Chang Tsi & Partners has extensive experience and a well-established network for handling patent matters across Asia. We assist clients with patent filing, prosecution, maintenance and enforcement across Asian jurisdictions, supported by qualified patent attorneys and dedicated professionals covering a broad range of technologies. Our close collaboration with local associates and intellectual property authorities enables us to provide efficient and reliable support throughout the region.
Our patent team combines strong technical and legal expertise, with backgrounds in electrical engineering, mechanical engineering, telecommunications, biotechnology, pharmaceuticals and chemistry. More than one-third of our professionals hold both legal and patent-agent qualifications, and the team includes former CNIPA examiners and professionals with international experience. With capabilities in English, Japanese, Korean and German, together with more than 20 in-house investigators, we provide integrated prosecution and enforcement support across major jurisdictions, with particular strength in Greater China and Asia.
Patent Drafting, Searches & Prosecution: We help clients identify patentable innovations and develop strategic portfolios aligned with their business objectives. Our services include patentability and prior-art searches, freedom-to-operate (FTO) analysis, patent watch and competitor monitoring, portfolio audits and diagnostics, as well as drafting and prosecution of invention, utility model and design patent applications. We also handle English drafting for standard-essential patents, PCT applications and international filing strategies, third-party observations, and annuity and rights maintenance.
Reexamination & Invalidation: We represent clients in patent reexamination and invalidation proceedings, providing end-to-end support including prior-art searches, technical analysis, evidence preparation and legal argumentation. Our team also handles related administrative litigation and has extensive experience in technically complex and high-stakes matters for clients in Greater China and overseas.
Enforcement & Litigation: We assist clients in building strong evidentiary cases through market investigations, evidence preservation and notarized evidence collection. Our services include administrative complaints, customs recordal and enforcement, complaints involving exhibitions and e-commerce platforms, civil and criminal litigation, standard-essential patent licensing and FRAND disputes, as well as cross-border enforcement.
Licensing, Transactions & Commercialization: We advise on the commercialization of patent rights through licensing, assignments, equity contributions and pledges. Our services include drafting, reviewing and negotiating related agreements, patent valuation, revenue-sharing arrangements, antitrust compliance and technology transfer. Our patent litigators also have extensive experience in negotiation, settlement and licensing transactions, with a focus on commercially effective outcomes.
