PlainPatent
USPTO 2015–2025 USPTO PatentsView Foreign Corporation

China Oilfield Services Limited

USPTO PatentsView assignee record - 21 granted patents across 18 technology areas, recorded in grant years 2016–2025. 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).

Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, China ranks #13,917 of 50,000 tracked US assignees by granted-patent volume, with 21 patents across 18 technology areas.

#13,917
of 50,000 US assignees by volume
Top 34%
by Innovation Score (41.1/100)
12.7
avg claims per patent
+13%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R13917 · Foreign Corporation #13,917 · 21 grants

GRANTS-SMALL · MID-PACK · PHOTO-FINISH · CPC-FOCUS · INNOV-PAR · CLAIMS-RICH · TYPE-FRNCORP · VEL-UP · BOOK-FULL

  • GRANTS-SMALL 21 grants
  • MID-PACK #13,917/50,000
  • PHOTO-FINISH CELENO COMMUNICATION…
  • CPC-FOCUS E21B · 18 areas
  • INNOV-PAR 41.1/100
  • CLAIMS-RICH 12.7 claims/avg
  • TYPE-FRNCORP Foreign Corp
  • VEL-UP +13% vel
  • BOOK-FULL 10/10 fields

Nearest grant-volume peer: Celeno Communications (israel) Ltd. (±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.

Innovation-score neighbourhood around China

Lowest and highest poles plus nearest Innovation Score peers, not a full corpus board reprint.

score

What this shows China Oilfield Services Limited stamps GRANTS-SMALL, MID-PACK, PHOTO-FINISH, CPC-FOCUS, INNOV-PAR, CLAIMS-RICH, TYPE-FRNCORP, VEL-UP, BOOK-FULL. Volume places it #13,917 of 50,000; Innovation Score 41.1/100 sits in the top 34% of the PatentsView-derived corpus. Closest grant-volume peer on this plate is Celeno Communications (israel) Ltd. (±0 grants).

Source USPTO PatentsView, PlainPatent Innovation Score As of 2015–2025

Portfolio overview

China Oilfield Services Limited has been granted 21 US utility patents between 2016 and 2025, placing China Oilfield Services Limited at #13,917 of 50,000 across all assignees tracked by PlainPatent. This portfolio spans 18 distinct Cooperative Patent Classification (CPC) subclasses, averaging 12.7 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 Foreign Corporation, China Oilfield Services Limited is one of the more focused assignees in the PatentsView dataset. By volume, China sits between Celeno Communications (israel) Ltd. (21 patents, rank #13,904) and Collibra Belgium BV (21 patents, rank #13,912) - the closest US assignees by grant volume. The composite Innovation Score of 41.1/100 blends portfolio volume, grant velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.

Grant cadence records the difference between two grant-year windows. Between 2020 and 2024 the company received 9 grants, compared with 8 in the 2015–2019 window, a +13% shift in five-year grant velocity. Both windows cover five complete grant years; the latest PatentsView year is a partial release and is excluded from this comparison, though it still appears in the yearly table and chart below. Grant timing can lag the related application by years, so this comparison does not establish current R&D spending, strategic intent, or a company’s application activity. The Foreign Corporation classification provides context for the assignee record, not a conclusion about its business strategy.

Claim depth and technology breadth describe this aggregate record. China Oilfield Services Limited's 12.7 average claims per patent is an average count, not a measure of claim scope, legal strength, enforceability, or design-around risk. The record spans 18 CPC subclasses. Combined with portfolio volume, these figures let readers compare the documented grant records of assignees in similar technology classes.

Who files at China's volume?

Granted US patents 2015–2025 versus its nearest-ranked assignees by volume, this company marked ◀

patents

What this shows China holds 21 patents at rank #13,908, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Source USPTO PatentsView, granted utility patents As of 2015–2025

Companies ranked near China

By rank, the assignees closest to #13,908 in granted patent volume.

Leaders in E21B (Earth OR ROCK Drilling)

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

China's Innovation Score vs. every tracked assignee

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

41 Top 34% higher than 66% of 50,000 US assignees

0–10: 687 US assignees (1%). Below this entry. 10–20: 2,527 US assignees (5%). Below this entry. 20–30: 13,162 US assignees (26%). Below this entry. 30–40: 15,294 US assignees (31%). Below this entry. 40–50: 11,491 US assignees (23%). This entry sits in this band. 50–60: 5,058 US assignees (10%). Above this entry. 60–70: 1,537 US assignees (3%). Above this entry. 70–80: 234 US assignees (0%). Above this entry. 80–90: 10 US assignees (0%). Above this entry. 90–100: 0 US assignees (0%). Above this entry. This assignee 0 100 every tracked assignee, bucketed by value

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

012345 2016201820192021202320242025 4
USPTO utility patent grants by year · 2016–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2016–2019 baseline. Full figures in the table below.

View data table
China Oilfield Services Limited patent grants by year, 2015–2025
Year Patents Granted Share of Period
2016 1 4.8%
2018 3 14.3%
2019 4 19.0%
2021 2 9.5%
2023 3 14.3%
2024 4 19.0%
2025partial year 4 19.0%

Which technologies does China Oilfield Services Limited patent most?

Top 15 of 18 technology areas

Where it ranks

Overall rank by patents

#13,917

of 50,000 tracked assignees

Innovation Score

41.1 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

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.