1:26-cv-01012
RB Distribution Inc v. Federal Mogul Motorparts LLC
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: RB Distribution, Inc. and Dorman Products, Inc. (Pennsylvania)
- Defendant: Federal-Mogul Motorparts LLC, Advanced Suspension Technology LLC, and DFMMP LLC (Delaware)
- Plaintiff's Counsel: Potter Anderson & Corroon LLP
- Case Identification: 1:26-cv-01012, D. Del., 08/10/2026
- Venue Allegations: Venue is alleged to be proper in the District of Delaware because each Defendant is a Delaware entity and therefore resides in the district.
- Core Dispute: Plaintiff alleges that Defendant's aftermarket aluminum engine oil filter housings infringe four patents related to the design and manufacture of a single-piece, cast metallic oil filter adaptor.
- Technical Context: The technology concerns aftermarket automotive components, specifically durable cast aluminum replacements for original equipment manufacturer (OEM) plastic oil filter housings, which are described as prone to failure.
- Key Procedural History: The complaint notes that all four asserted patents have been the subject of ex parte re-examination requests by a non-party. For U.S. Patents 11,635,005, 11,639,674, and 11,639,675, the USPTO reportedly instituted a first re-examination and confirmed or amended the claims, and a second re-examination has been requested. For U.S. Patent 12,234,755, a re-examination has been requested. The complaint also details a series of pre-suit communications in which Plaintiff allegedly provided Defendant with notice of the patents and infringement contentions.
Case Timeline
| Date | Event |
|---|---|
| 2020-08-21 | Priority Date for all Asserted Patents |
| 2021-07-12 | Plaintiff allegedly begins "patent pending" marking on its products |
| 2022-02-24 | Publication of patent application related to the '005 Patent |
| 2023-04-25 | U.S. Patent No. 11,635,005 ('005 Patent) Issues |
| 2023-05-02 | U.S. Patent No. 11,639,674 ('674 Patent) Issues |
| 2023-05-02 | U.S. Patent No. 11,639,675 ('675 Patent) Issues |
| 2023-06-27 | Certificate of Correction issued for '005, '674, and '675 Patents |
| 2023-07-28 | First ex parte re-examination requested for '005, '674, and '675 Patents |
| 2025-02-25 | U.S. Patent No. 12,234,755 ('755 Patent) Issues |
| 2025-07-29 | Certificate of Correction issued for '755 Patent |
| 2025-10-17 | Second ex parte re-examination requested for '005, '674, '675; first for '755 |
| 2026-03-18 | Plaintiff provides Defendant with alleged actual notice of Asserted Patents |
| 2026-06-22 | Approximate date Plaintiff purchased exemplar of Infringing Product |
| 2026-07-17 | Plaintiff provides Defendant with alleged claim charts |
| 2026-08-10 | Complaint Filed |
II. Technology and Patent(s)-in-Suit Analysis
U.S. Patent No. 11,635,005 - "Oil Filter Assembly"
The Invention Explained
- Problem Addressed: The patent's background describes problems with prior art oil filter assemblies made from plastic Compl. ¶32 '005 Patent, col. 1:25-38 These assemblies often require metallic inserts for threading components and plugs to seal openings left by the molding process, creating multiple potential failure points for leaks or stress cracks due to heat, pressure, and overtightening '005 Patent, col. 1:39-57
- The Patented Solution: The invention is a single-piece, cast metallic (preferably aluminum) adaptor that integrates the oil filter housing and base '005 Patent, col. 1:61-64 This "unitary" construction eliminates the need for failure-prone inserts and plugs by allowing components, such as sensors, to be threaded directly into the robust metal body '005 Patent, col. 2:61-col. 3:7 The design also provides an enclosed, linear oil flow path contained entirely within the casting, which improves durability against burst pressure and degradation '005 Patent, col. 3:16-27 '005 Patent, Fig. 5
- Technical Importance: This approach provides a direct, more durable replacement for failure-prone OEM plastic components, aiming to improve reliability and simplify repairs in the automotive aftermarket industry '005 Patent, col. 3:28-32
Key Claims at a Glance
- The complaint asserts independent claim 1 Compl. ¶52
- The essential elements of claim 1 include:
- An adaptor for connecting an oil filter and an oil cooler to an engine.
