Where does Cnooc Petroleum North America ULC rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Cnooc Petroleum North America ULC ranks #45,762 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 Cnooc Petroleum North America ULC hold?

Cnooc Petroleum North America ULC holds 5 US utility patents granted between 2019 and 2021, spanning 3 technology areas.

What is Cnooc Petroleum North America ULC's Innovation Score?

Cnooc Petroleum North America ULC has an Innovation Score of 23.8 out of 100 (13th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Cnooc Petroleum North America ULC's patent grant rate increasing or decreasing?

Cnooc Petroleum North America ULC's recent grant velocity is +300% compared to the prior five-year period (grant years, not application filing dates). This indicates accelerating grant output.

What does claim depth mean for Cnooc Petroleum North America ULC's patents?

Cnooc Petroleum North America ULC's patents average 19.2 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 Cnooc Petroleum North America ULC 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 Foreign Corporation

Cnooc Petroleum North America ULC

Q: What technology areas does Cnooc Petroleum North America ULC focus on?

Cnooc Petroleum North America ULC'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 5 patents, ranking #669 of 1,363 assignees active in that subclass. Grants appear in 3 CPC subclasses total.

USPTO PatentsView assignee record - 5 granted patents across 3 technology areas, recorded in grant years 2019–2021. 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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The verdict

According to USPTO PatentsView, Cnooc ranks #45,762 of 49,997 tracked US assignees by granted-patent volume, with 5 patents across 3 technology areas.

#45,762
of 49,997 US assignees by volume: 13th percentile
by Innovation Score (23.8/100): 19.2
avg claims per patent: +300%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R45762 · Foreign Corporation #45,762 · 5 grants

GRANTS-MICRO · BOTTOM-DECILE · PHOTO-FINISH · CPC-NARROW · INNOV-THIN · CLAIMS-RICH · TYPE-FRNCORP · VEL-SURGE · BOOK-FULL

GRANTS-MICRO 5 grants
BOTTOM-DECILE #45,762/49,997
PHOTO-FINISH CML International S…
CPC-NARROW E21B · 3 areas
INNOV-THIN 23.8/100
CLAIMS-RICH 19.2 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-SURGE +300% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: CML International 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.

How Cnooc’s 23.8 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 6.2 pts (26%) Velocity 0.0 pts (0%) Breadth 6.1 pts (26%) Claim depth 11.5 pts (48%)

Qualcomm Incorporated · highest

85
Cnooc Petroleum… · this assignee

24
3D Lighting… · lowest

7

What this shows Cnooc's Innovation Score is 23.8/100 (13th 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 Cnooc?

Each dot is one of Cnooc’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). Cnooc’s own 19.2 claims/patent is ABOVE the 11.2 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where Cnooc's grants concentrate

Cnooc Petroleum North America ULC is a focused PatentsView assignee: 3 CPC subclasses with 100% 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 2020 (3 grants) versus a trough of 1 in 2019. By volume, Cnooc sits between CML International S.P.A. and Cobi GmbH.

CML International…

5
CMP Industries

5
Cmtech

5
Cngmotive

5
Coapt

5
Coastal PET Produ…

5
Cobham Colorado S…

5
Cobi

5
Cnooc Petroleum N… ◀

5

What this shows Cnooc holds 5 patents at rank #45,595, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Cnooc

By rank, the assignees closest to #45,595 in granted patent volume.

Leaders in E21B (Earth OR Rock Drilling)

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

Cnooc's Innovation Score vs. every tracked assignee

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

24 13th percentile higher than 13% 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 · 2019–2021

Grants by year

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

View data table

Cnooc Petroleum North America ULC patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2019	1	20.0%
2020	3	60.0%
2021	1	20.0%

Which technologies does Cnooc Petroleum North America ULC patent most?

E21B - Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells 5

G06N - Computing Arrangements Based ON Specific Computational Models 1

G01N - Investigating OR Analysing Materials BY Determining Their Chemical OR Physical Properties 1

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

Cnooc Petroleum North America ULC's patent record in context - here's where to go next.

Cnooc Petroleum North America ULC'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), 100% of its portfolio - see every assignee active in that class. Explore E21B
Ranked #45,762 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Cnooc Petroleum North America ULC against CML International S.P.A., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 23.8/100 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.