Where does Castrol Limited rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Castrol Limited ranks #6,511 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 Castrol Limited hold?

Castrol Limited holds 51 US utility patents granted between 2015 and 2024, spanning 40 technology areas.

What is Castrol Limited's Innovation Score?

Castrol Limited has an Innovation Score of 50.3 out of 100 (top 13% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

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

Castrol Limited's recent grant velocity is +32% compared to the prior five-year period (grant years, not application filing dates). The company is maintaining or growing its granted-patent output.

What does claim depth mean for Castrol Limited's patents?

Castrol Limited's patents average 20.4 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 Castrol 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

Castrol Limited

Q: What technology areas does Castrol Limited focus on?

Castrol Limited's top technology area is F01M (Lubricating OF Machines OR Engines IN GENERAL; Lubricating Internal Combustion ENGINES; Crankcase Ventilating) with 23 patents, ranking #8 of 259 assignees active in that subclass. Grants appear in 40 CPC subclasses total.

USPTO PatentsView assignee record - 51 granted patents across 40 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: F01M (Lubricating OF Machines OR Engines IN GENERAL; Lubricating Internal Combustion ENGINES; Crankcase Ventilating).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Castrol ranks #6,511 of 49,997 tracked US assignees by granted-patent volume, with 51 patents across 40 technology areas.

#6,511
of 49,997 US assignees by volume: Top 13%
by Innovation Score (50.3/100): 20.4
avg claims per patent: +32%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R6511 · Foreign Corporation #6,511 · 51 grants

GRANTS-SMALL · UPPER-Q · PHOTO-FINISH · CPC-WIDE · INNOV-PAR · CLAIMS-DENSE · TYPE-FRNCORP · VEL-UP · BOOK-FULL

GRANTS-SMALL 51 grants
UPPER-Q #6,511/49,997
PHOTO-FINISH Cambium Networks
CPC-WIDE F01M · 40 areas
INNOV-PAR 50.3/100
CLAIMS-DENSE 20.4 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-UP +32% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Cambium Networks 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.

How Castrol’s 50.3 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 13.6 pts (27%) Velocity 2.1 pts (4%) Breadth 22.4 pts (45%) Claim depth 12.2 pts (24%)

Qualcomm Incorporated · highest

85
Castrol · this assignee

50
Cytokinetics · near

50
Inmar Clearing · near

50
Nautilus Hyosung… · near

50
Unverferth Manufactu… · near

50
3D Lighting… · lowest

7

What this shows Castrol's Innovation Score is 50.3/100 (top 13% 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 Castrol?

Each dot is one of Castrol’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). Castrol’s own 20.4 claims/patent is ABOVE the 13.2 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where Castrol's grants concentrate

Castrol Limited is a focused PatentsView assignee: 40 CPC subclasses with 45.1% of grants classified under F01M (Lubricating OF Machines OR Engines IN GENERAL; Lubricating Internal Combustion ENGINES; Crankcase Ventilating). Peak complete grant year is 2020 (13 grants) versus a trough of 2 in 2017. By volume, Castrol sits between Caregen Co., Ltd. and D&M Holdings Inc..

Castrol's three-year grant acceleration

From 2019–2021 to 2022–2024, Castrol Limited moved from 29 to 9 grants (0.31x the prior three-year total, a multiple, not a CAGR). See the growth leaderboard.

Caregen

51
Clover MFG

51
Cambium Networks

51
Card-monroe

51
Children's Hospit…

51
Corn Products Dev…

51
Cotapaxi Custom D…

51
D&M Holdings

51
Castrol ◀

51

What this shows Castrol holds 51 patents at rank #6,512, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Castrol

By rank, the assignees closest to #6,512 in granted patent volume.

Leaders in F01M (Lubricating OF Machines OR Engines IN General)

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

Assignees with similar portfolio profiles

Two PlainPatent-derived peer sets for Castrol, neither rank-band nor same-CPC leaders (those blocks stay above). In F01M (Lubricating OF Machines OR Engines IN General), Castrol ranks #8 of 259 assignees by patent count in that subclass.

