Where does China Railway Tunnel Group Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), China Railway Tunnel Group Co., Ltd. ranks #39,442 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 China Railway Tunnel Group Co., Ltd. hold?

China Railway Tunnel Group Co., Ltd. holds 6 US utility patents granted between 2021 and 2025, spanning 7 technology areas.

What is China Railway Tunnel Group Co., Ltd.'s Innovation Score?

China Railway Tunnel Group Co., Ltd. has an Innovation Score of 40.9 out of 100 (top 34% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does China Railway Tunnel Group Co., Ltd. focus on?

China Railway Tunnel Group Co., Ltd.'s top technology area is E21D (SHAFTS; TUNNELS; GALLERIES; Large Underground Chambers) with 4 patents, ranking #32 of 112 assignees active in that subclass. Grants appear in 7 CPC subclasses total.

Is China Railway Tunnel Group Co., Ltd.'s patent grant rate increasing or decreasing?

Insufficient historical data is available to calculate a velocity trend for China Railway Tunnel Group Co., Ltd..

What does claim depth mean for China Railway Tunnel Group Co., Ltd.'s patents?

China Railway Tunnel Group Co., Ltd.'s patents average 8.0 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 China Railway Tunnel Group 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

China Railway Tunnel Group Co., Ltd.

USPTO PatentsView assignee record - 6 granted patents across 7 technology areas, recorded in grant years 2021–2025. 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: E21D (SHAFTS; TUNNELS; GALLERIES; Large Underground Chambers).

Compiled by PlainPatent · May 15, 2026

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Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, China ranks #39,442 of 49,997 tracked US assignees by granted-patent volume, with 6 patents across 7 technology areas.

#39,442
of 49,997 US assignees by volume: Top 34%
by Innovation Score (40.9/100): 8.0
avg claims per patent

USPTO PatentsView assignee plate

Corpus R39442 · Foreign Corporation #39,442 · 6 grants

GRANTS-MICRO · LOWER-Q · PHOTO-FINISH · CPC-NARROW · INNOV-PAR · CLAIMS-PAR · TYPE-FRNCORP · SPAN-YRS · BOOK-RICH

GRANTS-MICRO 6 grants
LOWER-Q #39,442/49,997
PHOTO-FINISH China Academy OF…
CPC-NARROW E21D · 7 areas
INNOV-PAR 40.9/100
CLAIMS-PAR 8.0 claims/avg
TYPE-FRNCORP Foreign Corp
SPAN-YRS 2021–2025 · 5y
BOOK-RICH 9/10 fields

Nearest grant-volume peer: China Academy OF Aerospace Aerodynamics (±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 China’s 40.9 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 6.7 pts (16%) Velocity 20.0 pts (49%) Breadth 9.4 pts (23%) Claim depth 4.8 pts (12%)

Qualcomm Incorporated · highest

85
China Railway… · this assignee

41
3D Lighting… · lowest

7

What this shows China's Innovation Score is 40.9/100 (top 34% 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 China?

Each dot is one of China’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). China’s own 8.0 claims/patent is at or below the 14.2 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

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

Where China's grants concentrate

China Railway Tunnel Group Co., Ltd. is a focused PatentsView assignee: 7 CPC subclasses with 66.7% of grants classified under E21D (SHAFTS; TUNNELS; GALLERIES; Large Underground Chambers). Peak complete grant year is 2022 (2 grants) versus a trough of 1 in 2021. By volume, China sits between China Academy OF Aerospace Aerodynamics and CHU Sainte-justine.

China's three-year grant acceleration

China Railway Tunnel Group Co., Ltd. shows 4 grants in 2022–2024 against only 1 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.

China Academy OF…

6
China Automotive…

6
China National Di…

6
China Railway NO…

6
China Three Gorge…

6
China Tobacco Hub…

6
China United Netw…

6
CHU Sainte-justine

6
China Railway Tun… ◀

6

What this shows China holds 6 patents at rank #39,369, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near China

By rank, the assignees closest to #39,369 in granted patent volume.

Leaders in E21D (Shafts)

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

China's Innovation Score vs. every tracked assignee

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

41 Top 34% higher than 66% 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 · 2021–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2021–2019 baseline. Full figures in the table below.

View data table

China Railway Tunnel Group Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2021	1	16.7%
2022	2	33.3%
2024	2	33.3%
2025partial year	1	16.7%

Which technologies does China Railway Tunnel Group Co., Ltd. patent most?

E21D - SHAFTS; TUNNELS; GALLERIES; Large Underground Chambers 4

B07B - Separating Solids From Solids BY Sieving, Screening, Sifting OR BY Using GAS CURRENTS; Separating BY Other DRY Methods Applicable TO Bulk Material, e.g. Loose Articles FIT TO BE Handled Like Bulk Material 1

G01M - Testing Static OR Dynamic Balance OF Machines OR STRUCTURES; Testing OF Structures OR Apparatus, NOT Otherwise Provided FOR 1

E21C - Mining OR Quarrying 1

F16L - PIPES; Joints OR Fittings FOR PIPES; Supports FOR Pipes, Cables OR Protective TUBING; Means FOR Thermal Insulation IN General 1

E02D - FOUNDATIONS; EXCAVATIONS; Embankments ; Underground OR Underwater Structures 1

G09B - Educational OR Demonstration APPLIANCES; Appliances FOR Teaching, OR Communicating With, THE Blind, Deaf OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; Diagrams 1

Top 7 of 7 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

China Railway Tunnel Group Co., Ltd.'s patent record in context - here's where to go next.

China Railway Tunnel Group Co., Ltd.'s lead technology class is E21D (SHAFTS; TUNNELS; GALLERIES; Large Underground Chambers), 66.7% of its portfolio - see every assignee active in that class. Explore E21D
Ranked #39,442 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare China Railway Tunnel Group Co., Ltd. against China Academy OF Aerospace Aerodynamics, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 40.9/100 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.