Sonoda & Kobayashi Intellectual Property Law

What Sonoda & Kobayashi Intellectual Property Law does

Sonoda & Kobayashi Intellectual Property Law is a Tokyo-based partnership IP law firm founded in 1998 by Yoshitaka Sonoda and Yoshinori Kobayashi. It provides intellectual property legal services across patents, trademarks, designs/utility models, litigation (oppositions, nullity actions, infringement), translation, annuity payments, and licensing/due diligence, with technical coverage spanning machinery, electronics, chemistry, IT/business methods, and biotechnology/pharmaceuticals. The firm operates from the Shinjuku Mitsui Building in central Tokyo and runs a Beijing office (Sonoda & Kobayashi Beijing IP Group, established 2021) and a Kyushu branch in Fukuoka (opened October 2025).

The firm's core offering is professional representation before the Japan Patent Office and Chinese IP authorities, supplemented by a multilingual translation team covering Japanese, English, Chinese, German, French, Dutch, Russian with native speakers of 8 languages. Approximately 130 experts staff the firm, including licensed Japanese and Chinese patent attorneys, several with doctoral degrees, paralegals, and a translation team with more than 20 years of IP translation experience. Sonoda & Kobayashi has been ranked in the IAM Patent 1000 from 2019 through 2026, and Managing Partner Dr. Yoshitaka Sonoda has been individually ranked in the publication each year since 2016.

Revenue is generated primarily through fee-for-service billing on patent prosecution, trademark registration, litigation, translation, and annuity payment management, principally for international corporations seeking Japan and China IP protection. The firm runs a sales-led professional services model with content marketing (multilingual website, bimonthly newsletters, webinars), seminars, and industry events. Internal restructuring in January 2015 separated the legal practice (Sonoda & Kobayashi Intellectual Property Law) from Sonoda & Kobayashi IP Services Inc., which provides administrative and translation support functions. The firm is privately held as a partnership with no external institutional investors identified.

Name

Sonoda & Kobayashi Intellectual Property Law

Legal name

Sonoda & Kobayashi

Website

https://patents.jp

Company type

Private

Founded year

1998

Operating status

Operating

Short description

Sonoda & Kobayashi is a Tokyo-based IP law firm serving international clients with patent and trademark prosecution, litigation, translation, and annuity services across Japan and China, with 130 experts and offices in Tokyo, Beijing, and Fukuoka.

Ownership category

akta.pro rank

Product category

Intellectual Property Legal Services

NAICS

Offices of Lawyers (541110), Legal Services (5411), Offices of Lawyers (54111)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Intellectual Property (IP) Law (BPAHAAAF)

akta.pro secondary industries

Patent Prosecution & Portfolio Management (BPAHAMAA), Trademark Prosecution & Brand Protection (BPAHAMAB), IP Litigation & Dispute Resolution (BPAHAMAE), IP Filing, Annuities & Renewals Administration (BPAHAMAJ), IP Compliance, Anti-Counterfeiting & Enforcement (BPAHAMAK)

Keywords

• Patent prosecution services
• Intellectual property law
• Trademark registration
• IP litigation services
• Technical translation services

Headquarters

HQ city

Shinjuku

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Infrastructure, Others

Revenue model

1. Patent Prosecution Services: Filing and prosecution of patent applications in Japan, handling examination procedures, office actions, and patent acquisition.
2. Trademark Services: Trademark registration, protection, and enforcement in Japan and China.
3. Legal Actions and Litigation: Opposition proceedings, nullity actions, infringement litigation, and dispute resolution.
4. Translation Services: Technical translation between Japanese, English, Chinese, German, French for IP documents.
5. Annuity Payment Services: Annual fee payments to maintain patents and trademarks in force.
6. Licensing and Due Diligence: License negotiations, IP valuation, due diligence for M&A transactions.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels7 records

Core offering

Sonoda & Kobayashi Intellectual Property Law is a Japanese IP law firm providing comprehensive intellectual property services. Core offerings include patent prosecution and litigation across multiple technology domains (machinery, electronics, chemistry, IT, biotechnology/pharmaceuticals), trademark and design/utility model services, and legal actions (oppositions, nullity actions, infringement litigation). Supporting services include technical translation across five languages, annuity payment management, expert opinions, licensing negotiations, due diligence, and patent term extension for pharmaceuticals.

