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About

Uncover and leverage your intellectual assets.

Every company has strengths. But those strengths often go unrecognized by the company itself. We help you see them, and use your IP strategically.

Why Seiju
What we value.
01

Our firm that puts intellectual assets to work

Every company has its own strengths, yet they often go unrecognized as simply ordinary. By recognizing the intellectual assets behind those strengths and using the resulting IP strategically, a company can gain a competitive edge. We help clients see their strengths and build strategies that put their intellectual assets to work.

02

A global perspective

It is increasingly hard to secure profit through domestic business alone. Depending on overseas production and multi-country trade, planning foreign patents, trademarks, and know-how protection from a broad perspective is essential. Working with external experts, we build strategies that leverage Japan's strengths worldwide.

03

Committed to better results, with integrity

Invention grows from the wish to improve life; a brand rests on trust. Intellectual property is, in essence, a property of the heart. We work with integrity to carry that value forward so that society may grow.

04

Building the ground for innovation through our Innovation Network

Innovation comes not from control or expectation but from a free mind. We Japanese have absorbed other cultures and built our own. To make the most of that trait, we cultivate the ground for innovation through a human network of people with different backgrounds — in R&D, product planning, distribution, and more.

Our Attorneys
Our Patent Attorneys

Patent attorneys from different fields work together as each case requires. See each attorney's fields, career, and activities under “View full profile.”

K
Managing Partner / Patent Attorney
Koji KITAMURA
Osaka HQ / Tokyo Ichigaya / Tokyo Ueno / Naha
Valuation & Trade Secrets

Patents and utility models in electrical, electronic, physics, systems, and mechanical fields, plus designs and trademarks — filing, appeals, and searches. Also strategy and consulting that leverage intellectual assets such as trade secrets and brands.

Career

  • 1985 Graduated, Dept. of Mechanical Engineering, Faculty of Engineering, Osaka University
  • 1985 Joined a printing company (Development Division)
  • 1988 Worked at an international patent firm
  • 1992 Registered as a patent attorney
  • 1992 Established Kitamura Koji Patent Office (now Seiju IP Firm)
  • 2009 Accredited for specified infringement litigation representation

Main Fields

Filing and appeals for domestic and overseas patents and utility models (electrical, electronic, systems, physics, mechanical), designs, and trademarks / prior-art searches / IP valuation and consulting / trade secret protection strategy and consulting

Public Activities

  • Production Technology Promotion Association (Executive Director, Alliance Committee Chair), 2012–
  • Japan Patent Attorneys Association (JPAA), Unfair Competition Prevention Committee (Chair, FY2015), 2013–
  • JPAA, Agriculture-Forestry-Fisheries IP Committee, 2022–
  • JPAA, Technology Protection Text Committee (member), 2017–
  • JPAA, Timestamp Working Group (member, lecturer), 2016–2018
  • JPAA, IP Management Center (Know-how Valuation Group), 2017–
  • JPAA, IP Valuation Promotion Center (Deputy Chair of the founding committee, etc.), –2016
  • JPAA, Technical Standards Committee (member), 2015–2017
  • JPAA, Special IP Class lecturer, 2012–2016
  • JPAA, Training Institute (e-learning lecturer), 2004–2010
  • JPAA, IP Support Center (founding committee onward; Deputy Chair, etc.)
  • JPAA Kinki Branch, Venture Support Committee
  • Kansai University, Faculty and Graduate School of Commerce, part-time lecturer, 2016–2017
  • Japan Fair Trade Commission, Antimonopoly Policy Cooperator, 2022–
  • Japan Digital Trust Forum (JDTF), Advisor

Memberships

JPAA / JPAA Kansai / JPAA Kanto / Japan Intellectual Property Association (academic) / Kansai Patent Study Group / Production Technology Promotion Association / Osaka Junior Chamber Senator Club / Institute for IP Utilization Strategy / Japan Digital Trust Forum (JDTF) / Osaka Chamber of Commerce and Industry / Osaka Chuo-ku Ethics Corporation Association

