iMod Systems LLC v. TGA Industries Limited — Dismissed Without Prejudice After 104 Days
iMod Systems LLC filed a patent infringement action against TGA Industries Limited in the Eastern District of Texas, asserting US7249882B2 covering a method for determining integration initial values in PID controllers. The case was voluntarily dismissed without prejudice after just 104 days, before the defendant had filed any answer or summary judgment motion.
Early voluntary exit in E.D. Tex. PID controller infringement suit
On August 22, 2025, iMod Systems LLC filed a patent infringement action against TGA Industries Limited in the United States District Court for the Eastern District of Texas (Case No. 2:25-cv-00847), before Judge Rodney Gilstrap. The suit asserted US7249882B2, a patent directed to a method for determining the integration initial value of a PID (proportional-integral-derivative) controller — a foundational control-systems technology with broad industrial applications. iMod was represented by Isaac Phillip Rabicoff of Rabicoff Law LLC, a firm known for patent assertion work.
The case closed on December 4, 2025, just 104 days after filing, via a Notice of Voluntary Dismissal Without Prejudice filed by iMod Systems LLC under Federal Rule of Civil Procedure 41(a)(1)(A)(i). Because TGA Industries had not yet answered the complaint or moved for summary judgment, iMod was entitled to dismiss as of right without court approval. Judge Gilstrap accepted and acknowledged the dismissal, denied all pending relief requests as moot, and directed the clerk to close the case. Each party was ordered to bear its own costs, expenses, and attorneys’ fees.
The 104-day lifespan and pre-answer timing suggest the parties may have reached an early commercial resolution or that iMod reassessed its litigation position after filing — though the public record is silent on any settlement terms or licensing agreement. A dismissal without prejudice leaves iMod free to refile the same claims against TGA Industries or other defendants. The absence of any fee-shifting award is consistent with Rule 41(a)(1) dismissals, where courts typically have no grounds to award fees absent exceptional circumstances.
Filing to Voluntary dismissal in 104 days
104 days — resolved before answer or summary judgment, faster than most E.D. Tex. patent cases
Voluntarily dismissed without prejudice: what the order means for both parties
Rule 41(a)(1)(A)(i): dismissal as of right, no court approval needed
Under Federal Rule of Civil Procedure 41(a)(1)(A)(i), a plaintiff may voluntarily dismiss a case without a court order at any time before the defendant serves an answer or a motion for summary judgment. Because TGA Industries had not yet responded, iMod Systems exercised this right unilaterally. The court’s order is an acceptance and acknowledgment — not a grant of permission. The dismissal is without prejudice, meaning no adjudication on the merits occurred.
Dismissed without court rulingWithout prejudice vs. with prejudice: a critical legal difference
A dismissal without prejudice does not bar refiling — iMod Systems retains the right to bring the same US7249882B2 claims against TGA Industries or any other party in the future, subject to applicable statutes of limitations. A dismissal with prejudice, by contrast, would permanently extinguish those claims. The public record here confirms the dismissal is without prejudice. Whether any private settlement or licensing agreement accompanied the dismissal is not disclosed in the court record.
Refiling rights preservediMod Systems preserves all enforcement options on US7249882B2
By dismissing without prejudice, iMod Systems LLC exits this specific proceeding without conceding invalidity, non-infringement, or any other defense. The patent remains in force. iMod may pursue TGA Industries again, target other companies in the PID controller or industrial automation space, or leverage the filing as a signal in licensing negotiations. The early-stage dismissal avoids the reputational and financial cost of a contested merits ruling.
Patent enforcement intactTGA Industries exits without admissions — but uncertainty remains
TGA Industries Limited obtains a practical reprieve: the case is closed and no adverse ruling was entered. However, because the dismissal is without prejudice, TGA cannot treat this as a final resolution. If iMod Systems or another assignee of US7249882B2 refiles, TGA would face the same infringement allegations. Companies in this position often use the interim period to conduct freedom-to-operate analysis, design-around assessments, or seek inter partes review of the asserted patent.
No final resolution on meritsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | iMod Systems LLC | Company | Patent assertion entity — holder of US7249882B2, PID controller method patentSearch in Eureka ↗ |
| Defendant | TGA Industries Limited | Company | TGA Industries Limited — defendant in PID controller patent infringement actionSearch in Eureka ↗ |
| Plaintiff counsel | Isaac Phillip Rabicoff | Attorney | Counsel for iMod Systems LLCSearch in Eureka ↗ |
| Plaintiff law firm | Rabicoff Law LLC | Law Firm | Representing iMod Systems LLCSearch in Eureka ↗ |
| Defendant counsel | Melissa Richards Smith | Attorney | Counsel for TGA Industries LimitedSearch in Eureka ↗ |
| Defendant law firm | Gillam & Smith LLP | Law Firm | Representing TGA Industries LimitedSearch in Eureka ↗ |
| Presiding judge | Judge Rodney Gilstrap | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order accepts and acknowledges iMod Systems’ Rule 41(a)(1)(A)(i) notice rather than adjudicating any disputed issue. The phrasing ‘dismissed without prejudice’ confirms no merits determination was made — neither infringement nor validity was ruled upon. The cost-bearing clause (‘each party to bear its own costs’) is standard for pre-answer voluntary dismissals and does not signal any underlying commercial terms. All pending relief denied as moot reflects that no injunctive or declaratory motions remained live.