- A "single metallic casting" that has an elongated body with specific upper and lower mating surfaces and an integrated oil filter housing.
- An "oil lubrication flow path" that is "wholly within the elongated body."
- "At least one threaded aperture" formed in the single metallic casting for "direct threaded engagement" with an additional component.
- The complaint does not explicitly reserve the right to assert dependent claims for the '005 Patent.
U.S. Patent No. 11,639,674 - "Oil Filter Assembly"
The Invention Explained
- Problem Addressed: As a continuation of the application that led to the '005 Patent, this patent addresses the same technical problems of failure in plastic oil filter assemblies due to their hybrid construction and the need for inserts and plugs Compl. ¶23 '674 Patent, col. 1:39-59
- The Patented Solution: The solution is again a "unitary metallic casting" that forms an integrated oil filter adaptor assembly '674 Patent, col. 2:64-65 By creating a single, robust metallic structure, the design allows for direct threading of components and contains the oil flow paths entirely within the casting, which avoids the weaknesses of prior art plastic-and-metal designs '674 Patent, abstract '674 Patent, col. 3:20-27 '674 Patent, Fig. 4
- Technical Importance: The invention offers a more reliable and durable alternative for a critical engine component, targeting the automotive aftermarket with a direct-replacement upgrade part '674 Patent, col. 3:30-34
Key Claims at a Glance
- The complaint asserts independent claim 1 Compl. ¶68
- The essential elements of claim 1 include:
- An engine oil adaptor assembly for mounting in an engine valley.
- A "unitary metallic casting" defining an "integrated structure."
- An elongated casted body portion with specific surfaces for mating with an engine and an oil cooler.
- An "internal lubrication flow path" connecting the engine's lubrication network and an oil filter housing.
- A "plurality of apertures" that are "directly threaded in the elongated casted body" for mating with threaded components.
- The complaint does not explicitly reserve the right to assert dependent claims for the '674 Patent.
U.S. Patent No. 11,639,675 - "Oil Filter Assembly"
Technology Synopsis
This patent, which shares a common specification with the '674 Patent, also discloses a one-piece cast metallic adaptor for an engine lubrication system Compl. ¶26 The invention aims to solve the durability issues of prior art plastic assemblies by creating a robust, unitary structure that allows for the direct threading of components without the need for failure-prone inserts or plugs '675 Patent, abstract '675 Patent, col. 1:28-52
Asserted Claims
The complaint asserts independent claim 12 Compl. ¶84
Accused Features
The accused products are alleged to infringe by being a "one-piece metallic casting" with an elongated body, an integrally cast oil filter housing, an internal fluid passage, and a "plurality of apertures that are threaded directly in the casting" Compl. ¶¶87-89
U.S. Patent No. 12,234,755 - "Method and Process for Manufacturing a Unitary Oil Filter Adaptor"
Technology Synopsis
This patent claims the method of manufacturing the unitary oil filter adaptor described in the related patents Compl. ¶29 The process involves casting an elongated unitary metallic body with integrated features like a filter housing, mating surfaces, and internal lubrication flow paths, and then threading apertures directly into the casting for mating with other components '755 Patent, abstract '755 Patent, col. 4:1-24
Asserted Claims
The complaint asserts independent claim 12 Compl. ¶99
Accused Features
The accused products are alleged to infringe by being a "single-cast metallic body" comprising a filter housing, specific mating surfaces, a lubrication flow path, and an "internally-threaded casted aperture" Compl. ¶¶102-107
III. The Accused Instrumentality
Product Identification
The accused products are aftermarket engine oil filter housings sold under the names "Fel-Pro OFHA1001" and "Fel-Pro OFHA1001 Engine Oil Filter Housing" Compl. ¶39 The complaint identifies one such product via Amazon Standard Identification Number (ASIN) B0H46Y6FT3 Compl. ¶39
Functionality and Market Context
The accused products are described as replacement parts made from "durable aluminum construction" designed to replace OEM plastic oil filter housings on a variety of vehicles Compl. Illustration 5 They are marketed as a "time-saving solution" and a complete, pre-assembled unit that includes an oil filter housing, connections for an oil cooler, and pre-installed sensors Compl. Illustration 5 The complaint alleges these products are sold through major online retailers like Amazon and RockAuto.com Compl. ¶40 A side-by-side photograph in the complaint purports to show that the accused product is a "substantially identical replication" of the Plaintiff's patented product Compl. ¶42 Compl. Illustration 6
