Where does Ker-train Holdings Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Ker-train Holdings Ltd. ranks #48,104 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 Ker-train Holdings Ltd. hold?

Ker-train Holdings Ltd. holds 5 US utility patents granted between 2017 and 2024, spanning 4 technology areas.

What is Ker-train Holdings Ltd.'s Innovation Score?

Ker-train Holdings Ltd. has an Innovation Score of 25.4 out of 100 (17th 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 Ker-train Holdings Ltd. focus on?

Ker-train Holdings Ltd.'s top technology area is F16D (Couplings FOR Transmitting ROTATION; CLUTCHES; Brakes) with 4 patents, ranking #304 of 1,090 assignees active in that subclass. Grants appear in 4 CPC subclasses total.

Is Ker-train Holdings Ltd.'s patent grant rate increasing or decreasing?

Ker-train Holdings Ltd.'s recent grant velocity is +50% compared to the prior five-year period (grant years, not application filing dates). This indicates accelerating grant output.

What does claim depth mean for Ker-train Holdings Ltd.'s patents?

Ker-train Holdings Ltd.'s patents average 14.6 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 Ker-train Holdings 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

Ker-train Holdings Ltd.

USPTO PatentsView assignee record - 5 granted patents across 4 technology areas, recorded in grant years 2017–2024. 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: F16D (Couplings FOR Transmitting ROTATION; CLUTCHES; Brakes).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Ker-train ranks #48,104 of 49,997 tracked US assignees by granted-patent volume, with 5 patents across 4 technology areas.

#48,104
of 49,997 US assignees by volume: 17th percentile
by Innovation Score (25.4/100): 14.6
avg claims per patent: +50%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R48104 · Foreign Corporation #48,104 · 5 grants

GRANTS-MICRO · BOTTOM-DECILE · PHOTO-FINISH · CPC-NARROW · INNOV-THIN · CLAIMS-RICH · TYPE-FRNCORP · VEL-SURGE · BOOK-FULL

GRANTS-MICRO 5 grants
BOTTOM-DECILE #48,104/49,997
PHOTO-FINISH Kemflo (NANJING)…
CPC-NARROW F16D · 4 areas
INNOV-THIN 25.4/100
CLAIMS-RICH 14.6 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-SURGE +50% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Kemflo (NANJING) Environmental Technology Co., Ltd. (±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 Ker-train’s 25.4 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 6.2 pts (24%) Velocity 3.3 pts (13%) Breadth 7.1 pts (28%) Claim depth 8.8 pts (35%)

Qualcomm Incorporated · highest

85
Ker-train Holdings · this assignee

25
3D Lighting… · lowest

7

What this shows Ker-train's Innovation Score is 25.4/100 (17th 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 Ker-train?

Each dot is one of Ker-train’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). Ker-train’s own 14.6 claims/patent is ABOVE the 9.2 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where Ker-train's grants concentrate

Ker-train Holdings Ltd. is a focused PatentsView assignee: 4 CPC subclasses with 80% of grants classified under F16D (Couplings FOR Transmitting ROTATION; CLUTCHES; Brakes). Peak complete grant year is 2020 (2 grants) versus a trough of 1 in 2017. By volume, Ker-train sits between Kemflo (NANJING) Environmental Technology Co., Ltd. and Keygen Data LLC.

Ker-train's three-year grant acceleration

Ker-train Holdings Ltd. shows 1 grants in 2022–2024 against only 2 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.

Kemflo (Nanjing)…

5
Kemijski Institut

5
KEN Sean Industri…

5
Kennedy-wilson

5
Keracel

5
Kern

5
KEY Medical

5
Keygen Data

5
Ker-train Holdings ◀

5

What this shows Ker-train holds 5 patents at rank #48,084, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Ker-train

By rank, the assignees closest to #48,084 in granted patent volume.

Leaders in F16D (Couplings FOR Transmitting Rotation)

Other assignees with the most granted patents in Ker-train's primary technology class.

Ker-train's Innovation Score vs. every tracked assignee

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

25 17th percentile higher than 17% 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 · 2017–2024

Grants by year

Teal-shaded recent years (2020–present) versus the 2017–2019 baseline. Full figures in the table below.

View data table

Ker-train Holdings Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2017	1	20.0%
2018	1	20.0%
2020	2	40.0%
2024	1	20.0%

Which technologies does Ker-train Holdings Ltd. patent most?

F16D - Couplings FOR Transmitting ROTATION; CLUTCHES; Brakes 4

Y10S - Technical Subjects Covered BY Former Uspc Cross-reference ART Collections [XRACs] AND Digests 2

Y10T - Technical Subjects Covered BY Former US Classification 2

B62D - Motor VEHICLES; Trailers 1

Top 4 of 4 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

Ker-train Holdings Ltd.'s patent record in context - here's where to go next.

Ker-train Holdings Ltd.'s lead technology class is F16D (Couplings FOR Transmitting ROTATION; CLUTCHES; Brakes), 80% of its portfolio - see every assignee active in that class. Explore F16D
Ranked #48,104 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Ker-train Holdings Ltd. against Kemflo (NANJING) Environmental Technology Co., Ltd., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 25.4/100 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.