USPTO 2015–2025 USPTO PatentsView US Corporation

Clearsign Technologies Corporation

USPTO PatentsView assignee record - 28 granted patents across 15 technology areas, active 2020–2025. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: F23D (BURNERS).

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

Explore the portfolio See the ranking

Total patents granted

CPC technology areas

34.0

Avg claims per patent

5-year filing velocity

The verdict

Clearsign holds 28 US patents across 15 technology areas, rank #10,903 of 50,000 tracked assignees.

#10,903
of 50,000 US assignees by volume: Top 22%
by Innovation Score (46.0/100): 34.0
avg claims per patent

Portfolio overview

Clearsign Technologies Corporation has been granted 28 US utility patents between 2020 and 2025, placing Clearsign Technologies Corporation at rank #10,903 across all assignees tracked by PlainPatent. This portfolio spans 15 distinct Cooperative Patent Classification (CPC) subclasses, averaging 34.0 claims per patent with primary concentration in F23D (BURNERS). As a US Corporation, Clearsign Technologies Corporation is one of the more focused assignees in the PatentsView dataset. By volume, Clearsign sits between Cianna Medical, Inc. (28 patents, rank #10,899) and Dispelix OY (28 patents, rank #10,907) - the closest US assignees by grant volume. The composite Innovation Score of 46.0/100 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. Historical data spans 2020 through 2025, with 28 total grants over that period. Velocity comparisons require five years of historical filings to calibrate. The US 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. Clearsign Technologies Corporation's 34.0 average claims per patent reflects complex, broadly scoped inventions that are difficult for competitors to design around, while concentration in 15 subclasses points to a focused technical program. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark Clearsign Technologies Corporation against peers pursuing similar technology classes.

Cianna Medical

28
Clariant Produkte…

28
Clean Energy Labs

28
Clearcam

28
Comau

28
Comcast Interacti…

28
Crystaphase Produ…

28
Dispelix OY

28
Clearsign ◀

28

What this shows Clearsign holds 28 patents at rank #10,903, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Clearsign

By rank, the assignees closest to #10,903 in granted patent volume.

Leaders in F23D (Burners)

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

Clearsign's Innovation Score vs. every tracked assignee

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

46 Top 22% higher than 78% 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 · 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

Clearsign Technologies Corporation patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2020	10	35.7%
2021	4	14.3%
2022	6	21.4%
2024	6	21.4%
2025	2	7.1%

Which technologies does Clearsign Technologies Corporation patent most?

F23D - BURNERS 25

F23C - METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN ; A CARRIER GAS OR; AIR 17

F23N - REGULATING OR CONTROLLING COMBUSTION 15

F27D - DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE 5

Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION 5

F23M - CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR 4

F23Q - IGNITION ; EXTINGUISHING-DEVICES 3

Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION 2

F27B - FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS 2

G01M - TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR 2

G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES 2

F23L - SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS ; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES 2

F23R - GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS 1

B23P - METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS 1

H05H - PLASMA TECHNIQUE ; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS 1

Top 15 of 15 technology areas

Patent Moat Analysis

Portfolio Volume Light

Tech Breadth Focused

Claim Depth Complex

Where it ranks

Overall rank by patents

#10,903

Across all tracked assignees

Innovation Score

46.0 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 Clearsign Technologies Corporation hold?

Clearsign Technologies Corporation holds 28 US granted patents filed between 2020 and 2025, spanning 15 technology areas.

What is Clearsign Technologies Corporation's Innovation Score?

Clearsign Technologies Corporation has an Innovation Score of 46.0 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Clearsign Technologies Corporation focus on?

Clearsign Technologies Corporation's top technology area is F23D (BURNERS) with 25 patents. The company has filed patents in 15 CPC subclasses total.

Is Clearsign Technologies Corporation's patent filing rate increasing or decreasing?

Insufficient historical data is available to calculate a velocity trend for Clearsign Technologies Corporation.

What does claim depth mean for Clearsign Technologies Corporation's patents?

Clearsign Technologies Corporation's patents average 34.0 claims each. This indicates complex, broadly scoped patents that are harder for competitors to design around.

How is the Clearsign Technologies 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

Clearsign's 28 grants land it in the top 22% 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 - Clearsign ranks #10,903 of 50,000. Top 50 holders
Most of this portfolio concentrates in F23D - see who else leads that technology area. F23D 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.