Where does Eisai R&D Management Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Eisai R&D Management Co., Ltd. ranks #1,558 of 49,997 assignees by granted-patent volume, the same sort as the companies listing and top-holders ranking. See /methodology/#corpus-placement.

How many patents does Eisai R&D Management Co., Ltd. hold?

Eisai R&D Management Co., Ltd. holds 266 US utility patents granted 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 (top 14% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Eisai R&D Management Co., Ltd.'s patent grant rate increasing or decreasing?

Eisai R&D Management Co., Ltd.'s recent grant velocity is -13% compared to the prior five-year period (grant years, not application filing dates). Grant 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 is an aggregate descriptive count from the grant record; it does not establish claim scope, legal strength, enforceability, or design-around risk.

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.

USPTO 2015–2025 USPTO PatentsView Foreign Corporation

Eisai R&D Management Co., Ltd.

Q: 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. Grants appear in 21 CPC subclasses total.

USPTO PatentsView assignee record - 266 granted patents across 21 technology areas, recorded in grant years 2015–2025. Grant-trend analysis is cross-referenced to USPTO Patent Public Search; it does not measure application filings, current R&D, or legal strength. Primary class: A61P (Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Eisai ranks #1,558 of 49,997 tracked US assignees by granted-patent volume, with 266 patents across 21 technology areas.

#1,558
of 49,997 US assignees by volume: Top 14%
by Innovation Score (49.6/100): 16.3
avg claims per patent: -13%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R1558 · Foreign Corporation #1,558 · 266 grants

GRANTS-MID · TOP-DECILE · PHOTO-FINISH · CPC-FOCUS · INNOV-PAR · CLAIMS-RICH · TYPE-FRNCORP · VEL-DOWN · BOOK-FULL

GRANTS-MID 266 grants
TOP-DECILE #1,558/49,997
PHOTO-FINISH Biotronik SE & KG
CPC-FOCUS A61P · 21 areas
INNOV-PAR 49.6/100
CLAIMS-RICH 16.3 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DOWN -13% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Biotronik SE & Co. KG (±0 grants)

Instrument codes from this assignee’s USPTO PatentsView grant sheet: volume band, corpus rank, photo-finish peer, lead CPC, Innovation Score, claim depth, assignee type, velocity, and book completeness. Not a USPTO rating of patent strength.

Qualcomm Incorporated · highest

85
Cohesity · near

50
Eisai R&D Management · this assignee

50
Fleetwood Group · near

50
People Center · near

50
Telenav · near

50
3D Lighting… · lowest

7

What this shows Eisai's Innovation Score is 49.6/100 (top 14% of the PatentsView-derived corpus). The chart places that score against the nearest Innovation Score peers plus corpus poles, not a reprint of the volume ranking.

Where Eisai's grants concentrate

Eisai R&D Management Co., Ltd. is a focused PatentsView assignee: 21 CPC subclasses with 73.7% of grants classified under A61P (Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations). Peak complete grant year is 2015 (36 grants) versus a trough of 12 in 2024. By volume, Eisai sits between Ignis Innovation Inc. and Thule Sweden AB.

Eisai's three-year grant acceleration

From 2019–2021 to 2022–2024, Eisai R&D Management Co., Ltd. moved from 89 to 58 grants (0.65x the prior three-year total, a multiple, not a CAGR). Among 3,296 tracked assignees with ≥100 grants and ≥20 prior-period grants, that multiple ranks #2,303. See the growth leaderboard.

Ignis Innovation

267
S-printing Soluti…

267
Ushio Denki

267
Biotronik SE & KG

266
Kyungpook Nationa…

266
Sumitomo Electric…

266
Tenneco Automotiv…

266
Thule Sweden AB

266
Eisai R&D Managem… ◀

266

What this shows Eisai holds 266 patents at rank #1,558, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Eisai

By rank, the assignees closest to #1,558 in granted patent volume.

Leaders in A61P (Specific Therapeutic Activity OF Chemical Compounds OR Me…)

Other assignees with the most granted patents in Eisai's primary technology class.

