PlainPatent
USPTO 2015–2025 USPTO PatentsView Foreign Corporation

China Steel Corporation

USPTO PatentsView assignee record - 5 granted patents across 10 technology areas, active 2015–2018. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: C21D (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING).

Explore the portfolio See the ranking
5
Total patents granted
10
CPC technology areas
7.8
Avg claims per patent
-100%
5-year filing velocity

The verdict

China holds 5 US patents across 10 technology areas, rank #45,531 of 50,000 tracked assignees.

#45,531
of 50,000 US assignees by volume
Top 90%
by Innovation Score (22.1/100)
7.8
avg claims per patent
-100%
filing velocity, last 5 yrs

Portfolio overview

China Steel Corporation has been granted 5 US utility patents between 2015 and 2018, placing China Steel Corporation at rank #45,531 across all assignees tracked by PlainPatent. This portfolio spans 10 distinct Cooperative Patent Classification (CPC) subclasses, averaging 7.8 claims per patent with primary concentration in C21D (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING). As a Foreign Corporation, China Steel Corporation is one of the more focused assignees in the PatentsView dataset. By volume, China sits between Child MIND Institute, Inc. (5 patents, rank #45,527) and Chint LOW Voltage Electrical Technology Co., Ltd. (5 patents, rank #45,535) - the closest US assignees by grant volume. The composite Innovation Score of 22.1/100 blends portfolio volume, filing velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.

Filing cadence tells the strategic story. Between 2020 and 2025 the company received 0 grants, compared with 5 in the 2015–2019 window, a -100% shift in five-year velocity. A cooling filing rate may reflect portfolio consolidation, shifting priorities, or reduced R&D throughput. The Foreign Corporation classification further shapes interpretation, since corporate, government, and individual filers pursue patents for materially different reasons.

Claim depth and technology breadth together indicate competitive posture. China Steel Corporation's 7.8 average claims per patent suggests focused, narrowly drawn claims typical of single-invention filings, while concentration in 10 subclasses points to a focused technical program. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark China Steel Corporation against peers pursuing similar technology classes.

Who files at China's volume?

Granted US patents 2015–2025 versus its nearest-ranked assignees by volume, this company marked ◀

patents

What this shows China holds 5 patents at rank #45,531, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Source USPTO PatentsView, granted utility patents As of 2015–2025

Companies ranked near China

By rank, the assignees closest to #45,531 in granted patent volume.

Leaders in C21D (Modifying THE Physical Structure OF Ferrous Metals)

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, filing velocity, technology breadth, and claim depth (0–100)

22 Top 90% higher than 10% of 50,000 US assignees

0–10: 687 US assignees (1%). Below this entry. 10–20: 2,527 US assignees (5%). Below this entry. 20–30: 13,162 US assignees (26%). This entry sits in this band. 30–40: 15,294 US assignees (31%). Above this entry. 40–50: 11,491 US assignees (23%). Above this entry. 50–60: 5,058 US assignees (10%). Above this entry. 60–70: 1,537 US assignees (3%). Above this entry. 70–80: 234 US assignees (0%). Above this entry. 80–90: 10 US assignees (0%). Above this entry. 90–100: 0 US assignees (0%). Above this entry. This assignee 0 100 every tracked assignee, bucketed by value

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

0.511.522.533.5 201520162018 1
USPTO utility patent grants by year · 2015–2018

Grants by year

Teal-shaded recent years (2020–present) versus the 2015–2019 baseline. Full figures in the table below.

View data table
China Steel Corporation patent grants by year, 2015–2025
Year Patents Granted Share of Period
2015 3 60.0%
2016 1 20.0%
2018 1 20.0%

Which technologies does China Steel Corporation patent most?

Top 10 of 10 technology areas

Patent Moat Analysis

Portfolio Volume Light
Tech Breadth Focused
Claim Depth Simple
Velocity Declining

Where it ranks

Overall rank by patents

#45,531

Across all tracked assignees

Innovation Score

22.1 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

Frequently Asked Questions

How many patents does China Steel Corporation hold?
China Steel Corporation holds 5 US granted patents filed between 2015 and 2018, spanning 10 technology areas.
What is China Steel Corporation's Innovation Score?
China Steel Corporation has an Innovation Score of 22.1 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).
What technology areas does China Steel Corporation focus on?
China Steel Corporation's top technology area is C21D (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING) with 2 patents. The company has filed patents in 10 CPC subclasses total.
Is China Steel Corporation's patent filing rate increasing or decreasing?
China Steel Corporation's recent filing velocity is -100% compared to the prior five-year period. Filing activity has slowed relative to earlier years.
What does claim depth mean for China Steel Corporation's patents?
China Steel Corporation's patents average 7.8 claims each. This is relatively simple claim structure, typical for focused inventions.
How is the China Steel Corporation 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.

How to use this portfolio

China's 5 grants land it in the top 90% by Innovation Score, but volume alone doesn't tell you where the strength sits.

  • Read that count against the largest US assignees before treating it as dominance - China ranks #45,531 of 50,000. Top 50 holders
  • Most of this portfolio concentrates in C21D - see who else leads that technology area. C21D leaders
  • Check what the four-part Innovation Score actually rewards before comparing it to another company. How the score works

Patent counts and the Innovation Score measure patenting activity, not commercial success or the legal strength of any patent. Many patents are filed defensively. Verify the status of an individual patent against official USPTO records.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

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

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.