US7249882B2 — PID controller integration initial value determination method
US7249882B2 (application no. US11/249415) protects a method for determining the integration initial value of a PID (proportional-integral-derivative) controller. PID controllers are the dominant feedback-control algorithm in industrial automation, process control, HVAC systems, motor drives, and robotics. The patent addresses the initialisation step — specifically how the integral term’s starting value is set — which directly affects controller stability, overshoot behaviour, and bump-free transfer between operating modes. The application date context suggests the patent predates widespread adoption of advanced embedded control libraries.
From a competitive standpoint, a patent on PID initialisation methodology carries significant reach: virtually every industrial controller, programmable logic controller (PLC), servo amplifier, or distributed control system (DCS) implements some form of PID with an initialisation routine. If the claim scope is broad, the patent could potentially cover products from major automation vendors. The Eastern District of Texas filing against TGA Industries — a single defendant — may represent an early probe in a broader enforcement programme. Companies developing or integrating PID-based control software should assess whether their initialisation architectures fall within the claimed method steps.
Should your control system product be cleared against US7249882B2?
Any organisation developing, manufacturing, or integrating products with PID control functionality — including industrial PLCs, servo drives, HVAC controllers, process control systems, or robotics platforms — should consider whether their initialisation routines implicate US7249882B2. The patent’s focus on how the integration initial value is determined means that standard anti-windup or bumpless transfer implementations could be at risk depending on claim construction. The Eastern District of Texas filing signals active enforcement intent.
PatSnap Eureka’s FTO Search Agent enables R&D and IP teams to map product-specific PID controller initialisation workflows against the claim elements of US7249882B2 and its family members in minutes. Eureka surfaces related prosecution history, identifies prior art that could support an IPR petition, and flags continuation applications that may extend enforcement risk. Run a targeted FTO before your next product launch or supplier qualification to avoid costly reactive litigation.
Run a freedom-to-operate analysis on US7249882B2 to assess your product’s exposure
Run FTO in Eureka →Similar PID controller and industrial automation patent cases in E.D. Tex.
Explore related patent infringement cases involving industrial control systems and PID controller technology filed in the Eastern District of Texas before Judge Gilstrap.
What this case signals for the industrial control systems IP landscape
Pre-answer dismissals in E.D. Tex. rarely close without strategic context — either commercial resolution or a recalibrated enforcement roadmap.
PID controller patents are attracting assertion activity in E.D. Tex.
The filing of US7249882B2 in the Eastern District of Texas — a preferred venue for patent assertion — suggests iMod Systems is pursuing a structured enforcement campaign. Control-systems IP, often overlooked in FTO clearances, can create unexpected exposure for industrial automation, HVAC, and motor control product developers. Companies shipping products with embedded PID functionality should review their clearance position.
Early dismissal without prejudice is a common assertion-campaign tactic
A pre-answer voluntary dismissal may reflect a private resolution, a decision to refile with a stronger claim chart, or a pivot to a different defendant roster. Patent holders using this approach preserve optionality at minimal cost. Defendants and their counsel should monitor for refiling activity and consider whether a proactive IPR or ex parte reexamination of US7249882B2 would neutralise future risk more efficiently than reactive litigation.
iMod v TGA — key questions answered
The case was dismissed without prejudice. iMod Systems LLC filed a Notice of Voluntary Dismissal under FRCP 41(a)(1)(A)(i), and Judge Gilstrap accepted and acknowledged that all claims were dismissed without prejudice. This means iMod retains the right to refile the same claims against TGA Industries or other parties.
iMod Systems LLC asserted US7249882B2, titled ‘Method for determining integration initial value of PID controller’ (application no. US11/249415). The patent relates to a method for setting the integration initial value in a PID (proportional-integral-derivative) controller, a core component of industrial automation and process control systems.
The case was voluntarily dismissed 104 days after filing, before TGA Industries had filed an answer or summary judgment motion. The public record does not disclose the reason. Possible explanations include a private settlement or licensing agreement, a reassessment of the infringement position, or a strategic decision to refile against different defendants. The dismissal without prejudice preserves all of iMod’s enforcement options.
iMod Systems LLC was represented by Isaac Phillip Rabicoff of Rabicoff Law LLC. TGA Industries Limited was represented by Melissa Richards Smith of Gillam & Smith LLP, a prominent East Texas patent litigation firm. The case was assigned to Judge Rodney Gilstrap of the Eastern District of Texas.
No. A dismissal without prejudice under FRCP 41(a)(1)(A)(i) does not bar refiling. iMod Systems may refile the same US7249882B2 claims against TGA Industries at any time within the applicable statute of limitations. However, if iMod were to refile and voluntarily dismiss a second time, a court could treat the second dismissal as an adjudication on the merits under the ‘two-dismissal rule’ of FRCP 41(a)(1)(B).
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