Where does AK Steel Properties, Inc. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), AK Steel Properties, Inc. ranks #20,707 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 AK Steel Properties, Inc. hold?

AK Steel Properties, Inc. holds 13 US utility patents granted between 2015 and 2020, spanning 16 technology areas.

What is AK Steel Properties, Inc.'s Innovation Score?

AK Steel Properties, Inc. has an Innovation Score of 30.8 out of 100 (top 64% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is AK Steel Properties, Inc.'s patent grant rate increasing or decreasing?

AK Steel Properties, Inc.'s recent grant velocity is +17% compared to the prior five-year period (grant years, not application filing dates). The company is maintaining or growing its granted-patent output.

What does claim depth mean for AK Steel Properties, Inc.'s patents?

AK Steel Properties, Inc.'s patents average 12.5 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 AK Steel Properties, Inc. 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

AK Steel Properties, Inc.

Q: What technology areas does AK Steel Properties, Inc. focus on?

AK Steel Properties, Inc.'s top technology area is C21D (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING) with 6 patents. Grants appear in 16 CPC subclasses total.

USPTO PatentsView assignee record - 13 granted patents across 16 technology areas, recorded in grant years 2015–2020. 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: C21D (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING).

Compiled by PlainPatent · May 15, 2026

Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, AK ranks #20,707 of 50,000 tracked US assignees by granted-patent volume, with 13 patents across 16 technology areas.

#20,707
of 50,000 US assignees by volume: Top 64%
by Innovation Score (30.8/100): 12.5
avg claims per patent: +17%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R20707 · US Corporation #20,707 · 13 grants

GRANTS-MICRO · MID-PACK · PHOTO-FINISH · CPC-FOCUS · INNOV-THIN · CLAIMS-RICH · TYPE-USCORP · VEL-UP · BOOK-FULL

GRANTS-MICRO 13 grants
MID-PACK #20,707/50,000
PHOTO-FINISH AIREON
CPC-FOCUS C21D · 16 areas
INNOV-THIN 30.8/100
CLAIMS-RICH 12.5 claims/avg
TYPE-USCORP US Corporation
VEL-UP +17% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Aireon Llc (±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
AK Steel Properties · this assignee

31
3D Lighting Innovati… · lowest

7

What this shows AK's Innovation Score is 30.8/100 (top 64% 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 AK's grants concentrate

AK Steel Properties, Inc. is a focused PatentsView assignee: 16 CPC subclasses with 46.2% of grants classified under C21D (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING). Peak complete grant year is 2020 (7 grants) versus a trough of 1 in 2015. By volume, AK sits between Aireon Llc and All-logic INT. Co., Ltd..

Aireon

13
Airway Medix

13
Aisin KAKO

13
AK Globaltech

13
Akwel

13
ALD Group

13
ALL Packaging

13
All-logic INT

13
AK Steel Properti… ◀

13

What this shows AK holds 13 patents at rank #20,693, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near AK

By rank, the assignees closest to #20,693 in granted patent volume.

Leaders in C21D (Modifying THE Physical Structure OF Ferrous Metals)

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

AK's Innovation Score vs. every tracked assignee

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

31 Top 64% higher than 36% 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 · 2015–2020

Grants by year

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

View data table

AK Steel Properties, Inc. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	1	7.7%
2017	3	23.1%
2018	2	15.4%
2020	7	53.8%

Which technologies does AK Steel Properties, Inc. patent most?

C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING 6

Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION 4

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 3

C08K - Use of inorganic or non-macromolecular organic substances as compounding ingredients 3

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 3

C22C - ALLOYS 3

B08B - CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL 1

C23G - CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS 1

C25F - PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR 1

B22D - CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES 1

H01F - MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES 1

B21D - WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL 1

Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS 1

C23F - NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE ; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D 1

C25D - PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR 1

Top 15 of 16 technology areas

Where it ranks

Overall rank by patents

#20,707

of 50,000 tracked assignees

Innovation Score

30.8 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

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.