Where does Tokai Carbon Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Tokai Carbon Co., Ltd. ranks #18,199 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 Tokai Carbon Co., Ltd. hold?

Tokai Carbon Co., Ltd. holds 16 US utility patents granted between 2015 and 2025, spanning 27 technology areas.

What is Tokai Carbon Co., Ltd.'s Innovation Score?

Tokai Carbon Co., Ltd. has an Innovation Score of 42.3 out of 100 (top 31% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Tokai Carbon Co., Ltd. focus on?

Tokai Carbon Co., Ltd.'s top technology area is C01P (Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds) with 11 patents, ranking #107 of 939 assignees active in that subclass. Grants appear in 27 CPC subclasses total.

Is Tokai Carbon Co., Ltd.'s patent grant rate increasing or decreasing?

Tokai Carbon Co., Ltd.'s recent grant velocity is -33% 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 Tokai Carbon Co., Ltd.'s patents?

Tokai Carbon Co., Ltd.'s patents average 8.7 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 Tokai Carbon 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

Tokai Carbon Co., Ltd.

USPTO PatentsView assignee record - 16 granted patents across 27 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: C01P (Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Tokai ranks #18,199 of 49,997 tracked US assignees by granted-patent volume, with 16 patents across 27 technology areas.

#18,199
of 49,997 US assignees by volume: Top 31%
by Innovation Score (42.3/100): 8.7
avg claims per patent: -33%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R18199 · Foreign Corporation #18,199 · 16 grants

GRANTS-MICRO · MID-PACK · PHOTO-FINISH · CPC-FOCUS · INNOV-PAR · CLAIMS-PAR · TYPE-FRNCORP · VEL-DOWN · BOOK-FULL

GRANTS-MICRO 16 grants
MID-PACK #18,199/49,997
PHOTO-FINISH Thousandeyes
CPC-FOCUS C01P · 27 areas
INNOV-PAR 42.3/100
CLAIMS-PAR 8.7 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DOWN -33% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Thousandeyes LLC (±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 Tokai’s 42.3 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 9.8 pts (23%) Velocity 8.9 pts (21%) Breadth 18.4 pts (43%) Claim depth 5.2 pts (12%)

Qualcomm Incorporated · highest

85
Tokai Carbon · this assignee

42
3D Lighting… · lowest

7

What this shows Tokai's Innovation Score is 42.3/100 (top 31% 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 Tokai?

Each dot is one of Tokai’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). Tokai’s own 8.7 claims/patent is at or below the 10.6 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

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

Where Tokai's grants concentrate

Tokai Carbon Co., Ltd. is a focused PatentsView assignee: 27 CPC subclasses with 68.8% of grants classified under C01P (Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds). Peak complete grant year is 2015 (5 grants) versus a trough of 1 in 2016. By volume, Tokai sits between Thousandeyes LLC and Topray Mems Inc..

Tokai's three-year grant acceleration

Tokai Carbon Co., Ltd. shows 4 grants in 2022–2024 against only 3 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.

Thousandeyes

16
Tiax

16
TLS

16
TM4

16
Tokyo Cosmos Elec…

16
Tokyo Marui

16
Toolgen Incorpora…

16
Topray Mems

16
Tokai Carbon ◀

16

What this shows Tokai holds 16 patents at rank #18,177, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Tokai

By rank, the assignees closest to #18,177 in granted patent volume.

Leaders in C01P (Indexing Scheme Relating TO Structural AND Physical Aspec…)

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

Tokai's Innovation Score vs. every tracked assignee

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

42 Top 31% higher than 69% 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

Tokai Carbon Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	5	31.3%
2016	1	6.3%
2018	2	12.5%
2019	1	6.3%
2021	2	12.5%
2023	2	12.5%
2024	2	12.5%
2025partial year	1	6.3%

Which technologies does Tokai Carbon Co., Ltd. patent most?

C01P - Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds 11

C09C - Treatment OF Inorganic Materials, Other Than Fibrous Fillers, TO Enhance Their Pigmenting OR Filling Properties ; Preparation OF Carbon Black ; ; Preparation OF Inorganic Materials Which ARE NO Single Chemical Compounds AND Which ARE Mainly Used AS Pigments OR Fillers 9

C08K - Use of inorganic or non-macromolecular organic substances as compounding ingredients 7

C09D - Coating Compositions, e.g. Paints, Varnishes OR LACQUERS; Filling PASTES; Chemical Paint OR INK REMOVERS; INKS; Correcting FLUIDS; WOODSTAINS; Pastes OR Solids FOR Colouring OR PRINTING; USE OF Materials Therefor 4

C01B - Non-metallic ELEMENTS; Compounds THEREOF; ; Metalloids OR Compounds Thereof NOT Covered BY Subclass C01c 4

H01L - Semiconductor Devices NOT Covered BY Class H10 3

C08G - Macromolecular Compounds Obtained Otherwise Than BY Reactions Only Involving Unsaturated Carbon-to-carbon Bonds 3

C04B - Lime, MAGNESIA; SLAG; CEMENTS; Compositions Thereof, e.g. Mortars, Concrete OR Like Building MATERIALS; Artificial Stone ; Ceramics ; REFRACTORIES; Treatment OF Natural Stone 3

B60C - Vehicle TYRES; Tyre INFLATION; Tyre CHANGING; Connecting Valves TO Inflatable Elastic Bodies IN GENERAL; Devices OR Arrangements Related TO Tyres 2

B82Y - Specific Uses OR Applications OF NANOSTRUCTURES; Measurement OR Analysis OF NANOSTRUCTURES; Manufacture OR Treatment OF Nanostructures 2

H01M - Processes OR Means, e.g. Batteries, FOR THE Direct Conversion OF Chemical Energy Into Electrical Energy 2

Y02E - Reduction OF Greenhouse GAS [GHG] Emissions, Related TO Energy Generation, Transmission OR Distribution 2

C23C - Coating Metallic MATERIAL; Coating Material With Metallic MATERIAL; Surface Treatment OF Metallic Material BY Diffusion Into THE Surface, BY Chemical Conversion OR SUBSTITUTION; Coating BY Vacuum Evaporation, BY Sputtering, BY ION Implantation OR BY Chemical Vapour Deposition, IN General 2

C30B - Single-crystal Growth ; Unidirectional Solidification OF Eutectic Material OR Unidirectional Demixing OF Eutectoid MATERIAL; Refining BY Zone-melting OF Material ; Production OF A Homogeneous Polycrystalline Material With Defined Structure ; Single Crystals OR Homogeneous Polycrystalline Material WI 2

C08L - Compositions OF Macromolecular Compounds 2

Top 15 of 27 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

Tokai Carbon Co., Ltd.'s patent record in context - here's where to go next.

Tokai Carbon Co., Ltd.'s lead technology class is C01P (Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds), 68.8% of its portfolio - see every assignee active in that class. Explore C01P
Ranked #18,199 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Tokai Carbon Co., Ltd. against Thousandeyes LLC, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 42.3/100 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.