Where does Petrowell Limited rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Petrowell Limited ranks #14,203 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 Petrowell Limited hold?

Petrowell Limited holds 21 US utility patents granted between 2015 and 2018, spanning 6 technology areas.

What is Petrowell Limited's Innovation Score?

Petrowell Limited has an Innovation Score of 34.3 out of 100 (47th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Petrowell Limited's patent grant rate increasing or decreasing?

Petrowell Limited's recent grant velocity is -100% 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 Petrowell Limited's patents?

Petrowell Limited's patents average 29.5 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 Petrowell 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

Petrowell Limited

Q: What technology areas does Petrowell Limited focus on?

Petrowell 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 21 patents, ranking #170 of 1,363 assignees active in that subclass. Grants appear in 6 CPC subclasses total.

USPTO PatentsView assignee record - 21 granted patents across 6 technology areas, recorded in grant years 2015–2018. 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, Petrowell ranks #14,203 of 49,997 tracked US assignees by granted-patent volume, with 21 patents across 6 technology areas.

#14,203
of 49,997 US assignees by volume: 47th percentile
by Innovation Score (34.3/100): 29.5
avg claims per patent: -100%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R14203 · Foreign Corporation #14,203 · 21 grants

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

GRANTS-SMALL 21 grants
MID-PACK #14,203/49,997
PHOTO-FINISH Packaging of America
CPC-NARROW E21B · 6 areas
INNOV-THIN 34.3/100
CLAIMS-DENSE 29.5 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DROP -100% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Packaging Corporation of America (±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 Petrowell’s 34.3 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 10.7 pts (31%) Velocity 0.0 pts (0%) Breadth 8.7 pts (25%) Claim depth 15.0 pts (44%)

Qualcomm Incorporated · highest

85
Petrowell · this assignee

34
3D Lighting… · lowest

7

What this shows Petrowell's Innovation Score is 34.3/100 (47th 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 Petrowell?

Each dot is one of Petrowell’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). Petrowell’s own 29.5 claims/patent is ABOVE the 14.0 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where Petrowell's grants concentrate

Petrowell Limited is a focused PatentsView assignee: 6 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 2015 (9 grants) versus a trough of 2 in 2018. By volume, Petrowell sits between Powercell Sweden AB and Piramal Glass—USA, Inc..

Powercell Sweden…

21
Prime Polymer

21
Pulmocide

21
Packaging of Amer…

21
Phibro Animal Hea…

21
Physiowave

21
Piaggio Fast Forw…

21
Piramal Glass—USA

21
Petrowell ◀

21

What this shows Petrowell holds 21 patents at rank #14,204, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Petrowell

By rank, the assignees closest to #14,204 in granted patent volume.

Leaders in E21B (Earth OR Rock Drilling)

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

Petrowell's Innovation Score vs. every tracked assignee

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

34 47th percentile higher than 47% 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 · 2015–2018

Grants by year

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

View data table

Petrowell Limited patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	9	42.9%
2016	4	19.0%
2017	6	28.6%
2018	2	9.5%

Which technologies does Petrowell Limited patent most?

E21B - Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells 21

G01V - GEOPHYSICS; Gravitational MEASUREMENTS; Detecting Masses OR OBJECTS; Tags 3

H01H - Electric SWITCHES; RELAYS; SELECTORS; Emergency Protective Devices 2

Y10T - Technical Subjects Covered BY Former US Classification 2

F16L - PIPES; Joints OR Fittings FOR PIPES; Supports FOR Pipes, Cables OR Protective TUBING; Means FOR Thermal Insulation IN General 1

F16K - VALVES; TAPS; COCKS; ACTUATING-FLOATS; Devices FOR Venting OR Aerating 1

Top 6 of 6 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

Petrowell Limited's patent record in context - here's where to go next.

Petrowell 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), 100% of its portfolio - see every assignee active in that class. Explore E21B
Ranked #14,203 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Petrowell Limited against Powercell Sweden AB, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 34.3/100 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.