Overall rank by patents
#1,558
Across all tracked assignees
USPTO 2015–2025 USPTO PatentsView Foreign Corporation
Eisai R&D Management Co., Ltd.
USPTO PatentsView assignee record — 266 granted patents across 21 technology areas, active 2015–2025. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: A61P (SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS).
266
Total patents granted
21
CPC technology areas
16.3
Avg claims per patent
-3%
5-year filing velocity
Portfolio overview
Eisai R&D Management Co., Ltd. has been granted 266 US utility patents between 2015 and 2025, placing Eisai R&D Management Co., Ltd. at rank #1,558 across all assignees tracked by PlainPatent. This portfolio spans 21 distinct Cooperative Patent Classification (CPC) subclasses, averaging 16.3 claims per patent with primary concentration in A61P (SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS). As a Foreign Corporation, Eisai R&D Management Co., Ltd. is one of the more focused assignees in the PatentsView dataset. The composite Innovation Score of 49.6/100 blends portfolio volume, filing velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.
Filing cadence tells the strategic story. Between 2020 and 2025 the company received 131 grants, compared with 135 in the 2015–2019 window — a -3% shift in five-year velocity. A cooling filing rate may reflect portfolio consolidation, shifting priorities, or reduced R&D throughput. The Foreign Corporation classification further shapes interpretation, since corporate, government, and individual filers pursue patents for materially different reasons.
Claim depth and technology breadth together indicate competitive posture. Eisai R&D Management Co., Ltd.'s 16.3 average claims per patent sits within the typical range for solid legal coverage without excessive prosecution cost, while a multi-domain presence across 21 subclasses balances depth with breadth. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark Eisai R&D Management Co., Ltd. against peers pursuing similar technology classes.
How does Eisai compare?
Granted US patents 2015–2025 versus the largest corporate holders — this company marked ◀
- Samsung
SAMSUNG ELECTRONICS CO., LTD.
106,890 patents
- International Bus…
International Business Machines Corporation
72,926 patents
- Canon 34,378
Canon Kabushiki Kaisha
34,378 patents
- LG 32,607
LG ELECTRONICS INC.
32,607 patents
- Taiwan Semiconduc… 31,041
TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
31,041 patents
- Apple 30,560
Apple Inc.
30,560 patents
- Qualcomm Incorpor… 30,354
QUALCOMM Incorporated
30,354 patents
- Intel 27,498
Intel Corporation
27,498 patents
- Eisai R&D Managem… ◀ 266
Eisai R&D Management Co., Ltd.
266 patents
What this shows Eisai holds 266 patents — placing it at rank #1,558 overall, well behind the volume leaders but ahead of the tens of thousands of smaller assignees in the dataset.
USPTO utility patent grants by year · 2015–2025
Grants by year
Teal-shaded recent years (2020–present) versus the 2015–2019 baseline. Full figures in the table below.
View data table
| Year | Patents Granted | Share of Period |
|---|---|---|
| 2015 | 36 | 13.5% |
| 2016 | 20 | 7.5% |
| 2017 | 23 | 8.6% |
| 2018 | 26 | 9.8% |
| 2019 | 30 | 11.3% |
| 2020 | 28 | 10.5% |
| 2021 | 31 | 11.7% |
| 2022 | 25 | 9.4% |
| 2023 | 21 | 7.9% |
| 2024 | 12 | 4.5% |
| 2025 | 14 | 5.3% |
Which technologies does Eisai R&D Management Co., Ltd. patent most?
Top 15 of 21 technology areas
Patent Moat Analysis
Portfolio Volume Moderate
Tech Breadth Multi-domain
Claim Depth Standard
Velocity Declining
Frequently Asked Questions
How many patents does Eisai R&D Management Co., Ltd. hold?
Eisai R&D Management Co., Ltd. holds 266 US granted patents filed between 2015 and 2025, spanning 21 technology areas.
What is Eisai R&D Management Co., Ltd.'s Innovation Score?
Eisai R&D Management Co., Ltd. has an Innovation Score of 49.6 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).
What technology areas does Eisai R&D Management Co., Ltd. focus on?
Eisai R&D Management Co., Ltd.'s top technology area is A61P (SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS) with 196 patents. The company has filed patents in 21 CPC subclasses total.
Is Eisai R&D Management Co., Ltd.'s patent filing rate increasing or decreasing?
Eisai R&D Management Co., Ltd.'s recent filing velocity is -3% compared to the prior five-year period. Filing activity has slowed relative to earlier years.
What does claim depth mean for Eisai R&D Management Co., Ltd.'s patents?
Eisai R&D Management Co., Ltd.'s patents average 16.3 claims each. This falls within the standard range, providing solid legal coverage.
How is the Eisai R&D Management Co., Ltd. patent data sourced?
All patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office covering US granted utility patents from 2015 to 2025.
Learn More
Explore the patent dataset
A61P technology
Eisai R&D Management Co., Ltd.'s primary CPC class — all holders and yearly trends
Top 50 patent holders
See where Eisai R&D Management Co., Ltd. ranks among the largest US patent assignees
All technology classes
Browse every CPC technology area by patent activity
How the score works
The four dimensions behind the Innovation Score
Related
Data sourced from USPTO PatentsView — official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the USPTO PatentsView database. Consult a qualified professional before making decisions based on this data.
Read our methodology — how this data is sourced, computed, and verified.
All federal data sources used on this page
- USPTO PatentsView — official U.S. Patent and Trademark Office bulk patent data. patentsview.org
- USPTO Patent Application Information Retrieval (PAIR) — application status and file history. uspto.gov/patents/pair
- USPTO Bulk Data Storage System — comprehensive patent text + claims dataset. bulkdata.uspto.gov
- USPTO CPC Classification — Cooperative Patent Classification scheme for technology categorization. uspto.gov/cpc
- SEC EDGAR — public filings cross-reference for assignee corporate entity matching. sec.gov/edgar
- WIPO PATENTSCOPE — international patent context (related international filings). wipo.int/patentscope
