Enviro Tech v. Safe Foods Corp: Antimicrobial Patent Claims Voided on Indefiniteness
Enviro Tech Chemical Services sued Safe Foods Corporation in Arkansas Eastern District Court alleging infringement of US10912321B2, covering antimicrobial chemical treatments including Adjust™ and Promoat™. After 1,089 days of litigation, the court invalidated all asserted patent claims on indefiniteness grounds — ruling the terms ‘about’ and ‘antimicrobial amount’ fatally imprecise — delivering a complete defense win.
A food-safety patent destroyed by its own claim language
On July 2, 2021, Enviro Tech Chemical Services, Inc. filed suit against Safe Foods Corporation in the U.S. District Court for the Eastern District of Arkansas, asserting infringement of US10912321B2 — a patent covering antimicrobial chemical treatment formulations. The accused products included Adjust™ and Promoat™, both positioned in the food-safety and antimicrobial treatment market. The case was presided over by Judge Lee P. Rudofsky.
The litigation ended not at trial but at the claim construction stage. On December 15, 2022, the court issued its Claim Construction Order finding two key terms — ‘about’ (with reference to pH) and ‘antimicrobial amount’ — to be indefinite under 35 U.S.C. § 112. Because these terms appeared in all five independent claims (claims 1, 10, 19, 24, and 29) and the majority of dependent claims, the ruling rendered virtually the entire asserted patent invalid. Final judgment was entered for Safe Foods Corporation on June 25, 2024, with costs directed to defendant.
The case ran nearly three years before resolving on a threshold legal question rather than technical merits or commercial settlement. The outcome suggests Enviro Tech’s patent drafting left critical claim terms without sufficient definiteness to survive judicial scrutiny. What remains unknown from the public record is whether Enviro Tech plans to appeal or whether any continuation patents cover the same or related technology — a material question for competitors monitoring this space.
Filing to Judgment on the merits for Defendant in 1089 days
1,089 days — approximately 3 years from filing to final judgment, above the median for patent cases in Arkansas Eastern District
Judgment for defendant: what the indefiniteness ruling means for both parties
Indefiniteness under § 112 voids all independent claims
Under 35 U.S.C. § 112(b), a patent claim is invalid if it fails to inform a skilled artisan with reasonable certainty about its scope. Here, the court found ‘about’ (modifying pH values) and ‘antimicrobial amount’ both indefinite. Because every independent claim contained at least one of these terms, and most dependent claims inherited them, the ruling cascaded to invalidate the vast majority of asserted claims — leaving no surviving basis for Enviro Tech’s infringement action.
§ 112 indefiniteness — complete invalidityEnviro Tech loses all claims; patent unenforceable as asserted
The judgment is entered against Enviro Tech on all legal claims, and costs will be assessed against it. US10912321B2 is effectively unenforceable in its asserted form. Enviro Tech retains the right to appeal to the Federal Circuit, but indefiniteness findings — resolved at claim construction — face a de novo standard of review that can be difficult to overturn without clear drafting error by the lower court. Any prosecution of continuation applications covering the same technology is now under heightened scrutiny.
Patent invalidated — appeal window openSafe Foods wins completely — costs to follow
Safe Foods Corporation secured a full judgment on the merits, meaning the court definitively resolved the underlying legal questions rather than merely dismissing on procedural grounds. This outcome is stronger than a settlement or without-prejudice dismissal: Enviro Tech cannot re-file the same infringement claims against Safe Foods based on the invalidated claims. Safe Foods is also entitled to seek recovery of its litigation costs, which after nearly three years of proceedings may be substantial.
Merits win — costs recoverableIndefiniteness risk in antimicrobial formulation patents now sharper
This ruling signals that approximate claim language — particularly modifier terms like ‘about’ tied to measurable chemical parameters such as pH, and functional terms like ‘antimicrobial amount’ — will be rigorously tested in food-safety and chemical treatment patents. Competitors in the antimicrobial treatment and food-processing sectors should treat this case as a drafting precedent: vague quantitative ranges and undefined functional thresholds are now a material invalidity risk. Patent applicants and prosecutors in this space should consider numerical definitions with clear bounds.
Drafting risk — chemical/food-safety sectorFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Enviro Tech Chemical Services, Inc. | Company | Antimicrobial chemical services company — holder of US10912321B2 (food-safety treatments)Search in Eureka ↗ |
| Defendant | Safe Foods Corporation | Company | Safe Foods Corporation — antimicrobial food-safety solutions provider, accused of infringing US10912321B2Search in Eureka ↗ |
| Plaintiff counsel | Kael K. Bowling | Attorney | Counsel for Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Mark K. Cameron | Attorney | Counsel for Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Marshall S. Ney | Attorney | Counsel for Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Nathan I. North | Attorney | Counsel for Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Robert W. George | Attorney | Counsel for Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Ryan D. Levy | Attorney | Counsel for Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Seth R. Ogden | Attorney | Counsel for Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Friday, Eldredge & Clark, LLP | Law Firm | Representing Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Patterson Intellectual Property Law PC | Law Firm | Representing Enviro Tech Chemical Services, Inc.Search in Eureka ↗ |
| Defendant counsel | Amir H. Alavi | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant counsel | Brian E. Simmons | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant counsel | Frederick Hart Davis | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant counsel | Jess L. Askew , III | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant counsel | Joshua S. Wyde | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant counsel | Justin Y. Chen | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant counsel | Scott W. Clark | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant counsel | Steven T. Jugle | Attorney | Counsel for Safe Foods CorporationSearch in Eureka ↗ |
| Defendant law firm | Ahmad, Zavitsanos & Mensing, PLLC | Law Firm | Representing Safe Foods CorporationSearch in Eureka ↗ |
| Defendant law firm | Alavi & Anaipakos PLLC | Law Firm | Representing Safe Foods CorporationSearch in Eureka ↗ |
| Defendant law firm | Kutak Rock LLP | Law Firm | Representing Safe Foods CorporationSearch in Eureka ↗ |
| Presiding judge | Judge Lee P. Rudofsky | Judge | Arkansas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s June 25, 2024 final judgment enters comprehensively in favor of Safe Foods Corporation on all of Enviro Tech’s legal claims — a merits disposition, not a procedural exit. The verdict flows directly from the December 2022 Claim Construction Order, which found two terms independently sufficient to invalidate all five independent claims. Because indefiniteness under § 112(b) is a question of law reviewed de novo on appeal, the Federal Circuit would evaluate the court’s claim construction without deference, but the breadth of the ruling across multiple terms and all independent claims creates a high bar for reversal.