Publications

  • “JPAA 100th Anniversary, Kinki Branch: Patent, Utility Model, Design & Trademark Q&A” (Nikkan Kogyo Shimbun, co-authored)
  • “Economic Valuation of Intellectual Property” (JPAA new-member continuing training, FY2004–2010 e-learning)
  • “Activity Report of the JPAA Special Division: Toward Diverse IP Valuation Services Expected of Patent Attorneys” (Patent journal, 2008, co-authored)
  • “Guide to IP Valuation by Patent Attorneys” (JPAA Valuation Promotion Center, 2010, co-authored)
  • “Chained Creation and the Patent System” (Japan IP Association, FY2004 research presentation C62)
  • “Market Examination” (Japan IP Association, FY2005 research presentation 1D17)
  • “Visualizing Invention Elements” (Japan IP Association, FY2005 research presentation 2E12)
  • “IP Valuation in Business Strategy” (Japan IP Association, FY2008 research presentation, JPAA, co-authored 1A7)
  • “IP Valuation and Consulting through the Hermit IP Utilization Meeting” (Japan IP Association, FY2009 research presentation, JPAA, co-authored 2G5; also presented in 2011, 2012, 2015, 2016, 2017)
  • “Points to Note When Recording Technical Information as Trade Secrets — Using Timestamps to Protect Trade Secrets” (Patent, March 2017, FY2015 Unfair Competition Prevention Committee, co-authored)
  • “Patent Stocktaking and Rights Strategy” (Technical Information Institute, 2017, co-authored)
  • “Supporting the Use of Intellectual Creations through Documentation and Evidence” (JPAA), 2026

Lectures

  • Academic presentations (Japan IP Association, above)
  • Coordinator at the Production Technology Promotion Association (above)
  • “IP Valuation” (JPAA member training)
  • “The Future of IP Valuation” (JPAA member training)
  • “Drafting and Interpreting Claims” (JPAA Training Institute, new-member seminar)
  • “Expectations from IP Practice toward IP Legislation” (Legislative Policy Forum)
  • “IP Strategy Seminar for IT Ventures” (hosted by the Ministry of Internal Affairs and Communications, Osaka Joint Government Building)
  • “Patent Workshop at the Working Women's Center” (JIII Nara Branch)
  • “Capturing and Efficiently Protecting Inventions in R&D” (Akashi College)
  • “Management That Makes the Most of Inventions” (Otemae RC)
  • “Refining Inventions and Passing the Baton to Marketing” (Shiki Club)
  • “Using IP in Corporate Business Strategy” (LEC Umeda)
  • “The Work of Patent Attorneys and IP Utilization” (Doshisha University, Dept. of Sociology / Industrial Relations)
  • “IP Valuation from a Patent Attorney's Perspective” (Osaka Bar Association)
  • “The Patent Attorney Profession and IP Utilization” (Osaka University)
  • “Invention Analysis and Linking to Marketing (TRIZ)” (Kyoto Institute of Technology)
  • “Points on Trade Secret Protection in Joint Research and Transactions” (Japan Digital Trust Forum), July 2016
  • “IP Protection and Digital Trust” (JPAA Kansai × INPIT-KANSAI online seminar), October 2023
  • “Recognizing Technical Know-how and Preventing Leaks” (Miyagi Prefectural Industrial Technology Center, Miyagi IP Seminar), December 2023
  • “Telling Safe from Unsafe Know-how to Share — How to Identify Key Know-how and Show Its Value” (Hatsumei Tsushin, special web seminar), January 2024
  • “Introductory Seminar on Using Timestamps to Secure Evidence of IP Data” (Osaka JIII / INPIT Osaka IP Support Desk), 2024
  • “Revitalizing the GI System with an IP Mix — Using Trade Secrets to Spread Products and Sustain Competitiveness” (MAFF GI Utilization Seminar), March 2024
  • “Key Points for Judging Whether to Patent or Keep an Invention Secret” (Management Support NPO Club, 48th web seminar), May 2025
  • “Introductory Seminar on Using Timestamps to Secure Evidence of IP Data 2025” (Osaka JIII)
  • “Supporting the Use of Intellectual Creations through Documentation and Evidence” (JPAA Training Institute), January 2026
  • “Business Opportunities in the AI Era and Their IP Protection” (Osaka Chamber of Commerce and Industry, Production Technology Promotion Association, 15th Friendship Salon), March 2026
T
Deputy Managing Partner / Patent Attorney
Toshio TAKAO
Osaka HQ / Tokyo Ichigaya / Tokyo Ueno
Chemistry / Machinery / Software

Handles patents, utility models, and design applications mainly in chemistry, machinery, and software. Also handles foreign patent and design applications, including PCT filings.

