When a Former Supplier Launches a Lookalike Industrial Component

A Ningbo manufacturer gives a long-term supplier drawings, tolerances and testing requirements for a proprietary industrial component. The relationship ends. Six months later, the supplier launches a competing component that looks similar, fits the same equipment and appears to use several engineering solutions developed during the collaboration. Management wants to sue for “copying.” China law offers several potentially relevant routes, including patent infringement, trade-secret claims and unfair-competition theories. The Patent Law protects inventions, utility models and designs within the scope of granted rights.^[1] The 2025 Anti-Unfair Competition Law protects trade secrets where information is non-public, commercially valuable and subject to corresponding confidentiality measures; it also provides an evidentiary burden framework for qualifying trade-secret disputes.^[2] The litigation strategy should not begin with the broadest accusation. It should begin by identifying which legal right protects which technical feature and what evidence proves the supplier’s access and use.

The specific problem#

Rights mapping and patent-based technical analysis#

Build a rights map before sending a cease-and-desist letter. The manufacturer can separate the product into legally relevant components. One feature may be covered by an invention patent. A connector geometry may be protected by a utility model. The exterior may be subject to a design patent. Manufacturing tolerances, heat-treatment parameters or test procedures may remain confidential know-how. The rights map needs to identify: patent number and owner, claim or design feature, confidential engineering information, source of the information, supplier access, and contractual restrictions. The company can also mark public information. A drawing published in a patent specification cannot simultaneously be treated as secret merely because it is commercially important. This exercise prevents contradictory pleading. If the strongest patent covers only one technical relationship, the infringement case should focus there. If the supplier copied unpatented process data, the trade-secret theory should define those secret points separately. A clear rights map also improves settlement. The supplier can understand which conduct must stop and which product features may be redesigned lawfully.

Patent infringement requires claim-based technical comparison, not overall resemblance. For invention and utility-model patents, infringement turns on whether the accused technical solution falls within the scope of the patent claims as interpreted under applicable law.^[1] A product can look almost identical and still avoid a claim limitation. Conversely, it can look different but reproduce every claimed technical feature. The litigation team can therefore obtain an accused product lawfully and conduct a claim chart. For each asserted claim: 1. Identify each limitation;

1. Map the accused feature;
2. Record uncertainty;
3. Consider equivalents where legally relevant. The company needs to also review patent validity before filing. The supplier is likely to challenge the patent before the China National Intellectual Property Administration. Prior art, prosecution history and claim amendments should be examined before management assumes the patent is a secure weapon. Luo’s patent-agent background is especially relevant to this technical stage because the dispute depends on the patent text, not only on contract history.

Design-patent strategy should focus on the protected visual design, not functional identity. Industrial components may also have design-patent protection. Management can compare the accused product with the patented design from the perspective required by design-patent law, taking account of the overall visual effect and features relevant to the product. Functional features require careful treatment. A shape dictated entirely by connection or performance may not carry the same design significance as an arbitrary aesthetic feature. The evidence needs to include standardized photographs, product samples and the design-patent file. A supplier may make minor changes after receiving a complaint. The company can preserve versions sold before and after the redesign so that the litigation record does not depend on a later sample. Design protection can be commercially useful where rapid imitation occurs, but it should not be stretched to cover technical concepts that belong in invention or utility-model claims. Trade-secret claims require precise secret points and proof of confidentiality measures. The 2025 Anti-Unfair Competition Law defines trade secrets and protects against improper acquisition, disclosure and use.^[2]

The claimant can identify the secret with enough precision for the court to evaluate it. “Our entire drawing package” or “our manufacturing know-how” may be too vague. A stronger secret schedule might identify: dimensional tolerance not disclosed publicly, supplier qualification parameter, proprietary test sequence, process temperature range, and costed bill-of-material information. For each point, the manufacturer needs evidence that the information was not generally known, had commercial value and was protected through corresponding measures. Relevant measures can include NDAs, supplier clauses, access restrictions, file markings, controlled repositories and return obligations. If the company sent unrestricted drawings to dozens of suppliers without confidentiality language, the litigation team should confront that fact honestly rather than create a secrecy narrative after the relationship ends.