Similar innovation score

Nearest assignees by Innovation Score (50 here).

Cytokinetics, Inc. 50 Unverferth Manufacturing Co., Inc. 50 Inmar Clearing, Inc. 50 Nautilus Hyosung America, Inc. 50

Similar claim depth

Nearest assignees by average claims per patent (20.4 here).

Entefy Inc. 20.4 avg Tekelec, Inc. 20.4 avg Core Wireless Licensing S.A.R.L. 20.4 avg Ablative Solutions, Inc. 20.4 avg

Castrol's Innovation Score vs. every tracked assignee

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

50 Top 13% higher than 87% 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

Castrol Limited patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	4	7.8%
2017	2	3.9%
2018	7	13.7%
2019	9	17.6%
2020	13	25.5%
2021	7	13.7%
2022	4	7.8%
2023	3	5.9%
2024	2	3.9%

Which technologies does Castrol Limited patent most?

F01M - Lubricating OF Machines OR Engines IN GENERAL; Lubricating Internal Combustion ENGINES; Crankcase Ventilating 23

C10M - Lubricating Compositions ; USE OF Chemical Substances Either Alone OR AS Lubricating Ingredients IN A Lubricating Composition 17

C10N - Indexing Scheme Associated With Subclass C10m Relating TO Lubricating Compositions 16

F16N - Lubricating 8

B65D - Containers FOR Storage OR Transport OF Articles OR Materials, e.g. Bags, Barrels, Bottles, Boxes, Cans, Cartons, Crates, Drums, Jars, Tanks, Hoppers, Forwarding CONTAINERS; Accessories, Closures, OR Fittings THEREFOR; Packaging ELEMENTS; Packages 6

C10L - Fuels NOT Otherwise Provided FOR; Natural GAS; Synthetic Natural GAS Obtained BY Processes NOT Covered BY Subclasses C10g OR C10K; Liquified Petroleum GAS; USE OF Additives TO Fuels OR FIRES; Fire-lighters 5

G01N - Investigating OR Analysing Materials BY Determining Their Chemical OR Physical Properties 4

B60S - Servicing, Cleaning, Repairing, Supporting, Lifting, OR Manoeuvring OF Vehicles, NOT Otherwise Provided FOR 3

F01P - Cooling OF Machines OR Engines IN GENERAL; Cooling OF Internal-combustion Engines 3

B60K - Arrangement OR Mounting OF Propulsion Units OR OF Transmissions IN VEHICLES; Arrangement OR Mounting OF Plural Diverse Prime-movers IN VEHICLES; Auxiliary Drives FOR VEHICLES; Instrumentation OR Dashboards FOR VEHICLES; Arrangements IN Connection With Cooling, AIR Intake, GAS Exhaust OR Fuel Supply 2

B60T - Vehicle Brake Control Systems OR Parts THEREOF; Brake Control Systems OR Parts Thereof, IN General ; Arrangement OF Braking Elements ON Vehicles IN GENERAL; Portable Devices FOR Preventing Unwanted Movement OF VEHICLES; Vehicle Modifications TO Facilitate Cooling OF Brakes 2

F28D - Heat-exchange Apparatus, NOT Provided FOR IN Another Subclass, IN Which THE Heat-exchange Media DO NOT Come Into Direct Contact 2

Y02E - Reduction OF Greenhouse GAS [GHG] Emissions, Related TO Energy Generation, Transmission OR Distribution 2

B01D - Separation 2

B60R - Vehicles, Vehicle Fittings, OR Vehicle Parts, NOT Otherwise Provided FOR 2

Top 15 of 40 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

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

Castrol Limited's lead technology class is F01M (Lubricating OF Machines OR Engines IN GENERAL; Lubricating Internal Combustion ENGINES; Crankcase Ventilating), 45.1% of its portfolio - see every assignee active in that class. Explore F01M
Ranked #6,511 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Castrol Limited against Caregen Co., Ltd., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 50.3/100 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.