Where does Eisai Inc. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Eisai Inc. ranks #35,137 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 Inc. hold?

Eisai Inc. holds 7 US utility patents granted between 2018 and 2023, spanning 5 technology areas.

What is Eisai Inc.'s Innovation Score?

Eisai Inc. has an Innovation Score of 20.0 out of 100 (6th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Eisai Inc. focus on?

Eisai Inc.'s top technology area is A61P (Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations) with 6 patents, ranking #2,984 of 6,058 assignees active in that subclass. Grants appear in 5 CPC subclasses total.

Is Eisai Inc.'s patent grant rate increasing or decreasing?

Eisai Inc.'s recent grant velocity is -60% 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 Inc.'s patents?

Eisai Inc.'s patents average 6.0 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 Inc. 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 US Corporation

Eisai Inc.

USPTO PatentsView assignee record - 7 granted patents across 5 technology areas, recorded in grant years 2018–2023. 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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Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, Eisai ranks #35,137 of 49,997 tracked US assignees by granted-patent volume, with 7 patents across 5 technology areas.

#35,137
of 49,997 US assignees by volume: 6th percentile
by Innovation Score (20.0/100): 6.0
avg claims per patent: -60%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R35137 · US Corporation #35,137 · 7 grants

GRANTS-MICRO · MID-PACK · PHOTO-FINISH · CPC-NARROW · INNOV-THIN · CLAIMS-SPARSE · TYPE-USCORP · VEL-DROP · BOOK-FULL

GRANTS-MICRO 7 grants
MID-PACK #35,137/49,997
PHOTO-FINISH Ecole Nationale…
CPC-NARROW A61P · 5 areas
INNOV-THIN 20.0/100
CLAIMS-SPARSE 6.0 claims/avg
TYPE-USCORP US Corporation
VEL-DROP -60% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Ecole Nationale Superieure de Chimie (±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.

How Eisai’s 20.0 Innovation Score adds up

The same four weighted components behind every Innovation Score on PlainPatent: portfolio volume, grant velocity, technology breadth, and claim depth.

Volume 7.2 pts (36%) Velocity 1.3 pts (7%) Breadth 7.9 pts (40%) Claim depth 3.6 pts (18%)

Qualcomm Incorporated · highest

85
Eisai · this assignee

20
3D Lighting… · lowest

7

What this shows Eisai's Innovation Score is 20.0/100 (6th percentile 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.

Does more volume mean deeper claims for Eisai?

Each dot is one of Eisai’s 8 nearest volume peers (same corpus rank neighbourhood as the chart above), placed by total granted patents (horizontal) against average claims per patent (vertical). Eisai’s own 6.0 claims/patent is at or below the 16.0 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

Eisai vs its 8 nearest volume peers: granted patents vs average claims per patent. Source: USPTO PatentsView.

Where Eisai's grants concentrate

Eisai Inc. is a focused PatentsView assignee: 5 CPC subclasses with 85.7% of grants classified under A61P (Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations). Peak complete grant year is 2019 (4 grants) versus a trough of 1 in 2018. By volume, Eisai sits between Ecole Nationale Superieure de Chimie and Electra Polymer Ltd..

Eisai's three-year grant acceleration

Eisai Inc. shows 1 grants in 2022–2024 against only 5 in 2019–2021. That prior window is too thin for a growth multiple (rename and spin-out assignees look artificially high when the baseline is near zero), so PlainPatent withholds a ranked acceleration claim here.

Ecole Nationale S…

7
Ecube Labs

7
Eddie's Social Cl…

7
Eggers & Associat…

7
Elanco Animal Hea…

7
Eldon Technology

7
Electdis AB

7
Electra Polymer

7
Eisai ◀

7

What this shows Eisai holds 7 patents at rank #35,196, 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 #35,196 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.

Eisai's Innovation Score vs. every tracked assignee

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

20 6th percentile higher than 6% 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 · 2018–2023

Grants by year

Teal-shaded recent years (2020–present) versus the 2018–2019 baseline. Full figures in the table below.

View data table

Eisai Inc. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2018	1	14.3%
2019	4	57.1%
2020	1	14.3%
2023	1	14.3%

Which technologies does Eisai Inc. patent most?

A61P - Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations 6

C07K - Peptides 6

A61K - Preparations FOR Medical, Dental OR Toiletry Purposes 6

G01N - Investigating OR Analysing Materials BY Determining Their Chemical OR Physical Properties 3

B82Y - Specific Uses OR Applications OF NANOSTRUCTURES; Measurement OR Analysis OF NANOSTRUCTURES; Manufacture OR Treatment OF Nanostructures 1

Top 5 of 5 technology areas

More on this record

Data Source

USPTO PatentsView, US granted patents 2015–2025

View all rankings → How is Innovation Score calculated?

What to do with this data

Eisai Inc.'s patent record in context - here's where to go next.

Eisai Inc.'s lead technology class is A61P (Specific Therapeutic Activity OF Chemical Compounds OR Medicinal Preparations), 85.7% of its portfolio - see every assignee active in that class. Explore A61P
Ranked #35,137 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Eisai Inc. against Ecole Nationale Superieure de Chimie, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 20.0/100 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.