Trade secrets, access and unfair-competition boundaries#

Supplier access and development chronology can establish the bridge between right and use. Even with a valid right, the company needs evidence connecting the former supplier to the disputed information. The file should reconstruct: date drawings were provided, engineers who received them, meetings and technical feedback, supplier modifications, return or destruction requests, date competing development began, and product launch. Version-control records and engineering-change notices can show which technical features originated with the manufacturer and which may have been independently developed by the supplier. A suspiciously short development period may support the factual narrative but does not itself prove infringement. The supplier may also argue that the feature was standard industry practice or already known from prior products. Independent technical experts can help distinguish genuinely proprietary features from ordinary engineering choices. Unfair-competition claims should fill a real legal gap, not replace weak IP rights. The Anti-Unfair Competition Law can address conduct that disturbs market competition or misuses protected commercial information, depending on the facts.^[2] But a company should not invoke “unfair competition” simply because its patent is weak or expired.

The legal team can identify the specific conduct: misuse of trade secrets, misleading product presentation, false association, and other conduct recognized under the statute and case law. Where the dispute is fundamentally about a technical feature placed in the public domain through an expired patent, unfair-competition law should not be used casually to recreate perpetual exclusivity. The strongest cases explain why the defendant’s conduct is independently unlawful rather than merely competitive. This discipline also helps courts understand the relationship among claims. Contract claims can be more efficient than IP claims in some supplier disputes. The manufacturing contract may contain: confidentiality, tooling ownership, no-use restrictions, exclusivity, return/destruction obligations, and liquidated damages. A clear contract breach can sometimes be easier to prove than patent infringement or trade-secret misappropriation. The company should review governing law, dispute forum and limitation periods. Contract and IP claims may proceed together or in different forums depending on the agreements. Counsel can avoid inconsistent factual positions.

If the supplier agreed not to use customer drawings for any third party, the manufacturer may not need to prove every drawing qualifies as a statutory trade secret to establish breach of that contractual promise. However, contractual remedies bind the contracting parties. If a related company or new entity sells the copied product, IP rights may provide broader enforcement.

Contracts, standing and development evidence#

Evidence preservation should precede aggressive communications. Before sending a complaint, preserve: accused product, website and marketplace listings, quotations, customer communications, patent files, supplier contracts, drawing versions, and access logs. A cease-and-desist letter can cause the supplier to change product design, delete marketing or reorganize sales. Where court evidence-preservation measures are appropriate, counsel needs to evaluate them before notifying the defendant. Management can also preserve its own weaknesses, including older public brochures or prior supplier disclosures that may affect secrecy. Selective preservation damages credibility. A litigation-ready file should allow an external expert to reconstruct the product and development history without relying on management memory. Case study: automotive connector supplier. Assume a Ningbo automotive supplier owns a utility-model patent on a connector locking mechanism and provides a subcontractor with detailed mold drawings and tolerance data. After termination, the subcontractor launches a competing connector. Technical review shows that the locking mechanism maps closely to the utility-model claim, while the mold tolerance data never appeared in the patent and was shared under a confidentiality clause. A focused case could therefore combine: patent infringement concerning the locking mechanism, trade-secret misappropriation concerning non-public tolerance data, and contract breach concerning unauthorized use of drawings. The company can avoid claiming that every dimension in the product is secret or patented. If the subcontractor redesigns the locking mechanism, the trade-secret and contract claims may remain relevant even if the new version avoids the patent. That layered but disciplined strategy protects different legal interests without duplicating them. Patent ownership and standing should be verified before the claim is filed. Manufacturing groups often hold IP through one entity while another entity operates the factory and suffers the commercial loss. Before filing, counsel can identify the registered owner and whether the intended claimant has standing. If the patent was assigned among affiliates, confirm that the transfer was completed and recorded as required. If the Ningbo operating company is only a licensee, the license terms and enforcement authority need review. A defendant will exploit inconsistencies between the entity claiming damage and the entity owning the right.

