Where does Clearsign Combustion Corporation rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Clearsign Combustion Corporation ranks #4,372 of 49,997 assignees by granted-patent volume, the same sort as the companies listing and top-holders ranking. See /methodology/#corpus-placement.

How many patents does Clearsign Combustion Corporation hold?

Clearsign Combustion Corporation holds 81 US utility patents granted between 2015 and 2022, spanning 42 technology areas.

What is Clearsign Combustion Corporation's Innovation Score?

Clearsign Combustion Corporation has an Innovation Score of 53.5 out of 100 (top 9% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Clearsign Combustion Corporation's patent grant rate increasing or decreasing?

Clearsign Combustion Corporation's recent grant velocity is -95% compared to the prior five-year period (grant years, not application filing dates). Grant activity has slowed relative to earlier years.

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

Clearsign Combustion Corporation's patents average 30.3 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 Clearsign Combustion 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.

USPTO 2015–2025 USPTO PatentsView US Corporation

Clearsign Combustion Corporation

Q: What technology areas does Clearsign Combustion Corporation focus on?

Clearsign Combustion Corporation's top technology area is F23C (Methods OR Apparatus FOR Combustion Using Fluid Fuel OR Solid Fuel Suspended IN ; A Carrier GAS OR; AIR) with 65 patents. Grants appear in 42 CPC subclasses total.

USPTO PatentsView assignee record - 81 granted patents across 42 technology areas, recorded in grant years 2015–2022. 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: F23C (Methods OR Apparatus FOR Combustion Using Fluid Fuel OR Solid Fuel Suspended IN ; A Carrier GAS OR; AIR).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Clearsign ranks #4,372 of 49,997 tracked US assignees by granted-patent volume, with 81 patents across 42 technology areas.

#4,372
of 49,997 US assignees by volume: Top 9%
by Innovation Score (53.5/100): 30.3
avg claims per patent: -95%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R4372 · US Corporation #4,372 · 81 grants

GRANTS-SMALL · TOP-DECILE · PHOTO-FINISH · CPC-WIDE · INNOV-PAR · CLAIMS-DENSE · TYPE-USCORP · VEL-DROP · BOOK-FULL

GRANTS-SMALL 81 grants
TOP-DECILE #4,372/49,997
PHOTO-FINISH Arper S P A
CPC-WIDE F23C · 42 areas
INNOV-PAR 53.5/100
CLAIMS-DENSE 30.3 claims/avg
TYPE-USCORP US Corporation
VEL-DROP -95% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Arper S.P.A. (±0 grants)

Instrument codes from this assignee’s USPTO PatentsView grant sheet: volume band, corpus rank, photo-finish peer, lead CPC, Innovation Score, claim depth, assignee type, velocity, and book completeness. Not a USPTO rating of patent strength.

Qualcomm Incorporated · highest

85
Alcatel-Lucent USA · near

53
Clearsign Combustion · this assignee

53
Paul Scherrer Institut · near

53
Rockspoon · near

53
Shandong NEW… · near

53
3D Lighting… · lowest

7

What this shows Clearsign's Innovation Score is 53.5/100 (top 9% of the PatentsView-derived corpus). The chart places that score against the nearest Innovation Score peers plus corpus poles, not a reprint of the volume ranking.

Where Clearsign's grants concentrate

Clearsign Combustion Corporation is a focused PatentsView assignee: 42 CPC subclasses with 80.2% of grants classified under F23C (Methods OR Apparatus FOR Combustion Using Fluid Fuel OR Solid Fuel Suspended IN ; A Carrier GAS OR; AIR). Peak complete grant year is 2018 (22 grants) versus a trough of 1 in 2022. By volume, Clearsign sits between Arper S.P.A. and Consolidated Nuclear Security, LLC.

Clearsign's three-year grant acceleration

Clearsign Combustion Corporation shows 1 grants in 2022–2024 against only 19 in 2019–2021. That prior window is too thin for a growth multiple (rename and spin-out assignees look artificially high when the baseline is near zero), so PlainPatent withholds a ranked acceleration claim here.

Arper S P A

81
BSH Bosch und Sie…

81
Borealis Technical

81
Camelbak Products

81
Clemson Universit…

81
Cvdevices

81
Children's Health…

81
Consolidated Nucl…

81
Clearsign Combust… ◀

81

What this shows Clearsign holds 81 patents at rank #4,371, 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 #4,371 in granted patent volume.

Leaders in F23C (Methods OR Apparatus FOR Combustion Using Fluid Fuel OR S…)

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

Assignees with similar portfolio profiles

Two PlainPatent-derived peer sets for Clearsign, neither rank-band nor same-CPC leaders (those blocks stay above).

Similar innovation score

Nearest assignees by Innovation Score (53 here).

Paul Scherrer Institut 53 Rockspoon, Inc 53 Shandong NEW Beiyang Information Technology Co., Ltd. 53 Alcatel-Lucent USA Inc. 53

Similar claim depth

Nearest assignees by average claims per patent (30.3 here).

SAS Institute, Inc. 30.3 avg Tokitae LLC 30.2 avg Reservoir Labs, Inc. 30.3 avg Levi Strauss & Co. 30.1 avg

Clearsign's Innovation Score vs. every tracked assignee

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

53 Top 9% higher than 91% of 49,997 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 · 2015–2022

Grants by year

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

View data table

Clearsign Combustion Corporation patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	2	2.5%
2016	21	25.9%
2017	16	19.8%
2018	22	27.2%
2019	16	19.8%
2020	3	3.7%
2022	1	1.2%

Which technologies does Clearsign Combustion Corporation patent most?

F23C - Methods OR Apparatus FOR Combustion Using Fluid Fuel OR Solid Fuel Suspended IN ; A Carrier GAS OR; AIR 65

F23D - Burners 48

F23N - Regulating OR Controlling Combustion 40

Y02T - Climate Change Mitigation Technologies Related TO Transportation 10

F23B - Methods OR Apparatus FOR Combustion Using Only Solid Fuel 9

Y02E - Reduction OF Greenhouse GAS [GHG] Emissions, Related TO Energy Generation, Transmission OR Distribution 9

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 9

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 9

F23Q - Ignition ; Extinguishing-devices 8

F23J - Removal OR Treatment OF Combustion Products OR Combustion RESIDUES; Flues 7

F23G - Cremation FURNACES; Consuming Waste Products BY Combustion 6

F01N - Gas-flow Silencers OR Exhaust Apparatus FOR Machines OR Engines IN GENERAL; Gas-flow Silencers OR Exhaust Apparatus FOR Internal-combustion Engines 5

B01D - Separation 5

Y10T - Technical Subjects Covered BY Former US Classification 4

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

Top 15 of 42 technology areas

Where it ranks

Overall rank by patents

#4,372

of 49,997 tracked assignees

Innovation Score

53.5 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

What to do with this data

Clearsign Combustion Corporation's patent record in context - here's where to go next.

Clearsign Combustion Corporation's lead technology class is F23C (Methods OR Apparatus FOR Combustion Using Fluid Fuel OR Solid Fuel Suspended IN ; A Carrier GAS OR; AIR), 80.2% of its portfolio - see every assignee active in that class. Explore F23C
Ranked #4,372 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Clearsign Combustion Corporation against Arper S.P.A., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 53.5/100 blends volume, velocity, technology breadth, and claim depth. How it's calculated

Figures reflect USPTO PatentsView grant data through May 2026; pending applications not yet granted are not counted.

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.