Where does National Steel Car Limited rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), National Steel Car Limited ranks #8,450 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 National Steel Car Limited hold?

National Steel Car Limited holds 38 US utility patents granted between 2015 and 2025, spanning 11 technology areas.

What is National Steel Car Limited's Innovation Score?

National Steel Car Limited has an Innovation Score of 45.4 out of 100 (top 23% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does National Steel Car Limited focus on?

National Steel Car Limited's top technology area is B61D (Body Details OR Kinds OF Railway Vehicles) with 30 patents, ranking #5 of 155 assignees active in that subclass. Grants appear in 11 CPC subclasses total.

Is National Steel Car Limited's patent grant rate increasing or decreasing?

National Steel Car Limited's recent grant velocity is -36% 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 National Steel Car Limited's patents?

National Steel Car Limited's patents average 26.3 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 National Steel Car Limited 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

National Steel Car Limited

USPTO PatentsView assignee record - 38 granted patents across 11 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: B61D (Body Details OR Kinds OF Railway Vehicles).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, National ranks #8,450 of 49,997 tracked US assignees by granted-patent volume, with 38 patents across 11 technology areas.

#8,450
of 49,997 US assignees by volume: Top 23%
by Innovation Score (45.4/100): 26.3
avg claims per patent: -36%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R8450 · Foreign Corporation #8,450 · 38 grants

GRANTS-SMALL · UPPER-Q · PHOTO-FINISH · CPC-FOCUS · INNOV-PAR · CLAIMS-DENSE · TYPE-FRNCORP · VEL-DOWN · BOOK-FULL

GRANTS-SMALL 38 grants
UPPER-Q #8,450/49,997
PHOTO-FINISH National Center OF…
CPC-FOCUS B61D · 11 areas
INNOV-PAR 45.4/100
CLAIMS-DENSE 26.3 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DOWN -36% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: National Center OF Neurology AND Psychiatry (±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 National’s 45.4 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 12.7 pts (28%) Velocity 6.0 pts (13%) Breadth 11.7 pts (26%) Claim depth 15.0 pts (33%)

Qualcomm Incorporated · highest

85
Blackmore Sensors &… · near

45
Gmems Tech Shenzhen · near

45
Microban Products · near

45
Mueller Martini… · near

45
National Steel Car · this assignee

45
3D Lighting… · lowest

7

What this shows National's Innovation Score is 45.4/100 (top 23% 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 National?

Each dot is one of National’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). National’s own 26.3 claims/patent is ABOVE the 9.9 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where National's grants concentrate

National Steel Car Limited is a focused PatentsView assignee: 11 CPC subclasses with 78.9% of grants classified under B61D (Body Details OR Kinds OF Railway Vehicles). Peak complete grant year is 2015 (7 grants) versus a trough of 1 in 2018. By volume, National sits between National Center OF Neurology AND Psychiatry and OsteoMed LLC.

National's three-year grant acceleration

National Steel Car Limited shows 9 grants in 2022–2024 against only 10 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.

National Center O…

38
Nidec Copal

38
Nippon Chemiphar

38
National Chain

38
Novimmune

38
Ormat

38
Otos Wing

38
Osteomed

38
National Steel Car ◀

38

What this shows National holds 38 patents at rank #8,452, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near National

By rank, the assignees closest to #8,452 in granted patent volume.

Leaders in B61D (Body Details OR Kinds OF Railway Vehicles)

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

Assignees with similar portfolio profiles

Two PlainPatent-derived peer sets for National, neither rank-band nor same-CPC leaders (those blocks stay above). In B61D (Body Details OR Kinds OF Railway Vehicles), National ranks #5 of 155 assignees by patent count in that subclass.

Similar innovation score

Nearest assignees by Innovation Score (45 here).

Blackmore Sensors & Analytics, LLC. 45 Microban Products Company 45 Mueller Martini Holding AG 45 Gmems Tech Shenzhen Limited 45

National's Innovation Score vs. every tracked assignee

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

45 Top 23% higher than 77% 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

National Steel Car Limited patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	7	18.4%
2016	6	15.8%
2017	3	7.9%
2018	1	2.6%
2019	5	13.2%
2020	4	10.5%
2021	1	2.6%
2022	2	5.3%
2023	4	10.5%
2024	3	7.9%
2025partial year	2	5.3%

Which technologies does National Steel Car Limited patent most?

B61D - Body Details OR Kinds OF Railway Vehicles 30

B61F - Rail Vehicle Suspensions, e.g. Underframes, Bogies OR Arrangements OF Wheel AXLES; Rail Vehicles FOR USE ON Tracks OF Different WIDTH; Preventing Derailing OF Rail VEHICLES; Wheel Guards, Obstruction Removers OR THE Like FOR Rail Vehicles 15

Y02T - Climate Change Mitigation Technologies Related TO Transportation 3

E06C - Ladders 2

B61G - COUPLINGS; Draught AND Buffing Appliances 1

B60P - Vehicles Adapted FOR Load Transportation OR TO Transport, TO Carry, OR TO Comprise Special Loads OR Objects 1

Y10T - Technical Subjects Covered BY Former US Classification 1

E05Y - Indexing Scheme Associated With Subclasses E05d AND E05f, Relating TO Construction Elements, Electric Control, Power Supply, Power Signal OR Transmission, User Interfaces, Mounting OR Coupling, Details, Accessories, Auxiliary Operations NOT Otherwise Provided FOR, Application Thereof 1

E05F - Devices FOR Moving Wings Into Open OR Closed POSITION; Checks FOR WINGS; Wing Fittings NOT Otherwise Provided FOR, Concerned With THE Functioning OF THE Wing 1

B61H - Brakes OR Other Retarding Devices Specially Adapted FOR Rail VEHICLES; Arrangement OR Disposition Thereof IN Rail Vehicles 1

B60T - Vehicle Brake Control Systems OR Parts THEREOF; Brake Control Systems OR Parts Thereof, IN General ; Arrangement OF Braking Elements ON Vehicles IN GENERAL; Portable Devices FOR Preventing Unwanted Movement OF VEHICLES; Vehicle Modifications TO Facilitate Cooling OF Brakes 1

Top 11 of 11 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

National Steel Car Limited's patent record in context - here's where to go next.

National Steel Car Limited's lead technology class is B61D (Body Details OR Kinds OF Railway Vehicles), 78.9% of its portfolio - see every assignee active in that class. Explore B61D
Ranked #8,450 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare National Steel Car Limited against National Center OF Neurology AND Psychiatry, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 45.4/100 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.