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RYUKA & PARTNERS (RYUKA国際特許事務所 / RYUKA International Patent Office)
Tokyo prosecution firm known for high-quality, strategically drafted patents.
About
RYUKA & PARTNERS (formerly RYUKA IP Law Firm; Japanese name RYUKA国際特許事務所) is a Tokyo intellectual property firm established in 1998 and based in the Shinjuku L Tower, Nishi-Shinjuku. Its Firm Overview page states 105 total employees including 38 attorneys — 29 Japanese patent attorneys, 1 trademark attorney, 4 design attorneys, 6 US attorneys and 1 Chinese patent attorney — and notes "Nearly all specialists are either attorneys or Ph.D." Its stated services are prosecution of patents, trademarks and designs, patent searches, infringement and non-infringement opinions, negotiation and licensing, and full-service IP consultation from invention harvesting through post-grant IP management.
Strategic positioning
Strategic patent drafting and global prosecution for life-sciences and deep-tech innovators.
Deterministic scores · rules-based, not AI iHow these scores are obtained: each one is computed from this profile's listed attributes — capability checkboxes, certifications, capacity figures and coverage — by a fixed formula, recomputed on every page load. Deterministic and rules-based means the score comes from a fixed, transparent formula over listed attributes — the same inputs always produce the same score. It is not AI: there is no model, no learning, and no hidden weighting. Whether a score is relevant to you depends on your specific project: a capability that raises the number may not matter for your work, and a niche strength your project needs may barely move it. Capability scores are a directional starting point, not a verdict. A lower score does not disqualify a company or consultant, and no decision should rest on the score alone — always contact the company directly to confirm the specifics for your project.
Manufacturing-IP focus iAdds 25 points if the firm declares a manufacturing-IP focus, plus 9 points per manufacturing technology area listed (sterile injectables, biologics, radiopharmaceuticals, biosimilars, drug-device combinations, mRNA/LNP), capped at 45, plus 8 points per manufacturing-IP service (CMC patents, trade secret governance, FTO opinions, patent term extension), capped at 30. Levels: 75+ Manufacturing-IP specialist | 50-74 Manufacturing-active | 25-49 Selective | below 25 Therapeutics-IP focused. Whether this dimension matters for you depends on your specific project.
17Therapeutics-IP focused
Life-sciences IP iAdds 4 points per technology area, capped at 30, plus 5 points per practice area, capped at 25, plus 4 points per jurisdiction, capped at 20, plus up to 25 points for technical depth based on the share of attorneys holding PhDs or advanced degrees. Levels: 80+ Premier life-sciences IP | 60-79 Strong | 40-59 Established | below 40 Emerging. Whether this dimension matters for you depends on your specific project.
60Strong
Technology areas
AI drug discoveryBiologicsDiagnosticsMedical devicesCell & gene therapy
Practice areas
Patent prosecutionPatent portfolio strategyFreedom-to-operate (FTO)IP due diligence
Jurisdictions
JPOWIPO / PCTUSPTOEPOCNIPA
R&
RYUKA & PARTNERS (RYUKA国際特許事務所 / RYUKA International Patent Office)
IP & patent counsel · Japan
Live record · illustrative seed data · scores deterministic, rules-based — not AI.