PlainPatent
USPTO 2015–2025 USPTO PatentsView Foreign Corporation

Kojundo Chemical Laboratory Co., Ltd.

USPTO PatentsView assignee record - 6 granted patents across 7 technology areas, active 2020–2025. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: 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 EVAP).

Explore the portfolio See the ranking
6
Total patents granted
7
CPC technology areas
5.2
Avg claims per patent
-
5-year filing velocity

The verdict

Kojundo holds 6 US patents across 7 technology areas, rank #41,195 of 50,000 tracked assignees.

#41,195
of 50,000 US assignees by volume
Top 39%
by Innovation Score (39.2/100)
5.2
avg claims per patent

Portfolio overview

Kojundo Chemical Laboratory Co., Ltd. has been granted 6 US utility patents between 2020 and 2025, placing Kojundo Chemical Laboratory Co., Ltd. at rank #41,195 across all assignees tracked by PlainPatent. This portfolio spans 7 distinct Cooperative Patent Classification (CPC) subclasses, averaging 5.2 claims per patent with primary concentration in 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 EVAP). As a Foreign Corporation, Kojundo Chemical Laboratory Co., Ltd. is one of the more focused assignees in the PatentsView dataset. By volume, Kojundo sits between Knorr-bremse Commercial Vehicle Systems Japan Ltd. (6 patents, rank #41,191) and Kolon LIFE Science, Inc. (6 patents, rank #41,199) - the closest US assignees by grant volume. The composite Innovation Score of 39.2/100 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. Historical data spans 2020 through 2025, with 6 total grants over that period. Velocity comparisons require five years of historical filings to calibrate. 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. Kojundo Chemical Laboratory Co., Ltd.'s 5.2 average claims per patent suggests focused, narrowly drawn claims typical of single-invention filings, while concentration in 7 subclasses points to a focused technical program. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark Kojundo Chemical Laboratory Co., Ltd. against peers pursuing similar technology classes.

Who files at Kojundo's volume?

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

patents

What this shows Kojundo holds 6 patents at rank #41,195, 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 Kojundo

By rank, the assignees closest to #41,195 in granted patent volume.

Leaders in C23C (Coating Metallic Material)

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

Kojundo's Innovation Score vs. every tracked assignee

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

39 Top 39% higher than 61% 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%). Below this entry. 30–40: 15,294 US assignees (31%). This entry sits in this band. 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

012345 202020232025 1
USPTO utility patent grants by year · 2020–2025

Grants by year

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

View data table
Kojundo Chemical Laboratory Co., Ltd. patent grants by year, 2015–2025
Year Patents Granted Share of Period
2020 1 16.7%
2023 4 66.7%
2025 1 16.7%

Which technologies does Kojundo Chemical Laboratory Co., Ltd. patent most?

Top 7 of 7 technology areas

Patent Moat Analysis

Portfolio Volume Light
Tech Breadth Focused
Claim Depth Simple

Where it ranks

Overall rank by patents

#41,195

Across all tracked assignees

Innovation Score

39.2 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 Kojundo Chemical Laboratory Co., Ltd. hold?
Kojundo Chemical Laboratory Co., Ltd. holds 6 US granted patents filed between 2020 and 2025, spanning 7 technology areas.
What is Kojundo Chemical Laboratory Co., Ltd.'s Innovation Score?
Kojundo Chemical Laboratory Co., Ltd. has an Innovation Score of 39.2 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).
What technology areas does Kojundo Chemical Laboratory Co., Ltd. focus on?
Kojundo Chemical Laboratory Co., Ltd.'s top technology area is 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) with 6 patents. The company has filed patents in 7 CPC subclasses total.
Is Kojundo Chemical Laboratory Co., Ltd.'s patent filing rate increasing or decreasing?
Insufficient historical data is available to calculate a velocity trend for Kojundo Chemical Laboratory Co., Ltd..
What does claim depth mean for Kojundo Chemical Laboratory Co., Ltd.'s patents?
Kojundo Chemical Laboratory Co., Ltd.'s patents average 5.2 claims each. This is relatively simple claim structure, typical for focused inventions.
How is the Kojundo Chemical Laboratory 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.

How to use this portfolio

Kojundo's 6 grants land it in the top 39% 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 - Kojundo ranks #41,195 of 50,000. Top 50 holders
  • Most of this portfolio concentrates in C23C - see who else leads that technology area. C23C 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.