Columbia Insurance & MiTek v. Simpson Strong-Tie: Dismissed With Prejudice After 930 Days
Columbia Insurance Company and MiTek Inc. brought a patent infringement action in the Northern District of California against Simpson Strong-Tie over fire separation wall hanger technology covered by US11021867 and US11649626. All claims and counterclaims were stipulatively dismissed with prejudice — and no fees or costs were awarded to either side — after nearly two and a half years of litigation.
Structural connector rivals settle fire-wall hanger dispute on neutral terms
Filed on 17 May 2023 in the U.S. District Court for the Northern District of California, this infringement action pitted Columbia Insurance Company and MiTek Inc. against Simpson Strong-Tie Co., Inc. — two of the construction fastener industry’s most prominent competitors. The plaintiffs asserted two utility patents, US11021867B2 and US11649626B2, both directed at hanger technology designed for fire separation walls, a safety-critical application in multi-unit residential and commercial construction.
The case closed on 2 December 2025 via a stipulated dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(ii) — a mechanism requiring agreement of all parties, suggesting neither side was forced to capitulate. Critically, all claims and counterclaims were dismissed with prejudice, meaning plaintiffs are permanently barred from re-filing the same infringement claims against Simpson Strong-Tie on these patents. The absence of any fee or cost award indicates a clean, mutual exit rather than a conceded defeat by either party.
At 930 days, the case ran longer than typical N.D. Cal. pre-trial resolutions, suggesting substantive litigation activity — likely including claim construction briefing and potentially expert discovery — before the parties reached terms. The symmetric no-fee provision is consistent with a negotiated settlement or cross-licensing arrangement, though the public record does not disclose any commercial terms. What drove the resolution, including whether a license or design-around agreement underlies the stipulation, remains confidential.
Filing to Dismissed with Prejudice in 930 days
930 days — above the median for N.D. Cal. patent cases resolved short of trial
Dismissed with prejudice: what the stipulated exit means for both parties
Rule 41(a)(1)(A)(ii) stipulated dismissal — all parties consented
A Rule 41(a)(1)(A)(ii) dismissal requires a signed stipulation from every party, distinguishing it from a unilateral plaintiff withdrawal. The court need not approve it. Here, both sides — including Simpson Strong-Tie on its counterclaims — agreed to exit. This bilateral consent, combined with the ‘with prejudice’ designation, signals a negotiated resolution rather than a one-sided capitulation.
Bilateral stipulated exitWith prejudice: these specific claims cannot be re-filed
Dismissal with prejudice operates as an adjudication on the merits under res judicata principles. Columbia Insurance and MiTek are permanently barred from bringing the same infringement claims against Simpson Strong-Tie based on US11021867 and US11649626. This is materially different from a without-prejudice dismissal, which would preserve the right to refile. The counterclaims — likely invalidity or non-infringement defences — were likewise extinguished with prejudice.
Permanent bar on re-filingPatents survive — but enforcement against this defendant is closed
US11021867 and US11649626 remain in force and can be asserted against other parties. The dismissal with prejudice does not invalidate the patents or create file-wrapper estoppel beyond this dispute. However, any claim construction positions taken during litigation — if disclosed — could inform future enforcement proceedings. The no-fee outcome suggests MiTek and Columbia did not extract a public win, but may have secured private commercial terms.
Patents intact, defendant releasedNo-fee clause signals a balanced exit — likely underpinned by private terms
In contested patent cases, fee awards under 35 U.S.C. § 285 typically follow only in ‘exceptional’ cases. The explicit contractual exclusion of fees here, beyond the statutory default, suggests the parties wanted a clean, symmetric record. This is consistent with a cross-licence, design-around agreement, or market-segmentation deal. Competitors and suppliers in the structural connector space should monitor whether Simpson Strong-Tie subsequently introduces a redesigned fire separation wall hanger product.
Likely private commercial resolutionFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Columbia Insurance Company | Company | Construction fastener IP rights holder — asserting US11021867B2 and US11649626B2Search in Eureka ↗ |
| Co-Plaintiff | Mitek, Inc. | Company | Search in Eureka ↗ |
| Defendant | Simpson Strong-Tie Co., Inc. | Company | Simpson Strong-Tie Co., Inc. — leading structural connector and fastener manufacturerSearch in Eureka ↗ |
| Plaintiff counsel | B. Scott Eidson | Attorney | Counsel for Columbia Insurance CompanySearch in Eureka ↗ |
| Plaintiff counsel | Duane H. Mathiowetz | Attorney | Counsel for Columbia Insurance CompanySearch in Eureka ↗ |
| Plaintiff counsel | John Robert Schroeder | Attorney | Counsel for Columbia Insurance CompanySearch in Eureka ↗ |
| Plaintiff counsel | Judith Samilda Araujo | Attorney | Counsel for Columbia Insurance CompanySearch in Eureka ↗ |
| Plaintiff counsel | Julie C. Scheipeter | Attorney | Counsel for Columbia Insurance CompanySearch in Eureka ↗ |
| Plaintiff counsel | Zachary T. Buchheit | Attorney | Counsel for Columbia Insurance CompanySearch in Eureka ↗ |
| Plaintiff law firm | Practus LLP | Law Firm | Representing Columbia Insurance CompanySearch in Eureka ↗ |
| Plaintiff law firm | Stinson LLP | Law Firm | Representing Columbia Insurance CompanySearch in Eureka ↗ |
| Defendant counsel | Daniel M. Poniatowski | Attorney | Counsel for Simpson Strong-Tie Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Erick Charles Howard | Attorney | Counsel for Simpson Strong-Tie Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Joseph Vincent Mauch | Attorney | Counsel for Simpson Strong-Tie Co., Inc.Search in Eureka ↗ |
| Defendant counsel | Lindsay Anne van Keulen | Attorney | Counsel for Simpson Strong-Tie Co., Inc.Search in Eureka ↗ |
| Defendant law firm | DMP Law Corporation | Law Firm | Representing Simpson Strong-Tie Co., Inc.Search in Eureka ↗ |
| Defendant law firm | Shartsis Friese LLP | Law Firm | Representing Simpson Strong-Tie Co., Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | California Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The stipulation explicitly invokes Rule 41(a)(1)(A)(ii) and N.D. Cal. Local Rule 7-12, signalling a fully consensual, court-approved procedural exit. The phrase ‘with prejudice and without an award of fees or costs’ is deliberate drafting: ‘with prejudice’ extinguishes all listed claims and counterclaims permanently, while the fee waiver departs from the default position and suggests the parties negotiated parity. Neither party obtained a public merits adjudication, leaving the patents’ validity and infringement questions legally unresolved on the public record.
