Chang Tsi & Partners

IAM Research

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Silver - Firms: prosecution

Bronze - Firms: litigation

Perhaps best known for its capacity on the trademark front, Chang Tsi & Partners is also home to a potent patent practice by which many are enthused. Dubbed by one passionate patron as “the best go-to firm in China”, its contingent of high-calibre lawyers consists of former senior judges and patent examiners and possesses “in-depth experience in IP law and great understanding of cross-border elements”. “We appreciate that the firm tailors their advice using terms/expressions and strategies that suit clients from outside of China, so that said client would find it familiar. While it is a Chinese firm, it maintains a well-appreciated global outlook.” Another quality that echoes among the firm’s clientele is its transparent cost structure: “Their responsiveness and cost-effectiveness make a huge impression on me. The work done is very accurate and the cost structure is very transparent.” IP litigator Michael Wu has become an essential part of the patent team, boasting both patent attorney and legal qualifications. Wu has a gift for seeing through conflicts related to mobile telecoms and software.

Firm Profile

Chang Tsi & Partners is a “National Outstanding Law Firm” (as nominated by the Ministry of Justice of China) with a strong reputation in intellectual property and litigation.

Since it was established in 2002, Chang Tsi & Partners has become one of the leading law firms in China. Based in Beijing, and with fully-fledged offices in Shanghai, Shenzhen and branch offices in the US, Europe, Korea, Hong Kong, Taiwan, Guangzhou and Guangxi, Chang Tsi & Partners has established an enviable reputation in intellectual property and litigation with over 350 professionals consisting of attorneys at law, patent attorneys and trademark attorneys.

The guiding principle of Chang Tsi & Partners is to secure clients’ rights in a changing China. Chang Tsi & Partners is a tier-one law firm with a proven track record in intellectual property and dispute resolution. The firm provides the full scope of services from prosecution to litigation for patents, trademarks, copyright, trade secrets and domain names. Chang Tsi & Partners has been recommended by the IAM Patent 1000 for both patent prosecution and enforcement for years. Amazon recognised Chang Tsi & Partners as the most “Up to Speed Quickly” outside counsel. Twitter granted Chang Tsi & Partners the most “Out of the Box” law firm award for its creative legal solutions.


  • Chang Tsi & Partners was awarded the title 2021 China Trademark Firm of the Year by Law Business Research’s Intellectual Asset Management and World Trademark Review.
  • Chang Tsi & Partners has been ranked as a leading firm by Chambers Asia Pacific for several consecutive years and recommended as a Top-Tier Intellectual Property Firm by The Legal 500 Asia Pacific, also for several consecutive years.
  • Founding partner Spring Chang has been recognised as a Band 1 IP Lawyer in China by Chambers Asia Pacific, a 2022 Band 1 Lawyer in Intellectual Property (non-litigation) by Chambers & Partners, and Elite Practitioner in intellectual property by Asialaw Profile.
  • Chang Tsi & Partners was recognised as 2021 China Employer of Choice by Asian Legal Business.

International outlook

As a professional law firm with foreign-related intellectual property as its core practice, the firm’s business needs are facing the world. As more and more foreign brands enter China and Chinese corporations begin their expansion into foreign markets, Chang Tsi & Partners has built a large pool of international clients ranging from start-ups to Fortune 500 companies in industries as diverse as aviation, mining, fashion and beauty, manufacturing (ITW, Ingersoll Rand, Honeywell, Britax), electricity, and food and beverages.

Chang Tsi & Partners enjoys longstanding and close cooperation with hundreds of renowned law firms across the Asian-Pacific region, Europe and America. We have established partnerships with local offices in more than 130 countries. This has enabled the firm to assist clients around the world in a timely and efficient manner.

Intellectual property

Intellectual property is a core focus at Chang Tsi & Partners. The firm’s IP practice is distinguished by its significant patent, trademark, copyright and domain name victories in both contentious and non-contentious matters for leading international organisations. The firm provides comprehensive, one-stop, multi-level legal services.


Chang Tsi & Partners has a strong and growing patent practice and its skilled attorneys process all aspects of patent prosecution and enforcement, including invention patents, utility model patents, design patents, trade secrets, product packaging and decoration, plant varieties, integrated circuit layouts and patent management and transfers, as well as other patent-related matters, including unfair competition. Our attorneys have backgrounds in science, engineering and law. They are well qualified, having passed both the law and the patent bar exams in China and overseas. Two of our patent practitioners passed the US Patent Bar exam.

Chang Tsi & Partners’ services include:

  • consultation on patent prosecution and enforcement strategies;
  • drafting, review and amendment of legal documents for patent assignment and licensing;
  • patent searches and monitoring;
  • patent applications for inventions, utility models and designs;
  • re-examinations and invalidations;
  • administrative litigation;
  • customs recordal and training services;
  • investigation of patent infringement, including evidence collection;
  • patent infringement litigation;
  • negotiation and other legal services relating to patent licensing and assignment;
  • patent annuity payment and docketing services;
  • patent opinions, including invalidity, non-infringement and freedom-to-operate opinions;
  • legal services and negotiations on licensing and transfers; and
  • design and implementation of global patent protection and licensing strategies.
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