Assignees with similar portfolio profiles

Two PlainPatent-derived peer sets for Eisai, neither rank-band nor same-CPC leaders (those blocks stay above).

Similar innovation score

Nearest assignees by Innovation Score (50 here).

Cohesity, Inc. 50 Telenav, Inc. 50 People Center, Inc. 50 Fleetwood Group, Inc. 50

Similar claim depth

Nearest assignees by average claims per patent (16.3 here).

Institut Pasteur 16.3 avg Huf Hülsbeck & Fürst GmbH & Co. KG 16.3 avg Baylor College of Medicine 16.3 avg Insulet Corporation 16.3 avg

Eisai's Innovation Score vs. every tracked assignee

Composite of portfolio volume, grant velocity, technology breadth, and claim depth (0–100)

50 Top 14% higher than 86% of 49,997 US assignees

Each bar is a band; taller bars hold more US assignees. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source USPTO PatentsView, PlainPatent Innovation Score · 2015–2025

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

Eisai R&D Management Co., Ltd. patent grants by year, 2015–2025
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%
2025partial year	14	5.3%

Which technologies does Eisai R&D Management Co., Ltd. patent most?

A61P - Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations 196

A61K - Preparations FOR Medical, Dental OR Toiletry Purposes 150

C07D - Heterocyclic Compounds 131

C07K - Peptides 51

G01N - Investigating OR Analysing Materials BY Determining Their Chemical OR Physical Properties 31

C07F - Acyclic, Carbocyclic OR Heterocyclic Compounds Containing Elements Other Than Carbon, Hydrogen, Halogen, Oxygen, Nitrogen, Sulfur, Selenium OR Tellurium 25

C12N - Microorganisms OR ENZYMES; Compositions THEREOF; Propagating, Preserving, OR Maintaining MICROORGANISMS; Mutation OR Genetic ENGINEERING; Culture Media 22

C07B - General Methods OF Organic CHEMISTRY; Apparatus Therefor 22

Y02P - Climate Change Mitigation Technologies IN THE Production OR Processing OF Goods 19

C12Q - Measuring OR Testing Processes Involving Enzymes, Nucleic Acids OR Microorganisms ; Compositions OR Test Papers THEREFOR; Processes OF Preparing Such COMPOSITIONS; Condition-responsive Control IN Microbiological OR Enzymological Processes 14

C07C - Acyclic OR Carbocyclic Compounds 12

C07H - SUGARS; Derivatives THEREOF; NUCLEOSIDES; NUCLEOTIDES; Nucleic Acids 9

Y02A - Technologies FOR Adaptation TO Climate Change 8

C12P - Fermentation OR Enzyme-using Processes TO Synthesise A Desired Chemical Compound OR Composition OR TO Separate Optical Isomers From A Racemic Mixture 6

C12Y - Enzymes 5

Top 15 of 21 technology areas

Where it ranks

Overall rank by patents

#1,558

of 49,997 tracked assignees

Innovation Score

49.6 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

What to do with this data

Eisai R&D Management Co., Ltd.'s patent record in context - here's where to go next.

Eisai R&D Management Co., Ltd.'s lead technology class is A61P (Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations), 73.7% of its portfolio - see every assignee active in that class. Explore A61P
Ranked #1,558 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Eisai R&D Management Co., Ltd. against Ignis Innovation Inc., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 49.6/100 blends volume, velocity, technology breadth, and claim depth. How it's calculated

Figures reflect USPTO PatentsView grant data through May 2026; pending applications not yet granted are not counted.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent

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.

Data sources used on this page

USPTO PatentsView - the disambiguated bulk patent-grant, assignee, and CPC data this page's figures are derived from. patentsview.org
Cooperative Patent Classification (CPC) - the joint USPTO/EPO classification scheme used to group patents by technology area. cooperativepatentclassification.org
USPTO Patent Public Search - the official interface to verify the status of any individual patent. ppubs.uspto.gov

Compiled by PlainPatent, US Patent Intelligence Editorial Process · May 15, 2026

Every figure on PlainPatent is rendered directly from USPTO source data, no number is typed in by an editor. This page draws directly on USPTO source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.