US11021867B2 & US11649626B2 — Fire Separation Wall Hanger Technology
US11021867B2 (App. No. 16/433799) and US11649626B2 (App. No. 17/235349) both cover hanger technology engineered for fire separation wall applications — a safety-critical category in multi-unit residential and commercial construction governed by building codes. These patents reflect innovations in how structural connectors interface with fire-rated wall assemblies, balancing load-bearing performance with fire-resistance compliance. The successive application numbers suggest a continuation or continuation-in-part relationship, broadening protection across a product family.
In the structural connector market — dominated by a small number of large players including MiTek and Simpson Strong-Tie — fire-rated assembly hardware represents a high-value product segment tied to mandatory building code compliance. Patents covering hangers for fire separation walls create meaningful barriers to entry: competitors cannot simply copy geometry without design-around investment. The two-patent portfolio suggests MiTek pursued layered protection, and the 930-day litigation timeline implies Simpson Strong-Tie did not concede infringement or invalidity quickly, indicating genuine technical differentiation in the claim scope.
Should your team run an FTO against US11021867 and US11649626?
Any engineering or product team developing structural hangers, joist hangers, or connectors intended for use in fire-rated or fire separation wall assemblies should treat these two MiTek patents as mandatory FTO checkpoints. The patents cover a specific and commercially active product category; the litigation confirms MiTek is prepared to enforce them. Building code-driven demand for fire-separation hardware means the market is too large to enter without a clear freedom-to-operate position — especially in multi-unit residential and commercial construction segments.
PatSnap Eureka’s FTO Search Agent can map the claim scope of US11021867 and US11649626 against your product designs, identify the closest prior art, and surface related continuation applications that may extend the family’s reach. Eureka also tracks PTAB inter partes review petitions filed against both patents, giving R&D and legal teams real-time visibility into whether third-party invalidity challenges have weakened the claims — critical context before any design decision or market entry.
Run a freedom-to-operate analysis on US11021867B2 to assess your product’s exposure
Run FTO in Eureka →Similar structural connector and fire-rated hardware patent cases
Explore comparable patent infringement actions involving structural connectors and fire-rated building hardware in the Northern District of California and related federal courts.
What this case signals for the structural connector IP landscape
Two assertive patent holders and a dominant industry rival resolved a high-stakes fire-safety hanger dispute on strictly neutral public terms — here is what that means.
Fire separation wall hanger patents are actively enforced IP assets
The willingness of Columbia Insurance and MiTek to sustain 930 days of N.D. Cal. litigation signals that US11021867 and US11649626 are commercially strategic patents, not defensive filings. Any manufacturer or distributor of structural connectors for fire-rated wall assemblies should treat these patents as live enforcement risks and conduct FTO analysis before product launch.
Stipulated dismissals with no fee award rarely mean patent weakness
A mutual, no-fee exit after nearly three years of litigation typically reflects a negotiated commercial resolution rather than either party conceding on the merits. The patents remain in force. Competitors drawing the inference that these claims were too weak to sustain may be misreading the resolution and underestimating future enforcement exposure.
Columbia v Simpson — key questions answered
The case was dismissed with prejudice by joint stipulation on 2 December 2025, after 930 days of litigation. All claims and counterclaims were extinguished with no award of fees or costs to either party. The dismissal was filed pursuant to Rule 41(a)(1)(A)(ii), requiring the consent of all parties.
Plaintiffs asserted US11021867B2 (Application No. 16/433799) and US11649626B2 (Application No. 17/235349). Both patents are directed at hanger technology for fire separation wall applications in construction. The consecutive application numbers suggest these patents form part of a continuation family.
A dismissal with prejudice operates as a final adjudication on the merits under res judicata principles. Columbia Insurance and MiTek are permanently barred from asserting the same infringement claims under US11021867 and US11649626 against Simpson Strong-Tie in any future proceeding. The patents themselves remain valid and enforceable against other defendants.
The stipulation explicitly excluded any award of fees or costs — a provision that goes beyond the statutory default. Under 35 U.S.C. § 285, fee awards require a finding of an ‘exceptional’ case, so the default absence of fees is normal. The explicit contractual waiver here suggests the parties negotiated parity as part of a broader resolution, consistent with a settlement or licensing arrangement, though no commercial terms are publicly disclosed.
The case centres on hangers for fire separation walls — structural connectors used in fire-rated wall assemblies in multi-unit residential and commercial buildings. This is a safety-critical, building-code-regulated product category in which MiTek and Simpson Strong-Tie are direct competitors. Fire separation wall hangers must meet specific load and fire-resistance performance standards, making patented design features commercially significant.
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