Soei Patent & Law Firm

Founded in 1986, SOEI Patent and Law Firm is a leading Japanese legal practice specializing exclusively in intellectual property (IP) law. With a steadily growing team now comprising 315 members—including 119 patent attorneys (Benrishi) and 4 attorneys-at-law—SOEI offers a full range of IP legal services tailored to clients doing business in Japan.

SOEI’s practice covers all major areas of IP, including patents, designs, trademarks, and copyrights. Our patent team handles a broad array of technical fields such as electronics, mechanics, chemistry, software, and biotechnology. This enables us to manage even highly complex innovations with technical depth and legal precision.

In addition to prosecution, SOEI has significant expertise in enforcement. Our litigation team, led by a former Chief Judge of the Intellectual Property High Court of Japan, provides strategic and effective representation in disputes such as infringement litigation, invalidation trials, and appeals.

SOEI is also known for the reliability and accuracy of its administrative operations. Our seasoned staff ensures that all procedures—from filings and renewals to formality checks and translations—are completed precisely and on time. Clients can count on our internal systems and dedicated teams to minimize risk and avoid costly errors.

We also place great importance on clear and timely communication. Our professionals are trained to respond promptly and proactively, ensuring smooth collaboration across time zones. We value close relationships with our clients and strive to anticipate their needs.

Committed to excellence, responsiveness, and dependable execution, SOEI remains a trusted partner for securing and defending intellectual property rights in Japan’s complex legal landscape.

Key practice areas: 

Copyright, Copyright & related rights, Designs, Intellectual property, Intellectual property (contentious), Intellectual property (prosecution), IP transactions, Life sciences IP, Patent, Patent (contentious), Patent (prosecution), Trade mark, Trade mark (contentious), Trade mark (prosecution)

Key Sector Expertise:

Advertising, Agriculture, Artificial intelligence, Automotive, Biotechnology, Chemical, Computer technology & services, Construction and materials, Consumer goods and services, E-commerce, Electrical, Electronics, Energy, Fashion & luxury goods, Film, Financial services, Food and beverage, Furniture, Gaming, Healthcare, ICT & software, Industrials, Instruments, Internet, Life sciences, Manufacturing, Mechanical, Medical device, Oil and gas, Optics & photonics, Pharmaceutical, Professional services, Retail, Robotics, Semiconductors, Social infrastructure, Technology hardware, Telecommunication, Tobacco, Transport