USPTO 2015–2025 USPTO PatentsView US Corporation

National Oilwell DHT, L.p.

USPTO PatentsView assignee record - 54 granted patents across 21 technology areas, active 2015–2024. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: E21B (EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS).

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

Explore the portfolio See the ranking

Total patents granted

CPC technology areas

20.3

Avg claims per patent

-20%

5-year filing velocity

The verdict

National holds 54 US patents across 21 technology areas, rank #6,259 of 50,000 tracked assignees.

#6,259
of 50,000 US assignees by volume: Top 27%
by Innovation Score (43.8/100): 20.3
avg claims per patent: -20%
filing velocity, last 5 yrs

Portfolio overview

National Oilwell DHT, L.p. has been granted 54 US utility patents between 2015 and 2024, placing National Oilwell DHT, L.p. at rank #6,259 across all assignees tracked by PlainPatent. This portfolio spans 21 distinct Cooperative Patent Classification (CPC) subclasses, averaging 20.3 claims per patent with primary concentration in E21B (EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS). As a US Corporation, National Oilwell DHT, L.p. is one of the more focused assignees in the PatentsView dataset. By volume, National sits between Morphosys Ag (54 patents, rank #6,255) and Poly-clip System Gmbh & Co. KG (54 patents, rank #6,263) - the closest US assignees by grant volume. The composite Innovation Score of 43.8/100 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 24 grants, compared with 30 in the 2015–2019 window, a -20% shift in five-year velocity. A cooling filing rate may reflect portfolio consolidation, shifting priorities, or reduced R&D throughput. 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. National Oilwell DHT, L.p.'s 20.3 average claims per patent reflects complex, broadly scoped inventions that are difficult for competitors to design around, while a multi-domain presence across 21 subclasses balances depth with breadth. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark National Oilwell DHT, L.p. against peers pursuing similar technology classes.

Morphosys

54
Microsemi Storage…

54
Mojo Mobility

54
Moteurs Leroy-som…

54
Nidec READ

54
Nitto Boseki

54
Outotec Oyj

54
Poly-clip System…

54
National Oilwell… ◀

54

What this shows National holds 54 patents at rank #6,259, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near National

By rank, the assignees closest to #6,259 in granted patent volume.

Leaders in E21B (Earth OR ROCK Drilling)

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

National's Innovation Score vs. every tracked assignee

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

44 Top 27% higher than 73% 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 · 2015–2024

Grants by year

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

View data table

National Oilwell DHT, L.p. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	4	7.4%
2016	5	9.3%
2017	9	16.7%
2018	5	9.3%
2019	7	13.0%
2020	8	14.8%
2021	10	18.5%
2022	4	7.4%
2024	2	3.7%

Which technologies does National Oilwell DHT, L.p. patent most?

E21B - EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS 53

B24D - TOOLS FOR GRINDING, BUFFING OR SHARPENING 9

C22C - ALLOYS 6

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 5

B22F - WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER ; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER 4

G01V - GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS 2

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

Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION 2

C04B - LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE ; CERAMICS ; REFRACTORIES; TREATMENT OF NATURAL STONE 2

F04C - ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS ; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS 2

F16D - COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES 2

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

C09J - ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES 1

C08L - COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 1

C01B - NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C 1

Top 15 of 21 technology areas

Patent Moat Analysis

Portfolio Volume Light

Tech Breadth Multi-domain

Claim Depth Complex

Velocity Declining

Where it ranks

Overall rank by patents

#6,259

Across all tracked assignees

Innovation Score

43.8 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 National Oilwell DHT, L.p. hold?

National Oilwell DHT, L.p. holds 54 US granted patents filed between 2015 and 2024, spanning 21 technology areas.

What is National Oilwell DHT, L.p.'s Innovation Score?

National Oilwell DHT, L.p. has an Innovation Score of 43.8 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does National Oilwell DHT, L.p. focus on?

National Oilwell DHT, L.p.'s top technology area is E21B (EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS) with 53 patents. The company has filed patents in 21 CPC subclasses total.

Is National Oilwell DHT, L.p.'s patent filing rate increasing or decreasing?

National Oilwell DHT, L.p.'s recent filing velocity is -20% compared to the prior five-year period. Filing activity has slowed relative to earlier years.

What does claim depth mean for National Oilwell DHT, L.p.'s patents?

National Oilwell DHT, L.p.'s patents average 20.3 claims each. This indicates complex, broadly scoped patents that are harder for competitors to design around.

How is the National Oilwell DHT, L.p. 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

National's 54 grants land it in the top 27% 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 - National ranks #6,259 of 50,000. Top 50 holders
Most of this portfolio concentrates in E21B - see who else leads that technology area. E21B 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.