Career

  • 1998 Graduated, Dept. of Materials Science, Faculty of Engineering and Design, Kyoto Institute of Technology
  • 1998 Joined an auto parts manufacturer
  • 2000 Left the company
  • 2002 Joined the former Kitamura Koji Patent Office (now Seiju IP Firm)
  • 2006 Registered as a patent attorney

Main Fields

Chemistry, machinery, software

Memberships

JPAA / JPAA Kinki Branch / Kansai Patent Study Group

Public Activities

  • JPAA Kansai, General Affairs & Planning Committee (2026–)
  • JPAA Kansai, IP Consulting Steering Committee (2024)
  • JPAA Kansai, Regional IP Revitalization Committee (2023)
M
Patent Attorney
Koichiro MATSUMOTO
Naha / Tokyo Ichigaya / Osaka HQ
M&A / IP Valuation / Tax

IP valuation, valuation of IP-utilization businesses, advisory on IP-based corporate value collateral, support for IP-based business planning, and cybersecurity advisory.

Career

  • 1989 Graduated, Dept. of Mathematical Engineering, Faculty of Engineering, University of Tokyo
  • 1989 Joined Sumitomo Marine & Fire Insurance (now Mitsui Sumitomo Insurance), Accounting Dept.
  • 1996 Seconded to the Industrial Bank of Japan Research Dept. (now Mizuho Bank / Mizuho Research)
  • 1998 Returned to Sumitomo Marine & Fire Insurance, Financial Planning Dept.
  • 2001 Left Sumitomo Marine & Fire Insurance; joined PwC FAS (now PwC Advisory)
  • Served in actuarial services, business turnaround services, and valuation services
  • 2005 Registered as a patent attorney
  • 2012 Left PwC Advisory
  • 2013 Established IP Valuation Patent Office

Main Fields

IP valuation (patents, trademarks, copyrights, know-how) / IP-based financing support (preparing IP business valuation reports, proposals, and reports; use of corporate-value collateral; support for IP-based business planning)

Public Activities

  • JPAA, IP Valuation Promotion Center, 2006–2012, 2015–2017
  • JPAA, IP Distribution & Liquidity Committee, 2012–2013
  • JPAA, IP Utilization Promotion Committee, 2013–2014
  • JPAA, Training Institute, 2013–2014
  • JPAA Kanto Branch, SME & Venture Support Committee, 2015–2016
  • JPAA Kanto Branch, CPA Collaboration Committee, 2015–2020
  • JPAA Kanto Branch, Kanto Caravan, 2015–2016
  • JPAA, Management Center, 2017–2024
  • JPAA Kyushu, Secretary, 2023–2024
  • JPAA Kyushu, Okinawa Committee, 2021

IP Finance Program (Japan Patent Office)

For the Japan Patent Office IP finance program (https://chizai-kinyu.go.jp/), he has served as an expert since its launch, preparing annual reports for financial institutions on their clients' businesses from an IP perspective. By the end of March 2026, he had prepared and submitted 135 IP business valuation reports, proposals, and reports for 75 financial institutions nationwide.

Memberships

JPAA / JPAA Kyushu / JPAA Kanto / JPAA Kansai / Japan Intellectual Property Association / Okinawa Invention Association / Naha Chamber of Commerce and Industry

Qualifications

Patent Attorney (No. 14198) / Certified Member Analyst of the Securities Analysts Association of Japan (CMA) / Registered Information Security Specialist (No. 6551) / AIPE Certified IP Analyst

Publications

  • “IP-Based Financing,” IP Management (Japan Intellectual Property Association), Vol. 66 No. 4, 2016
  • “Toward Diverse IP Valuation Services Expected of Patent Attorneys (JPAA IP Valuation Promotion Center Special Division Report),” Patent (JPAA journal), Vol. 60 No. 1, January 2007 (co-authored)
  • Global IP Strategy Forum 2016 (hosted by the Japan Patent Office), panel discussion “IP and Financing for Global Ventures,” panelist
  • “Survey Report on IP and Intangible Asset Governance” (IP Governance Study Group), IP Strategy Headquarters / Review Committee on Effective Disclosure and Governance of IP Investment and Utilization Strategy (23rd), March 22, 2024 (co-authored)
  • “Survey Report on the Practice of IP and Intangible Asset Governance (FY2025)” (IP & Intangible Asset Governance Association), IP Strategy Headquarters / Review Committee (28th), March 6, 2026 (co-authored)
  • “Introduction to IP and Intangible Asset Governance,” Chuokeizai-sha, 2024 (co-authored)
  • “How to Write the IP Business Reports Financial Institutions Want” (FY2025 IP Finance Program final report meeting), March 2026, online
I
Patent Attorney
Mitsuru Ito
Tokyo Ichigaya
Telecom / Semiconductors / Foreign Filings

Domestic and overseas patents, utility models, and business-method patents. Broad coverage of advanced fields including communications, semiconductors, power electronics, control, image processing, and encryption/authentication.