IV. Analysis of Infringement Allegations
11,635,005 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| An adaptor for connecting an oil filter and an oil cooler to an engine | The accused products are described as an "Engine Oil Filter Housing" providing a connection for an engine's oil filter and oil cooler (Compl. ¶54). | ¶54 | col. 1:17-22 |
| a single metallic casting having | The accused products are alleged to have a "unitary body manufactured from casted aluminum" (Compl. ¶55). | ¶55 | col. 2:67-col. 3:1 |
| an elongated body with a lower surface configured to mate with an oil lubrication network in an engine, an oil filter housing is defined at a first end of the elongated body, and an upper surface that is configured to mate with an oil cooler | The accused products allegedly have an elongated body with a lower surface that mates with an engine's lubrication network, an upper surface that mates with an oil cooler, and an oil filter housing at one end (Compl. ¶56). | ¶56 | col. 2:63-67 |
| wherein the elongated body includes an oil lubrication flow path that is wholly within the elongated body and extends between an oil lubrication network in an engine, and the oil filter housing | The elongated body of the accused products allegedly contains an internal path extending between the engine's oil lubrication network and the oil filter housing (Compl. ¶57). | ¶57 | col. 3:16-25 |
| and at least one threaded aperture is formed in the single metallic casting for receiving at least one additional component in a direct threaded engagement with the single metallic casting | The accused products allegedly have threaded apertures cast as part of the unitary aluminum body to receive threaded components (Compl. ¶58). | ¶58 | col. 3:4-7 |
11,639,674 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| An engine oil adaptor assembly for mounting in an engine valley, the adaptor comprising: | The accused products are described as oil filter housing adaptors that connect into the lubrication system in the "valley" of an internal combustion engine (Compl. ¶70). | ¶70 | col. 1:21-24 |
| a unitary metallic casting that defines an integrated structure having: | The accused products are alleged to be "singular, unitary bodies composed of casted aluminum that define integrated structures" (Compl. ¶71). | ¶71 | col. 2:64-65 |
| an elongated casted body portion with a lower surface configured to mate with a predetermined existing engine | The accused products allegedly have an elongated casted body with a lower surface that mates with an internal combustion engine (Compl. ¶72). | ¶72 | col. 3:1-2 |
| an internal lubrication flow path formed within the elongated casted body that connects to a lubrication network within a valley in the predetermined existing engine and an oil filter housing defined at a first end of the elongated casted body | The accused products allegedly have an internal structure for oil flow that connects to the engine's lubrication network and includes an oil filter housing at one end (Compl. ¶73). | ¶73 | col. 3:20-25 |
| an upper surface of the elongated body is configured to mate with an oil cooler | The accused products' elongated body portion allegedly has an upper surface that mates with an oil cooler (Compl. ¶74). | ¶74 | col. 3:36-39 |
| wherein the elongated casted body includes a plurality of apertures that are directly threaded in the elongated casted body for mating with a respective threaded component | The accused products allegedly have "threaded apertures casted as a part of the unitary aluminum body that receive respective threaded components" (Compl. ¶75). | ¶75 | col. 3:55-58 |
Identified Points of Contention
- Factual Identity vs. Technical Distinction: The complaint's core assertion is that the accused product is a "substantially identical replication" of Plaintiff's patented product, supported by a side-by-side photograph Compl. ¶42 Compl. Illustration 6 A central point of contention will be whether there are any subtle manufacturing or structural differences in the accused product that could allow it to evade the literal scope of the claims.
- Impact of Re-examination: The procedural history involving ex parte re-examinations is a significant factor (Compl. ¶¶21; Compl. ¶24; Compl. ¶27; Compl. ¶30). Plaintiff may argue that the patents' survival of a first re-examination, where claims were confirmed or amended, strengthens their presumption of validity. Conversely, Defendant may focus on the fact that the USPTO found a Substantial New Question of Patentability to grant a second re-examination request, suggesting unresolved validity issues.