The same issue arises with jointly owned technology. A university, overseas parent or former founder may still hold an interest. The rights map needs to therefore include not only “what protects this feature?” but “who can enforce it?” Damages evidence should also match the claimant. Lost sales suffered by one affiliate may not automatically be recoverable by another. Cleaning up standing before litigation avoids a procedural dispute that has nothing to do with the accused product.

Damages, interim relief and technical settlement#

Employee evidence can establish the history of development, but it needs corroboration. Engineers who worked on the component can explain why a feature was created and what the supplier received. Their testimony can be important, particularly for trade-secret chronology. But employee recollection should be supported by contemporaneous records. Useful documents include dated CAD files, engineering-change requests, test reports, supplier meeting minutes, emails and prototype records. The company needs to avoid coaching employees into broad statements such as “the supplier could never have developed this independently.” That type of opinion may be difficult to support. A stronger witness explains a specific development event and points to the record created at the time. Former employees may also hold relevant evidence. The analysis should approach them lawfully and preserve communications carefully. Where the technical history spans many years, a development timeline prepared from records can help both experts and the court understand the sequence without relying on memory alone. Damages strategy should begin before liability is established. A claimant often focuses entirely on proving copying and leaves damages until late in the case.

For an industrial component, possible evidence may include lost sales, price erosion, reasonable royalty, defendant profit, saved development cost and other statutory or judicially recognized measures depending on the claim. The finance team should identify affected customers and product margins while records are available. If the supplier undercut price using copied technology, the claimant needs to distinguish ordinary competition from sales plausibly lost because of the unlawful conduct. For trade secrets, the value of the secret and the commercial benefit of accelerated development may be relevant to the damages narrative, but calculations need evidentiary support. The company can also consider litigation cost and business disruption. A technically strong case against a small supplier may not justify years of proceedings if a redesign agreement and compensation can resolve the market problem more effectively. Damages analysis therefore informs settlement as well as judgment. Preliminary relief should be reserved for a defined and urgent harm. The manufacturer may seek evidence preservation, property preservation or conduct-related relief where the legal requirements are satisfied. Emergency applications are strongest when the right and threatened harm are concrete.

For example, a supplier preparing to exhibit the accused component at a major trade show may create an urgent market event. A general allegation that competition will continue is less specific. Trade-secret cases require particular care because the secret must be defined without unnecessarily disclosing it. Counsel should prepare a focused evidence package showing ownership, access, accused conduct and urgency. A weak emergency application can expose the claimant’s case theory early and give the defendant time to design around it. The business team should decide whether the real objective is to stop sales, preserve evidence, recover tooling or bring the supplier back to negotiation. The requested relief should match that objective.

Cross-border ownership, redesign and public evidence#

Settlement can divide the product into protected and redesignable elements. Not every supplier dispute needs to end with complete market withdrawal. A commercially useful settlement may identify which features must be removed, which confidential files must be returned or destroyed and which redesigned components may continue. Technical verification is important. The agreement can require delivery of redesign drawings or inspection by an independent expert without giving the claimant broad access to unrelated supplier technology. If patents are involved, the parties can agree that specified redesigned features are not challenged, without granting a blanket license to future products. For trade secrets, the supplier can certify deletion of identified files and impose obligations on subcontractors that received them. The settlement should also address existing inventory and customers. A precise technical settlement can preserve competition while ending the unlawful use of protected rights. Supplier contracts should create the evidence architecture for the next dispute. Procurement and engineering teams should use contracts that answer ownership questions before collaboration begins.

