Where does Durham Enterprises Corporation rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Durham Enterprises Corporation ranks #31,461 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 Durham Enterprises Corporation hold?

Durham Enterprises Corporation holds 8 US utility patents granted between 2015 and 2024, spanning 3 technology areas.

What is Durham Enterprises Corporation's Innovation Score?

Durham Enterprises Corporation has an Innovation Score of 28.2 out of 100 (26th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Durham Enterprises Corporation's patent grant rate increasing or decreasing?

Durham Enterprises Corporation's recent grant velocity is +600% compared to the prior five-year period (grant years, not application filing dates). This indicates accelerating grant output.

What does claim depth mean for Durham Enterprises Corporation's patents?

Durham Enterprises Corporation's patents average 9.4 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 Durham Enterprises 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

Durham Enterprises Corporation

Q: What technology areas does Durham Enterprises Corporation focus on?

Durham Enterprises Corporation's top technology area is A45D (Hairdressing OR Shaving Equipment ; Equipment FOR Cosmetics OR Cosmetic Treatments, e.g. FOR Manicuring OR Pedicuring) with 4 patents, ranking #133 of 429 assignees active in that subclass. Grants appear in 3 CPC subclasses total.

USPTO PatentsView assignee record - 8 granted patents across 3 technology areas, recorded in grant years 2015–2024. 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: A45D (Hairdressing OR Shaving Equipment ; Equipment FOR Cosmetics OR Cosmetic Treatments, e.g. FOR Manicuring OR Pedicuring).

Compiled by PlainPatent · May 15, 2026

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Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, Durham ranks #31,461 of 49,997 tracked US assignees by granted-patent volume, with 8 patents across 3 technology areas.

#31,461
of 49,997 US assignees by volume: 26th percentile
by Innovation Score (28.2/100): 9.4
avg claims per patent: +600%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R31461 · US Corporation #31,461 · 8 grants

GRANTS-MICRO · MID-PACK · PHOTO-FINISH · CPC-NARROW · INNOV-THIN · CLAIMS-PAR · TYPE-USCORP · VEL-SURGE · BOOK-FULL

GRANTS-MICRO 8 grants
MID-PACK #31,461/49,997
PHOTO-FINISH Drax Power
CPC-NARROW A45D · 3 areas
INNOV-THIN 28.2/100
CLAIMS-PAR 9.4 claims/avg
TYPE-USCORP US Corporation
VEL-SURGE +600% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Drax Power Limited (±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.

How Durham’s 28.2 Innovation Score adds up

The same four weighted components behind every Innovation Score on PlainPatent: portfolio volume, grant velocity, technology breadth, and claim depth.

Volume 7.6 pts (27%) Velocity 8.9 pts (32%) Breadth 6.1 pts (22%) Claim depth 5.6 pts (20%)

Qualcomm Incorporated · highest

85
Durham Enterprises · this assignee

28
3D Lighting… · lowest

7

What this shows Durham's Innovation Score is 28.2/100 (26th percentile 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.

Does more volume mean deeper claims for Durham?

Each dot is one of Durham’s 8 nearest volume peers (same corpus rank neighbourhood as the chart above), placed by total granted patents (horizontal) against average claims per patent (vertical). Durham’s own 9.4 claims/patent is at or below the 13.8 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

Durham vs its 8 nearest volume peers: granted patents vs average claims per patent. Source: USPTO PatentsView.

Where Durham's grants concentrate

Durham Enterprises Corporation is a focused PatentsView assignee: 3 CPC subclasses with 50% of grants classified under A45D (Hairdressing OR Shaving Equipment ; Equipment FOR Cosmetics OR Cosmetic Treatments, e.g. FOR Manicuring OR Pedicuring). Peak complete grant year is 2021 (3 grants) versus a trough of 1 in 2015. By volume, Durham sits between Drax Power Limited and Dürr Ecoclean GmbH.

Durham's three-year grant acceleration

Durham Enterprises Corporation shows 4 grants in 2022–2024 against only 3 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.

Drax Power

8
Dryfhout Properti…

8
Dubois Chemicals

8
Ductmate Industri…

8
Dynavap

8
Dynisco Instrumen…

8
Dyno Nobel Asia P…

8
Dürr Ecoclean

8
Durham Enterprises ◀

8

What this shows Durham holds 8 patents at rank #31,467, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Durham

By rank, the assignees closest to #31,467 in granted patent volume.

Leaders in A45D (Hairdressing OR Shaving Equipment)

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

Durham's Innovation Score vs. every tracked assignee

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

28 26th percentile higher than 26% 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 · 2015–2024

Grants by year

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

View data table

Durham Enterprises Corporation patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	1	12.5%
2021	3	37.5%
2022	1	12.5%
2023	1	12.5%
2024	2	25.0%

Which technologies does Durham Enterprises Corporation patent most?

A45D - Hairdressing OR Shaving Equipment ; Equipment FOR Cosmetics OR Cosmetic Treatments, e.g. FOR Manicuring OR Pedicuring 4

B26D - CUTTING; Details Common TO Machines FOR Perforating, Punching, Cutting-out, Stamping-out OR Severing 2

B65D - Containers FOR Storage OR Transport OF Articles OR Materials, e.g. Bags, Barrels, Bottles, Boxes, Cans, Cartons, Crates, Drums, Jars, Tanks, Hoppers, Forwarding CONTAINERS; Accessories, Closures, OR Fittings THEREFOR; Packaging ELEMENTS; Packages 2

Top 3 of 3 technology areas

More on this record

Data Source

USPTO PatentsView, US granted patents 2015–2025

View all rankings → How is Innovation Score calculated?

What to do with this data

Durham Enterprises Corporation's patent record in context - here's where to go next.

Durham Enterprises Corporation's lead technology class is A45D (Hairdressing OR Shaving Equipment ; Equipment FOR Cosmetics OR Cosmetic Treatments, e.g. FOR Manicuring OR Pedicuring), 50% of its portfolio - see every assignee active in that class. Explore A45D
Ranked #31,461 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Durham Enterprises Corporation against Drax Power Limited, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 28.2/100 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.