Where does National Oilwell DHT, L.P. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), National Oilwell DHT, L.P. ranks #6,260 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 National Oilwell DHT, L.P. hold?

National Oilwell DHT, L.P. holds 54 US utility patents granted 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 (top 27% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is National Oilwell DHT, L.P.'s patent grant rate increasing or decreasing?

National Oilwell DHT, L.P.'s recent grant velocity is -20% 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 National Oilwell DHT, L.P.'s patents?

National Oilwell DHT, L.P.'s patents average 20.3 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 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.

USPTO 2015–2025 USPTO PatentsView US Corporation

National Oilwell DHT, L.P.

Q: 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, ranking #64 of 1,363 assignees active in that subclass. Grants appear in 21 CPC subclasses total.

USPTO PatentsView assignee record - 54 granted patents across 21 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: E21B (Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells).

Compiled by PlainPatent · May 15, 2026

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Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, National ranks #6,260 of 49,997 tracked US assignees by granted-patent volume, with 54 patents across 21 technology areas.

#6,260
of 49,997 US assignees by volume: Top 27%
by Innovation Score (43.8/100): 20.3
avg claims per patent: -20%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R6260 · US Corporation #6,260 · 54 grants

GRANTS-SMALL · UPPER-Q · PHOTO-FINISH · CPC-FOCUS · INNOV-PAR · CLAIMS-DENSE · TYPE-USCORP · VEL-DOWN · BOOK-FULL

GRANTS-SMALL 54 grants
UPPER-Q #6,260/49,997
PHOTO-FINISH Microsemi Storage…
CPC-FOCUS E21B · 21 areas
INNOV-PAR 43.8/100
CLAIMS-DENSE 20.3 claims/avg
TYPE-USCORP US Corporation
VEL-DOWN -20% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Microsemi Storage Solutions (U.S.), Inc. (±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 National’s 43.8 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 13.8 pts (32%) Velocity 1.6 pts (4%) Breadth 16.2 pts (37%) Claim depth 12.2 pts (28%)

Qualcomm Incorporated · highest

85
Outotec Oyj · near

44
Zhongshan Innocloud… · near

44
Cabot Microelectronics · near

44
National Oilwell DHT · this assignee

44
SDG · near

44
3D Lighting… · lowest

7

What this shows National's Innovation Score is 43.8/100 (top 27% 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 National?

Each dot is one of National’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). National’s own 20.3 claims/patent is ABOVE the 13.8 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where National's grants concentrate

National Oilwell DHT, L.P. is a focused PatentsView assignee: 21 CPC subclasses with 98.1% of grants classified under E21B (Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells). Peak complete grant year is 2021 (10 grants) versus a trough of 2 in 2024. By volume, National sits between Morphosys AG and Poly-clip System GMBH & Co. KG.

National's three-year grant acceleration

From 2019–2021 to 2022–2024, National Oilwell DHT, L.P. moved from 25 to 6 grants (0.24x the prior three-year total, a multiple, not a CAGR). See the growth leaderboard.

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.

Assignees with similar portfolio profiles

Two PlainPatent-derived peer sets for National, neither rank-band nor same-CPC leaders (those blocks stay above). In E21B (Earth OR Rock Drilling), National ranks #64 of 1,363 assignees by patent count in that subclass.

Similar innovation score

Nearest assignees by Innovation Score (44 here).

Cabot Microelectronics Corporation 44 SDG, LLC 44 Outotec Oyj 44 Zhongshan Innocloud Intellectual Property Services Co., Ltd. 44

Similar claim depth

Nearest assignees by average claims per patent (20.3 here).

Qwest Communications International Inc. 20.3 avg Takara Bio USA, Inc. 20.3 avg Amyris, Inc. 20.3 avg NBCUniversal Media, LLC 20.3 avg

National's Innovation Score vs. every tracked assignee

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

44 Top 27% higher than 73% 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

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

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

National Oilwell DHT, L.P.'s patent record in context - here's where to go next.

National Oilwell DHT, L.P.'s lead technology class is E21B (Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells), 98.1% of its portfolio - see every assignee active in that class. Explore E21B
Ranked #6,260 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare National Oilwell DHT, L.P. against Morphosys AG, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 43.8/100 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.