Career

  • 1986 Graduated, Dept. of Electrical Engineering, Faculty of Engineering, Tohoku University; part-time lecturer at Tohoku Medical College
  • 1988 Completed M.Eng., Electrical & Communication Engineering, Tohoku University; joined Mitsubishi Electric (Computer Works) and Horizon Research Inc. (Boston), a Mitsubishi Electric subsidiary
  • 1991 Worked at Yoshida Kanayama Ishida International Patent Firm
  • 1996 Registered as a patent attorney (No. 10901)
  • 1997 Completed the European Patent Training Course at Mewburn Ellis (UK)
  • 1998 Established Ito International Patent Office
  • 2005 Accredited for specified infringement litigation representation
  • 2016 Established Ito Yoshida International Patent Office
  • 2020 Joined Seiju IP Firm
  • 2026 Appointed technical advisor to the IP High Court

Main Fields

Domestic and overseas patents, utility models, and business-method patents

Technical Fields

Communications engineering, mobile and mobile-terminal communications, network technology, UTM and other operational technology, encryption/authentication, electrical circuits, electrochemistry, electronic circuits, semiconductor engineering and device fabrication / power electronics, power conversion, power conditioners, power regeneration / control engineering, coding theory, numerical analysis, simulation, information engineering, image processing, object tracking/detection and person authentication, CAD and robot control, biometric authentication / gaming machines, toys, gaming methods, medical electronics (EMG/ECG analysis, MRI image processing, etc.) / advertising systems, security-policy technology / acoustics, surface-wave devices, optical-system theory / design and trademark applications

Foreign Patent Applications

U.S., Europe, Russia, China, Korea, Taiwan, Singapore, Brazil, India, PCT international applications, and others

Foreign Trademark Applications

U.S., Europe, China, Taiwan, Korea, Singapore, Madrid Protocol filings, and others

Memberships

JPAA

Papers

  • “A Secret Sharing Scheme Realizing General Access Structures,” IEICE Transactions A, Vol. J71-A, No. 8
  • "Multiple Assignment Scheme for Sharing Secret", Journal of Cryptology (U.S.A.), (1993), 6
  • Presented in Technical Session 3B at the IEEE/IEICE Global Telecommunications Conference & Exhibition 1987 (GLOBECOM '87), Tokyo, 1987
  • Received the IEICE Paper Award (1988)
H
Patent Attorney / Attorney at Law / Judicial Scrivener
Takuya HASEGAWA
Tokyo Ichigaya / Osaka HQ
Legal / Turnaround / M&A

Patent Attorney (Seiju IP Firm) / Attorney at Law (Kyoei Legal Office) / Judicial Scrivener (Kyoei Judicial Scrivener Office). Covers IP legal affairs and contracts (English available) through business turnaround, M&A, and corporate restructuring across all three qualifications.

Career

  • 1995 Graduated, Faculty of Law (constitutional law), Hitotsubashi University
  • 1996 Tamaki Judicial Scrivener Office (registered assistant)
  • 1998 Qualified as a judicial scrivener (completed 1997 central training of the Japan Federation of Shiho-Shoshi Lawyer's Associations)
  • 2000 Legal apprentice, Legal Training and Research Institute of the Supreme Court (completed 2000)
  • 2003 Registered as an attorney (Daini Tokyo Bar Association); Atsumi & Usui Law Office
  • 2004 Usui Sogo Law Office
  • 2008 Registered as a patent attorney
  • 2008 Founded Hasegawa Sogo Law Office (now Kyoei Legal Office)
  • FAS Consulting Co., Ltd., Representative Director (current)
  • Chiba Bethany Home (social welfare corporation), Chair (current)
  • Joseph Welfare Management Assist (general incorporated foundation), Representative Director (current)

Main Fields

Business turnaround, liquidation, and insolvency / M&A and corporate restructuring / corporate legal affairs / IP legal affairs / financial legal affairs / real estate legal affairs / contracts (international business transactions — English available) / labor law / divorce / inheritance

Public Activities

  • Chiba Bethany Home (social welfare corporation), Chair
  • Joseph Welfare Management Assist (general incorporated foundation), Representative Director
  • Legal Training and Research Institute of the Supreme Court, Civil Advocacy Instructor, 2015–2018
  • Bar examination examiner (civil law), 2019–2023
  • Omiya Law School, part-time lecturer (Gender and Law), 2005–2015
  • Obirin University, part-time lecturer (Financial Instruments and Exchange Act), 2010–2011
  • Japan Federation of Bar Associations, IP Center, secretariat member
  • National Insolvency Lawyers Network, member
  • Daini Tokyo Bar Association, Committee on Gender Equality, member
  • Daini Tokyo Bar Association, Gender Equality Headquarters, member

