USPTO 2015–2025 USPTO PatentsView Foreign Corporation

DNF Co., Ltd

USPTO PatentsView assignee record - 26 granted patents across 16 technology areas, recorded in grant years 2016–2025. 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: 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).

Compiled by PlainPatent, US Patent Intelligence Editorial Process · May 15, 2026

Explore the portfolio See the ranking

Total patents granted

CPC technology areas

11.8

Avg claims per patent

+56%

5-year grant velocity

The verdict

According to USPTO PatentsView, DNF ranks #11,624 of 50,000 tracked US assignees by granted-patent volume, with 26 patents across 16 technology areas.

#11,624
of 50,000 US assignees by volume: Top 34%
by Innovation Score (41.0/100): 11.8
avg claims per patent: +56%
grant velocity, last 5 yrs

Portfolio overview

DNF Co., Ltd has been granted 26 US utility patents between 2016 and 2025, placing DNF Co., Ltd at #11,624 of 50,000 across all assignees tracked by PlainPatent. This portfolio spans 16 distinct Cooperative Patent Classification (CPC) subclasses, averaging 11.8 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, DNF Co., Ltd is one of the more focused assignees in the PatentsView dataset. By volume, DNF sits between D3 Innovation Inc. (26 patents, rank #11,616) and Darkvision Technologies Inc. (26 patents, rank #11,624) - the closest US assignees by grant volume. The composite Innovation Score of 41.0/100 blends portfolio volume, grant velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.

Grant cadence records the difference between two grant-year windows. Between 2020 and 2024 the company received 14 grants, compared with 9 in the 2015–2019 window, a +56% shift in five-year grant velocity. Both windows cover five complete grant years; the latest PatentsView year is a partial release and is excluded from this comparison, though it still appears in the yearly table and chart below. Grant timing can lag the related application by years, so this comparison does not establish current R&D spending, strategic intent, or a company’s application activity. The Foreign Corporation classification provides context for the assignee record, not a conclusion about its business strategy.

Claim depth and technology breadth describe this aggregate record. DNF Co., Ltd's 11.8 average claims per patent is an average count, not a measure of claim scope, legal strength, enforceability, or design-around risk. The record spans 16 CPC subclasses. Combined with portfolio volume, these figures let readers compare the documented grant records of assignees in similar technology classes.

D3 Innovation

26
DELL Internationa…

26
Demerx

26
DMK Deutsches Mil…

26
Dominion Energy

26
Dorma Deutschland

26
DOT Incorporation

26
Darkvision

26
DNF ◀

26

What this shows DNF holds 26 patents at rank #11,620, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near DNF

By rank, the assignees closest to #11,620 in granted patent volume.

Leaders in C23C (Coating Metallic Material)

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

DNF'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 50,000 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 · 2016–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2016–2019 baseline. Full figures in the table below.

View data table

DNF Co., Ltd patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2016	1	3.8%
2017	2	7.7%
2018	2	7.7%
2019	4	15.4%
2021	4	15.4%
2022	7	26.9%
2023	2	7.7%
2024	1	3.8%
2025partial year	3	11.5%

Which technologies does DNF Co., Ltd patent most?

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 21

C07F - ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM 21

H01L - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10 16

C01B - NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C 5

H10D - INORGANIC ELECTRIC SEMICONDUCTOR DEVICES 4

C09D - COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR 4

H10B - ELECTRONIC MEMORY DEVICES 3

C08G - MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 2

H10K - ORGANIC ELECTRIC SOLID-STATE DEVICES 2

Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS 2

C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS 1

B05D - PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL 1

C08L - COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 1

G03F - PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; 1

H10N - ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR 1

Top 15 of 16 technology areas

Grant record at a glance

Portfolio Volume 26 grants

CPC subclasses 16

Avg. claims / grant 11.8

Velocity +56%

Historical grant data only; it does not rate legal strength or current strategy.

Where it ranks

Overall rank by patents

#11,624

of 50,000 tracked assignees

Innovation Score

41.0 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

Frequently Asked Questions

Where does DNF Co., Ltd rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), DNF Co., Ltd ranks #11,624 of 50,000 assignees by granted-patent volume, the same sort as the companies listing and top-holders ranking. See /methodology/#corpus-placement.

How many patents does DNF Co., Ltd hold?

DNF Co., Ltd holds 26 US utility patents granted between 2016 and 2025, spanning 16 technology areas.

What is DNF Co., Ltd's Innovation Score?

DNF Co., Ltd has an Innovation Score of 41.0 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 DNF Co., Ltd focus on?

DNF 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 21 patents. Grants appear in 16 CPC subclasses total.

Is DNF Co., Ltd's patent grant rate increasing or decreasing?

DNF Co., Ltd's recent grant velocity is +56% compared to the prior five-year period (grant years, not application filing dates). This indicates accelerating grant output.

What does claim depth mean for DNF Co., Ltd's patents?

DNF Co., Ltd's patents average 11.8 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 DNF 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

DNF's 26 grants land it in the top 34% 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 - DNF ranks #11,624 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

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.