USPTO 2015–2025 USPTO PatentsView Foreign Corporation

Showa Denko K.k.

USPTO PatentsView assignee record - 589 granted patents across 146 technology areas, active 2015–2025. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: Y02E (REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION).

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

Explore the portfolio See the ranking

589

Total patents granted

146

CPC technology areas

10.7

Avg claims per patent

-19%

5-year filing velocity

The verdict

Showa holds 589 US patents across 146 technology areas, rank #778 of 50,000 tracked assignees.

#778
of 50,000 US assignees by volume: Top 5%
by Innovation Score (58.0/100): 10.7
avg claims per patent: -19%
filing velocity, last 5 yrs

Portfolio overview

Showa Denko K.k. has been granted 589 US utility patents between 2015 and 2025, placing Showa Denko K.k. at rank #778 across all assignees tracked by PlainPatent. This portfolio spans 146 distinct Cooperative Patent Classification (CPC) subclasses, averaging 10.7 claims per patent with primary concentration in Y02E (REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION). As a Foreign Corporation, Showa Denko K.k. is one of the broader-portfolio assignees in the PatentsView dataset. By volume, Showa sits between Washington University (594 patents, rank #774) and Phoenix Contact Gmbh & Co. KG (587 patents, rank #782) - the closest US assignees by grant volume. The composite Innovation Score of 58.0/100 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 263 grants, compared with 326 in the 2015–2019 window, a -19% 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. Showa Denko K.k.'s 10.7 average claims per patent suggests focused, narrowly drawn claims typical of single-invention filings, while a diversified footprint across 100+ CPC subclasses spreads risk across many technology fronts. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark Showa Denko K.k. against peers pursuing similar technology classes.

Washington Univer…

594
OPEN TEXT

591
Baxter Healthcare

590
Carnegie Mellon U…

589
Tohoku University

589
Showa Denko K K ◀

589
Kyoto University

588
Kokusai Electric

587
Phoenix Contact &…

587

What this shows Showa holds 589 patents at rank #778, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Showa

By rank, the assignees closest to #778 in granted patent volume.

Leaders in Y02E (Reduction OF Greenhouse GAS [GHG] Emissions)

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

Showa's Innovation Score vs. every tracked assignee

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

58 Top 5% higher than 95% 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 · 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

Showa Denko K.k. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	88	14.9%
2016	79	13.4%
2017	64	10.9%
2018	55	9.3%
2019	40	6.8%
2020	61	10.4%
2021	79	13.4%
2022	71	12.1%
2023	48	8.1%
2024	3	0.5%
2025	1	0.2%

Which technologies does Showa Denko K.k. patent most?

Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION 108

G11B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER 103

H01M - PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY 102

C30B - SINGLE-CRYSTAL GROWTH ; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL ; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE ; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WI 86

H01L - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10 83

C01B - NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C 60

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 56

B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS 50

C07C - ACYCLIC OR CARBOCYCLIC COMPOUNDS 47

H01G - CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE 42

C08G - MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 41

Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS 37

C08F - MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS 37

Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION 32

C22C - ALLOYS 30

Top 15 of 146 technology areas

Patent Moat Analysis

Portfolio Volume Moderate

Tech Breadth Diversified

Claim Depth Simple

Velocity Declining

Where it ranks

Overall rank by patents

#778

Across all tracked assignees

Innovation Score

58.0 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 Showa Denko K.k. hold?

Showa Denko K.k. holds 589 US granted patents filed between 2015 and 2025, spanning 146 technology areas.

What is Showa Denko K.k.'s Innovation Score?

Showa Denko K.k. has an Innovation Score of 58.0 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Showa Denko K.k. focus on?

Showa Denko K.k.'s top technology area is Y02E (REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION) with 108 patents. The company has filed patents in 146 CPC subclasses total.

Is Showa Denko K.k.'s patent filing rate increasing or decreasing?

Showa Denko K.k.'s recent filing velocity is -19% compared to the prior five-year period. Filing activity has slowed relative to earlier years.

What does claim depth mean for Showa Denko K.k.'s patents?

Showa Denko K.k.'s patents average 10.7 claims each. This is relatively simple claim structure, typical for focused inventions.

How is the Showa Denko K.k. 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

Showa's 589 grants land it in the top 5% 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 - Showa ranks #778 of 50,000. Top 50 holders
Most of this portfolio concentrates in Y02E - see who else leads that technology area. Y02E 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

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · 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.