Memberships

Daini Tokyo Bar Association / Japan Federation of Bar Associations / JPAA / Lawyers' IP Network / National Insolvency Lawyers Network / FAS Consulting Co., Ltd., Representative Director

Publications

  • “Revised & Expanded: Q&A on Everyday Legal Knowledge for Difficult Times,” Seibunsha, 2015 (co-authored)
  • Manga “President, Am I Really in Charge of Legal Affairs?” Seibunsha, 2015 (co-authored)
  • “Q&A Business Turnaround Handbook,” Seibunsha, 2012 (co-authored)
  • “Q&A on Everyday Legal Knowledge for Difficult Times,” Seibunsha, 2011 (co-authored)
  • “New Edition, Expanded: How to Draft Various Business Contracts,” Seibunsha, 2009 (co-authored)
  • “New Bankruptcy Act: Procedures and Practice Q&A,” Seibunsha, 2004 (co-authored)
  • “Civil Rehabilitation Act Form Collection (3rd ed.),” Shinzansha, 2004 (co-authored)
  • “Toward Diverse IP Valuation Services Expected of Patent Attorneys (JPAA IP Valuation Promotion Center Special Division Report),” Patent (JPAA journal), Vol. 60 No. 1, January 2007 (co-authored)
  • “Investment/Lending and IP (CPA Practice and IP — from a Patent Attorney's View),” Accounting & Audit Journal (JICPA), Vol. 22 No. 5, May 2010
  • “M&A and IP (CPA Practice and IP — from a Patent Attorney's View),” Accounting & Audit Journal (JICPA), Vol. 22 No. 6, June 2010
  • “Essential Legal Basics for New and Junior Employees in Business,” Forum-M Business Topics (Mizuho Research member magazine), March 2011
  • “Legal Trends in Office Leasing and Handling Trouble by Case,” Forum-M Business Topics (Mizuho Research member magazine), October 2010
  • Legal column, Hamagin Research Management Support News (member magazine), April 2004–March 2012
  • “Gender Bias in the Judiciary: Case Studies, Revised Edition,” Akashi Shoten, 2009 (co-authored)
  • “Problems in Calculating Employee-Invention Compensation under IFRS,” in Nobuhiro Nakayama et al. (eds.), “Toward an IP-Based Nation: In Honor of Prof. Minoru Takeda” (JIII, 2013)
Business alliance with the Kyoei Law Group. With attorneys, judicial scriveners, and labor consultants on hand, we support you end to end — from planning and development to dispute resolution.
Brand Mind
The Philosophy Behind Our Name: "誠樹 (Sei ju)"

Just as a tree (樹) drives its roots deep into the earth to grow naturally, we believe that Intellectual Property (知財)—which is essentially the "wealth of the mind"—must also take root in society to deliver true value. With this ultimate goal of cultivating growth (樹) in mind, we approach every case and client with the utmost sincerity and professional integrity (誠).

To be a guide who spreads to the world the “treasures” born of Japanese values — values shaped through dialogue with nature — we coined the word “Seiju” (誠樹) and wrote it as “Seiju” so that people abroad can understand it too.

The logo depicts the letter “S,” meaning sincerity("Sei"誠), rooting into the soil of the Innovation Network and growing naturally like a tree.

Offices
Offices
Osaka Head Office
AP Bldg., 4-5-14 Nishitenma, Kita-ku, Osaka 530-0047 (built and relocated 2024) / Tel 06-6363-0566
Tokyo Ichigaya Office
Hitokuchizaka TS Bldg. 4F, 4-3-32 Kudankita, Chiyoda-ku, Tokyo 102-0073 / Tel 03-6261-6761
Tokyo Ueno Office
Horiaki Tokyo Bldg., 1-2-1 Ueno, Taito-ku, Tokyo 110-0005 / Tel 050-5807-5567
Naha Office
COI Naha Bldg. 5F, 2-3-15 Kume, Naha, Okinawa 900-0033
Philosophy
Wisdom and know-how are Japan's soil.

On-site wisdom, technology, sensibility, and a culture of craftsmanship — if business results are the crop, protecting the soil that grows them is what leads to Japan's future. We protect a sensibility that resonates with nature, in the form of IP, for the next generation.

Let's start by organizing your thinking.