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About Us

Tsar & Tsai Law Firm is a Taiwan-based partnership engaged in the provision of legal services relating to all aspects of international and domestic business transactions as well as dispute resolution and litigation. The Firm was founded in 1965 by Ruchin Tsar and Paul C. Tsai, and has since grown to its present size of over 50 attorneys admitted to practice in various jurisdictions. Including a staff of translators, paralegals, accountants, and other support personnel, the Firm currently employs a total of over 120 persons and is one of the largest law firms in Taiwan. The Firm's address is 8th Fl., 245 DunHua S. Rd., Sec. 1, Taipei 106, Taiwan, R.O.C.

The Firm has maintained a diverse, international character. Although the majority of its attorneys are ROC nationals, most of them have received formal legal education and training in the United States and elsewhere abroad. In addition, several attorneys of the Firm are foreign nationals who are admitted to practice in, among other jurisdictions, the United States. All attorneys of the Firm are fluent in Chinese and English and several are fluent in Japanese.

Finally, recognizing the importance of legal education, attorneys in the Firm actively serve as adjunct professors in order to further the quality of the profession, and contribute to internationally-known professional and academic journals.

Hsinchu Branch Office


Tsar & Tsai set up a branch office in the Hsinchu Science-Based Industrial Park in November 2007 to provide clients in the greater Hsinchu area with timely and high quality legal services.

Staffed with a team of highly qualified lawyers and professionals, Tsar & Tsai’s Hsinchu Branch Office gives clients in the greater Hsinchu area prompt access to a broad spectrum of capabilities and the branch office can call on resources from across the firm to assist clients in dealing with sophisticated legal issues and disputes. The Hsinchu Branch Office is especially positioned with a strategic focus on Hsinchu area clients’ needs as regards the following intellectual property rights related services:

● Patent Prosecutions

Patent specification drafting (in Chinese and other foreign languages)

Patent filing worldwide

Maintenance of patent rights

Patent infringement analysis

Invalidation and cancellation proceedings

Administrative appeals & litigation

Civil litigation and strategies relating to patent disputes

● Patent Management and Strategies

Patent search

Patent analysis

Patent validity assessment

Patent licensing

Technology transfer and licensing agreements

Compulsory patent licensing

Antitrust and unfair practices relating to patents

Patent management and strategic planning

Dispute resolution

● Corporate Legal Education and Training

Tailor-made training courses and seminars on intellectual property rights and related laws meeting the practical needs of corporate clients.