) protects technology underlying the SmartSTOP Anticollision System — an automated collision-prevention mechanism designed for use in car-wash conveyor environments. The patent covers systems and methods for detecting vehicles or obstructions within a wash conveyor and triggering stop or alert responses to prevent equipment damage and personal injury. This places it squarely within the industrial automation and machine-safety technology domain, an area of growing IP activity as car-wash operators automate at scale.
For car-wash equipment manufacturers, the strategic significance of US11127283B2 is considerable. DRB Systems competes directly with Sonny’s Enterprises — and the willingness to litigate this patent in Delaware for over two years signals an enforcement-first IP posture. Companies developing conveyor control systems, proximity sensors, vehicle detection arrays, or PLC-based safety interlocks for car-wash applications face real design-around pressure. The patent’s survival without an invalidity ruling reinforces its commercial leverage across the sector.
Should you run an FTO analysis against US11127283B2?
Any company designing, manufacturing, or integrating anticollision or vehicle-stop technology for automated car-wash conveyor systems should treat US11127283B2 as a live FTO risk. This includes OEM conveyor manufacturers, safety sensor integrators, POS/management software providers with hardware interfaces, and aftermarket retrofit suppliers. The patent has now weathered litigation against a major industry player without an invalidity finding — a materially stronger enforcement posture than an untested patent.
PatSnap Eureka’s FTO Search Agent allows R&D and product teams to map their specific technical implementations — vehicle detection logic, conveyor stop mechanisms, sensor arrays — against the claim scope of US11127283B2 and related family members. Eureka can surface prior art, identify design-around opportunities, and flag continuation or divisional applications that may extend DRB’s coverage. Run your FTO analysis before your next product release, not after a cease-and-desist letter arrives.
Run a freedom-to-operate analysis on US11127283B2 to assess your product’s exposure
Run FTO in Eureka →Similar car-wash and conveyor safety patent cases in Delaware District Court
Explore related patent infringement actions involving car-wash equipment, conveyor safety technology, and anticollision systems filed in Delaware District Court.
What this case signals for the car-wash technology IP landscape
A well-funded bilateral dispute over anticollision IP in a consolidating market carries lessons beyond the two named parties.
With-prejudice dismissals after extended litigation often signal a negotiated exit
When both parties jointly stipulate to dismiss all claims and counterclaims with prejudice after nearly 800 days of litigation, the most commercially rational explanation is a negotiated resolution — likely including a licensing arrangement or covenant not to sue. IP teams tracking this space should note that the absence of a public damages record does not mean DRB received no value from the litigation.
US11127283B2 remains live — and has now survived adversarial scrutiny
No invalidity finding was entered against US11127283B2. For car-wash equipment manufacturers and adjacent conveyor safety technology companies, this patent’s survival through 795 days of litigation with Sonny’s — one of the sector’s largest players — materially elevates its perceived strength. Any product incorporating anticollision detection or vehicle-stop mechanisms in a conveyor wash environment warrants FTO review against this patent.
DRB v Sonny’s — key questions answered
The dismissal with prejudice means all infringement claims by DRB Systems and all counterclaims by Sonny’s Enterprises — including those contemplated in Sonny’s pending amendment motion — are permanently extinguished. Neither party may relitigate these claims. The dismissal was entered by joint stipulation under Fed. R. Civ. P. 41(a)(1)(A)(ii) and 41(c), giving it the legal force of a final judgment on the merits without any judicial liability finding.
Yes. The dismissal with prejudice terminated the litigation between DRB and Sonny’s but did not invalidate US11127283B2. The patent remains in force and enforceable against third parties. No court entered an invalidity finding, and no inter partes review outcome is reflected in the public case record. Third parties in the car-wash equipment space should treat the patent as an active enforcement risk.
Delaware is a preferred venue for many patent plaintiffs due to its sophisticated patent docket, predictable procedural timelines, and experienced judiciary. Plaintiffs like DRB Systems frequently file in Delaware against out-of-state defendants where Delaware jurisdiction is legally established — typically through incorporation or registered-agent presence. This venue choice is consistent with a deliberate enforcement strategy rather than a convenience filing.
Based on the patent record, the SmartSTOP Anticollision System relates to automated vehicle detection and collision-prevention technology for car-wash conveyor environments. The system is designed to detect vehicles or obstructions and trigger stop or alert responses to prevent collisions and equipment damage. The patent (application no. US15/659292) falls within the broader industrial automation and machine-safety technology domain.
Potentially, but with complications. The with-prejudice dismissal of Sonny’s counterclaims — including invalidity claims — in district court creates litigation estoppel against relitigating those same invalidity grounds in a new court action. However, whether IPR estoppel under 35 U.S.C. § 315(e) applies depends on whether Sonny’s filed or was a real party in interest to any IPR petition. A separate IPR petition raising different grounds may still be theoretically available, subject to time-bar and estoppel analysis by specialist counsel.
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