US10912321B2 — Antimicrobial treatment formulations for food safety
US10912321B2, filed under application number US13/199029, covers antimicrobial chemical formulations used in food-safety treatment contexts — the technology underlying products including Adjust™ and Promoat™. The patent’s independent claims define formulation parameters including pH and dosage expressed using approximate language. That drafting approach, common in chemistry patents where precise numerical bounds may be commercially constraining, proved fatal: the Arkansas Eastern District Court found both ‘about’ (pH) and ‘antimicrobial amount’ indefinite, collapsing all independent claims.
For the food-safety and antimicrobial chemical treatment sector, US10912321B2 represented an attempt to protect a commercially meaningful formulation space. Its invalidation on indefiniteness — rather than on prior art or non-infringement — suggests the underlying technology may still be patentable with more precise claim drafting. Competitors and licensees should assess whether Enviro Tech holds continuation applications with corrected language, and whether the core antimicrobial technology remains protectable under stricter claim construction standards.
Should you run an FTO against US10912321B2?
Any company developing or commercialising antimicrobial treatment formulations for food-safety applications — including processing aids, sanitisers, or pH-adjusted chemical treatments — should understand the status of US10912321B2. While the asserted claims have been invalidated in this case, the patent remains in the USPTO register unless formally cancelled. Product teams commercialising Adjust™ or Promoat™ analogues, or formulations in the same antimicrobial pH-range space, should verify claim status and monitor for related continuation filings.
PatSnap Eureka’s FTO Search Agent can map US10912321B2’s claim family, identify any surviving or continuation claims in prosecution, and surface related prior art that may affect the validity of successor filings. For R&D teams building next-generation antimicrobial formulations, Eureka can benchmark your formulation parameters against the invalidated claim language — helping you design around residual IP risk while the patent holder’s prosecution strategy remains active.
Run a freedom-to-operate analysis on US10912321B2 to assess your product’s exposure
Run FTO in Eureka →Similar antimicrobial formulation patent infringement cases
Browse related patent infringement disputes involving antimicrobial and food-safety chemical formulations in U.S. district courts, including § 112 indefiniteness defences.
What this case signals for the antimicrobial and food-safety IP landscape
A complete defendant win on indefiniteness grounds reshapes enforcement risk for the entire antimicrobial chemical treatment sector.
Approximate pH language is a live invalidity risk in chemistry patents
The court’s finding that ‘about’ (modifying a pH value) is indefinite is directly applicable to any antimicrobial, formulation, or chemical patent that uses approximate quantitative modifiers without defining their bounds. Patent holders in adjacent sectors — food processing, sanitisation, water treatment — should audit existing claims for similar language before asserting them.
Functional claim terms without numerical anchors invite § 112 attack
The invalidation of ‘antimicrobial amount’ as indefinite illustrates that result-oriented claim language lacking a measurable threshold is vulnerable at claim construction. Defendants in formulation-patent disputes should prioritise § 112 challenges early — before expensive discovery — as this case demonstrates they can end litigation at the construction stage.
Enviro v Safe — key questions answered
The court entered final judgment in favor of Safe Foods Corporation on all of Enviro Tech’s legal claims. The ruling followed a December 2022 Claim Construction Order that found the terms ‘about’ (modifying pH) and ‘antimicrobial amount’ in US10912321B2 to be indefinite under 35 U.S.C. § 112(b), invalidating all five independent claims and the majority of dependent claims.
Judge Rudofsky found that the term ‘about’ as applied to pH values, and the term ‘antimicrobial amount,’ each failed to inform a person of ordinary skill in the art with reasonable certainty about the scope of the claims. Because both terms appeared across all independent claims (1, 10, 19, 24, and 29), the indefiniteness finding invalidated virtually the entire asserted patent.
The infringement contentions centred on Enviro Tech’s Adjust™ and Promoat™ products — antimicrobial chemical treatment formulations used in food-safety contexts. The case resolved on claim invalidity before any technical infringement analysis was adjudicated on the merits.
Yes. The court’s June 25, 2024 order is described as a final appealable order disposing of the entire case, making it ripe for appeal to the U.S. Court of Appeals for the Federal Circuit. Indefiniteness determinations are reviewed de novo by the Federal Circuit, meaning no deference is given to the district court’s findings — though the breadth of the ruling across multiple terms and all independent claims represents a significant hurdle for reversal.
The ruling is a cautionary signal for antimicrobial and chemical formulation patent holders who rely on approximate quantitative language — such as ‘about’ modifying pH ranges — or functional dosage terms like ‘antimicrobial amount’ without numerical definition. Such terms are now demonstrably vulnerable to § 112(b) indefiniteness challenges at the claim construction stage, which can end litigation before trial and result in complete invalidity of the asserted patent.
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