- Claim Scope Variation: The asserted claims across the patents, while similar, have slightly different limitations (e.g., '005 Patent claim 1 requires "at least one" threaded aperture, while '674 Patent claim 1 requires a "plurality"). These variations could create distinct infringement arguments and potential points of dispute for each patent.
V. Key Claim Terms for Construction
The Term: "single metallic casting" / "unitary metallic casting"
Context and Importance: This term is the technological centerpiece of the asserted patents, distinguishing the invention from the multi-part plastic and metal assemblies described as prior art '005 Patent, col. 1:39-57 The infringement case hinges on the allegation that the accused product is made as one integrated, casted metal piece. Practitioners may focus on this term because any evidence that the accused product involves post-casting assembly of structural components could form the basis of a non-infringement defense.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The specification does not provide significant language to broaden the term beyond its plain meaning. The focus is on the material being a "casted metallic material, preferably aluminum" ('005 Patent, col. 2:67-col. 3:1), which could suggest the specific type of metal is not limiting, but the "single" or "unitary" nature appears consistently defined.
- Evidence for a Narrower Interpretation: The specification repeatedly emphasizes the goal of "eliminating the assembly of multiple molded parts" and avoiding separate inserts and plugs ('005 Patent, col. 1:63-64; '005 Patent, col. 2:1-2). Language stating the "elongated body 112, base 120 and the filter housing 130 are casted together" supports a narrow interpretation where all key structural features are formed in a single casting operation ('005 Patent, col. 3:1-3).
The Term: "wholly within the elongated body"
Context and Importance: This limitation, applied to the oil lubrication flow path, is critical for distinguishing from prior art that required sealing covers or plugs to complete a fluid channel after a molding core was removed ('005 Patent, Fig. 3A; '005 Patent, col. 1:50-57). The infringement allegation depends on the accused product's flow path being entirely self-contained within the casting.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: A party might argue the term simply means the flow path does not exit the external perimeter of the body, potentially allowing for internal baffles or other non-structural components to be added post-casting.
- Evidence for a Narrower Interpretation: The patent states, "The flow path 150 is entirely within the unitary casting so there is no need for adding a closure to the flow path" ('005 Patent, col. 3:25-27). This language strongly supports an interpretation that the channel is defined exclusively by the walls of the single casting, without any separate pieces used to form or seal it.
VI. Other Allegations
Indirect Infringement
The complaint alleges induced infringement, stating that Defendants knowingly encourage infringement through their marketing, websites, and packaging (Compl. ¶¶59-60; Compl. ¶¶76-77). Specific allegations include providing "Installation Tips" and links to "where to buy" the products, which allegedly instruct and enable end-users to install and use the products in an infringing manner (Compl. ¶59; Compl. ¶76).
Willful Infringement
Willfulness is alleged based on both pre-suit and post-suit knowledge (Compl. ¶¶62, 79, 93, 111). The complaint asserts Defendants had constructive notice from Plaintiff's virtual patent marking (Compl. ¶34) and actual notice from correspondence beginning March 18, 2026 (Compl. ¶44). The allegations of "knowing copying" based on the product's similarity and Defendants' continued sales after receiving notice and claim charts are cited as evidence of intentional and malicious conduct (Compl. ¶43; Compl. ¶47; Compl. ¶49).
VII. Analyst's Conclusion: Key Questions for the Case
- A central issue will be one of factual identity and technical nuance: Does the accused Fel-Pro product, alleged to be a "substantially identical replication," contain any minor manufacturing or design distinctions from the asserted claims? The case may turn on whether any such differences are sufficient to place the accused product outside the literal scope of terms like "single metallic casting" and "wholly within," or whether the doctrine of equivalents will become a focal point.
- A key procedural and legal question will be the evidentiary weight of the re-examination history. The court will have to balance the strengthening effect of the patents surviving an initial re-examination against the cloud cast by the USPTO's decision to grant a second re-examination based on a Substantial New Question of Patentability, an issue both parties will likely seek to leverage.
- The case will also likely involve a critical claim construction dispute over the scope of the term "unitary metallic casting." The outcome may depend on whether this term is construed to mean a monolithic part with absolutely no post-casting structural additions, or if it can encompass a product with minor, non-essential components added after the primary casting process.