Where does Zenith Oilfield Technology Limited rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Zenith Oilfield Technology Limited ranks #27,893 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 Zenith Oilfield Technology Limited hold?

Zenith Oilfield Technology Limited holds 10 US utility patents granted between 2016 and 2023, spanning 8 technology areas.

What is Zenith Oilfield Technology Limited's Innovation Score?

Zenith Oilfield Technology Limited has an Innovation Score of 33.7 out of 100 (45th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Zenith Oilfield Technology Limited's patent grant rate increasing or decreasing?

Zenith Oilfield Technology Limited's recent grant velocity is -75% 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 Zenith Oilfield Technology Limited's patents?

Zenith Oilfield Technology Limited's patents average 20.2 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 Zenith Oilfield Technology Limited 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

Zenith Oilfield Technology Limited

Q: What technology areas does Zenith Oilfield Technology Limited focus on?

Zenith Oilfield Technology Limited'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 9 patents. Grants appear in 8 CPC subclasses total.

USPTO PatentsView assignee record - 10 granted patents across 8 technology areas, recorded in grant years 2016–2023. 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, Zenith ranks #27,893 of 49,997 tracked US assignees by granted-patent volume, with 10 patents across 8 technology areas.

#27,893
of 49,997 US assignees by volume: 45th percentile
by Innovation Score (33.7/100): 20.2
avg claims per patent: -75%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R27893 · Foreign Corporation #27,893 · 10 grants

GRANTS-MICRO · MID-PACK · PHOTO-FINISH · CPC-NARROW · INNOV-THIN · CLAIMS-DENSE · TYPE-FRNCORP · VEL-DROP · BOOK-FULL

GRANTS-MICRO 10 grants
MID-PACK #27,893/49,997
PHOTO-FINISH ZapGo
CPC-NARROW E21B · 8 areas
INNOV-THIN 33.7/100
CLAIMS-DENSE 20.2 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DROP -75% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: ZapGo 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.

Qualcomm Incorporated · highest

85
Zenith Oilfield… · this assignee

34
3D Lighting… · lowest

7

What this shows Zenith's Innovation Score is 33.7/100 (45th 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.

Where Zenith's grants concentrate

Zenith Oilfield Technology Limited is a focused PatentsView assignee: 8 CPC subclasses with 90% 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 2018 (4 grants) versus a trough of 1 in 2016. By volume, Zenith sits between ZapGo Ltd and Zhejiang Guyuehu Industry and Trade Co., Ltd..

Zenith's three-year grant acceleration

Zenith Oilfield Technology Limited shows 1 grants in 2022–2024 against only 2 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.

Zapgo

10
Zeality

10
Zeco

10
Zedsen

10
Zenith Products

10
Zetagen Therapeut…

10
Zhangjiagang SMK…

10
Zhejiang Guyuehu…

10
Zenith Oilfield T… ◀

10

What this shows Zenith holds 10 patents at rank #27,899, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Zenith

By rank, the assignees closest to #27,899 in granted patent volume.

Leaders in E21B (Earth OR Rock Drilling)

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

Zenith's Innovation Score vs. every tracked assignee

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

34 45th percentile higher than 45% 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 · 2016–2023

Grants by year

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

View data table

Zenith Oilfield Technology Limited patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2016	1	10.0%
2017	2	20.0%
2018	4	40.0%
2019	1	10.0%
2021	1	10.0%
2023	1	10.0%

Which technologies does Zenith Oilfield Technology Limited patent most?

E21B - Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells 9

H04B - Transmission 3

G01V - GEOPHYSICS; Gravitational MEASUREMENTS; Detecting Masses OR OBJECTS; Tags 2

G01L - Measuring Force, Stress, Torque, Work, Mechanical Power, Mechanical Efficiency, OR Fluid Pressure 2

G01D - Measuring NOT Specially Adapted FOR A Specific VARIABLE; Arrangements FOR Measuring TWO OR More Variables NOT Covered IN A Single Other SUBCLASS; Tariff Metering APPARATUS; Measuring OR Testing NOT Otherwise Provided FOR 2

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

G01R - Measuring Electric VARIABLES; Measuring Magnetic Variables 1

H02K - Dynamo-electric Machines 1

Top 8 of 8 technology areas

Where it ranks

Overall rank by patents

#27,893

of 49,997 tracked assignees

Innovation Score

33.7 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

What to do with this data

Zenith Oilfield Technology Limited's patent record in context - here's where to go next.

Zenith Oilfield Technology Limited'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), 90% of its portfolio - see every assignee active in that class. Explore E21B
Ranked #27,893 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Zenith Oilfield Technology Limited against ZapGo Ltd, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 33.7/100 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.