Product overview

Sonoda & Kobayashi Intellectual Property Law is a Japanese IP law firm providing comprehensive intellectual property services. The core offerings include patent prosecution and litigation across multiple technology domains (machinery, electronics, chemistry, IT, biotechnology/pharmaceuticals), trademark and design/utility model services, and legal actions (oppositions, nullity actions, infringement litigation). Supporting services include technical translation across five languages (Japanese, English, Chinese, German, French), annuity payment management, expert opinions, licensing negotiations, due diligence, and specialized patent term extension for pharmaceuticals. The portfolio is organized as a unified service offering rather than a modular software platform.

Differentiator

Problem solved

Functional benefit

Products and services

• Patent Services Comprehensive patent prosecution, litigation, and advisory services covering machinery, electronics, chemistry, IT/business methods, and biotechnology/pharmaceutical domains for international corporations seeking IP protection in Japan and China.
• Trademark Services Trademark registration, protection, and dispute resolution services in Japan and internationally for companies seeking brand protection.
• Design/Model Services Industrial design and utility model registration and protection services in Japan for companies seeking design rights protection.
• Translation Services Technical and legal translation services supporting Japanese, English, Chinese, German, and French languages for IP documentation, supporting cross-border patent and trademark filings.
• Legal Actions and Litigation Patent oppositions, nullity actions, infringement litigation, and dispute resolution before Japanese courts and the Japan Patent Office for clients enforcing or defending IP rights.
• Annuity Payment Services Maintenance fee and renewal payment management for patents, utility models, designs, and trademarks before the Japan Patent Office.
• IP Advisory and Due Diligence Expert opinions, validity assessments, freedom-to-operate analyses, licensing negotiations, and M&A due diligence support for IP-related business decisions.
• Patent Term Extension Services Specialized services for extending pharmaceutical patent terms in Japan through regulatory liaison with local clinical trial partners.

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• Capital Intellectual Property Association of ChinaminorStrategic or Co-development Partner · 21 May 2026Joint seminar organizer for educational events on IP topics. Wataru Otani presented a seminar jointly organized with this association titled 'Tips for Prosecuting Software Invention Patents (including AI-related Inventions) in Japan.'

Scale indicators4 records

Recent moves13 records

Expansion highlights5 records

Broad incumbents

• TMI Associates: Large full-service Japanese law firm with a sizable IP practice including prosecution, litigation, and cross-border filings; broad incumbent offering overlapping capabilities.
• Unitalen Attorneys at Law: Major Chinese IP law firm with global filings and litigation capabilities; large incumbent overlapping with the firm's cross-border patent and trademark work.
• CCPIT Patent and Trademark Law Office: China's largest state-affiliated IP practice with full prosecution, trademark, and litigation capabilities; broad incumbent across the China side of Sonoda & Kobayashi's market.

Direct peers

• Tsubame International Patent Office: Japanese IP boutique with deep prosecution and international translation practice; directly comparable as a mid-sized, multilingual Japanese patent firm serving multinational clients.
• Shiga International Patent Office: Tokyo patent firm covering IP prosecution, litigation and translation across technical fields; directly comparable mid-sized Japanese IP practice.
• Lung Tin International Patent Agent: Major China-based IP firm with international filing practice; comparable as the cross-border (Japan–China) counterpart to Sonoda & Kobayashi's Beijing operations.
• Hiraki & Associates: Boutique Japanese IP law firm serving foreign clients with prosecution and litigation; comparable in focus on international clients and patent/trademark services.
• Kubota Patent Office: Established Japanese patent firm offering prosecution across mechanical, electrical, and chemistry domains with international filing services; comparable in scale and client profile.
• Asamura Patent Office: Mid-sized Tokyo IP boutique with multi-disciplinary technical prosecution; comparable in size, technical coverage and cross-border filings focus.
• Yuasa and Hara: Long-established Tokyo IP and patent law firm offering prosecution, litigation and translation; highly comparable in services, clientele and cross-border model.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/SonodaKobayashi

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles16 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sonoda & Kobayashi Intellectual Property Law