Key provisions include customer background IP, supplier background IP, project-specific developments, tooling ownership, confidentiality, subcontracting, return/destruction and post-termination use. The contract should identify who owns improvements created jointly. Engineering-change processes should require written confirmation of whether a change affects ownership or license rights. The company can also mark confidential drawings consistently and use controlled data rooms where practical. These controls do more than improve contractual rights. They create the evidence a court will later need to distinguish the customer’s technology from the supplier’s independent know-how. The strongest future litigation file is built during ordinary project management. Open-source and standard-component evidence can narrow the dispute. Industrial products increasingly include standard software, firmware and off-the-shelf components. The claimant can identify which parts of the accused product are genuinely proprietary and which come from public standards or third-party suppliers. A defendant may legitimately use the same standardized connector dimensions, communication protocol or public library. Overclaiming those elements can weaken the case. Technical experts should therefore separate: patented features, trade-secret features, public standards, supplier background technology, and open-source or third-party code.

This separation also helps settlement because the parties can define which elements may continue lawfully. The more precisely the claimant distinguishes its protected contribution from common industry material, the easier it is to explain why the supplier crossed the legal line.

Case analysis and future supplier governance#

Cross-border parent-company rights should be organized before China enforcement. A foreign-invested Ningbo manufacturer may use technology developed by an overseas parent. If the parent owns the patent or secret, China counsel can review: license to the China entity, enforcement authority, confidentiality chain, employee access, and damages allocation. A license executed only after the dispute starts may invite challenge about the claimant’s prior rights. Group companies should therefore maintain written IP licenses and enforcement authority as part of ordinary governance. For trade secrets, the chain of confidentiality matters when information moves from parent to subsidiary and then to supplier. The company needs to be able to show that each transfer remained subject to protection. This governance is especially important in automotive and medical supply chains where the same technology is used across several countries. Product redesign strategy should run in parallel with litigation. Even a strong claimant should consider whether the competitor can design around the asserted patent. If the defendant can remove one feature and remain commercially competitive, litigation may not preserve market exclusivity for long.

The business and engineering teams should therefore model likely redesigns. That analysis can inform whether to emphasize patent, trade secret or contract. It can also shape settlement: the claimant may accept a defined redesign while preserving stronger claims against use of confidential manufacturing data. A rights strategy that anticipates lawful competition is more durable than one aimed only at stopping the current product. Customer communications should be preserved without turning customers into advocates. A manufacturer may learn about the competing product from customers who report unusual similarity. Those communications can help establish market timing and commercial harm, but management can avoid prompting customers to make technical conclusions they are not qualified to support. Useful customer evidence includes quotations, product samples, screenshots, dates of first solicitation and statements about the identity of the seller. Technical similarity should still be established through expert comparison. The claim strategy can preserve those materials promptly because marketplace listings and sales pitches can change after the supplier learns of the dispute. A disciplined file separates customer evidence of market conduct from expert evidence of infringement.

A final pre-filing review should confirm that every asserted right has an owner, an accused feature, supporting evidence and a remedy. If any row in that matrix is vague, narrowing the case is usually stronger than adding another cause of action.

Conclusion#

Manufacturing-copy disputes are strongest when the claimant distinguishes registered rights, confidential information and contractual obligations before filing. The Patent Law provides claim-based protection for inventions, utility models and designs,^[1] while the revised Anti-Unfair Competition Law supplies the current trade-secret framework and evidentiary mechanisms.^[2] The commercial takeaway is that “lookalike” is a factual observation, not a cause of action. The manufacturer needs a rights map, a technical comparison and a development chronology that show exactly what was protected, how the former supplier obtained access and what it later used.

Legal and regulatory sources#

^[1] Patent Law of the People’s Republic of China (2020 Revision): [official source](https://www.npc.gov.cn/npc/c2/c30834/202011/t20201119_308800.html) ^[2] Anti-Unfair Competition Law of the People’s Republic of China (2025 Revision), especially Articles 10 and 39: [official source](https://www.npc.gov.cn/npc/c2/c30834/202506/t20250627_446247.html)

General legal information only; not legal advice for a specific IP dispute.