Where does Maruo Calcium Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Maruo Calcium Co., Ltd. ranks #32,434 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 Maruo Calcium Co., Ltd. hold?

Maruo Calcium Co., Ltd. holds 8 US utility patents granted between 2015 and 2021, spanning 13 technology areas.

What is Maruo Calcium Co., Ltd.'s Innovation Score?

Maruo Calcium Co., Ltd. has an Innovation Score of 26.6 out of 100 (21st percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Maruo Calcium Co., Ltd. focus on?

Maruo Calcium Co., Ltd.'s top technology area is C08K (Use of inorganic or non-macromolecular organic substances as compounding ingredients) with 8 patents, ranking #392 of 1,963 assignees active in that subclass. Grants appear in 13 CPC subclasses total.

Is Maruo Calcium Co., Ltd.'s patent grant rate increasing or decreasing?

Maruo Calcium Co., Ltd.'s recent grant velocity is -86% 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 Maruo Calcium Co., Ltd.'s patents?

Maruo Calcium Co., Ltd.'s patents average 10.4 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 Maruo Calcium Co., Ltd. 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

Maruo Calcium Co., Ltd.

USPTO PatentsView assignee record - 8 granted patents across 13 technology areas, recorded in grant years 2015–2021. 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: C08K (Use of inorganic or non-macromolecular organic substances as compounding ingredients).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Maruo ranks #32,434 of 49,997 tracked US assignees by granted-patent volume, with 8 patents across 13 technology areas.

#32,434
of 49,997 US assignees by volume: 21st percentile
by Innovation Score (26.6/100): 10.4
avg claims per patent: -86%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R32434 · Foreign Corporation #32,434 · 8 grants

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

GRANTS-MICRO 8 grants
MID-PACK #32,434/49,997
PHOTO-FINISH Mannington Mills
CPC-FOCUS C08K · 13 areas
INNOV-THIN 26.6/100
CLAIMS-PAR 10.4 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DROP -86% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Mannington Mills, Inc. (±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 Maruo’s 26.6 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 7.6 pts (29%) Velocity 0.0 pts (0%) Breadth 12.7 pts (48%) Claim depth 6.2 pts (23%)

Qualcomm Incorporated · highest

85
Maruo Calcium · this assignee

27
3D Lighting… · lowest

7

What this shows Maruo's Innovation Score is 26.6/100 (21st 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 Maruo?

Each dot is one of Maruo’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). Maruo’s own 10.4 claims/patent is at or below the 13.3 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

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

Where Maruo's grants concentrate

Maruo Calcium Co., Ltd. is a focused PatentsView assignee: 13 CPC subclasses with 100% of grants classified under C08K (Use of inorganic or non-macromolecular organic substances as compounding ingredients). Peak complete grant year is 2015 (2 grants) versus a trough of 1 in 2016. By volume, Maruo sits between Mannington Mills, Inc. and Material Girl Inc.

Mannington Mills

8
Marantec Antriebs…

8
Maritime Telecomm…

8
Marshall Electric

8
Marvis Interventi…

8
Maschinenfabrik K…

8
Mate

8
Material Girl

8
Maruo Calcium ◀

8

What this shows Maruo holds 8 patents at rank #32,405, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Maruo

By rank, the assignees closest to #32,405 in granted patent volume.

Leaders in C08K (Use of inorganic or non-macromolecular organic substances…)

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

Maruo's Innovation Score vs. every tracked assignee

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

27 21st percentile higher than 21% 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 · 2015–2021

Grants by year

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

View data table

Maruo Calcium Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	2	25.0%
2016	1	12.5%
2017	2	25.0%
2018	1	12.5%
2019	1	12.5%
2021	1	12.5%

Which technologies does Maruo Calcium Co., Ltd. patent most?

C08K - Use of inorganic or non-macromolecular organic substances as compounding ingredients 8

C01P - Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds 6

C09C - Treatment OF Inorganic Materials, Other Than Fibrous Fillers, TO Enhance Their Pigmenting OR Filling Properties ; Preparation OF Carbon Black ; ; Preparation OF Inorganic Materials Which ARE NO Single Chemical Compounds AND Which ARE Mainly Used AS Pigments OR Fillers 6

C01F - Compounds OF THE Metals Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium, OR OF THE Rare-earth Metals 5

C08L - Compositions OF Macromolecular Compounds 5

Y10T - Technical Subjects Covered BY Former US Classification 3

C09J - ADHESIVES; Non-mechanical Aspects OF Adhesive Processes IN GENERAL; Adhesive Processes NOT Provided FOR ELSEWHERE; USE OF Materials AS Adhesives 3

C09K - Materials FOR Miscellaneous Applications, NOT Provided FOR Elsewhere 2

C08G - Macromolecular Compounds Obtained Otherwise Than BY Reactions Only Involving Unsaturated Carbon-to-carbon Bonds 1

G02B - Optical Elements, Systems OR Apparatus 1

F21V - Functional Features OR Details OF Lighting Devices OR Systems THEREOF; Structural Combinations OF Lighting Devices With Other Articles, NOT Otherwise Provided FOR 1

B05D - Processes FOR Applying Fluent Materials TO Surfaces, IN General 1

C08J - WORKING-UP; General Processes OF COMPOUNDING; After-treatment NOT Covered BY Subclasses C08b, C08c, C08f, C08g or C08h 1

Top 13 of 13 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

Maruo Calcium Co., Ltd.'s patent record in context - here's where to go next.

Maruo Calcium Co., Ltd.'s lead technology class is C08K (Use of inorganic or non-macromolecular organic substances as compounding ingredients), 100% of its portfolio - see every assignee active in that class. Explore C08K
Ranked #32,434 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Maruo Calcium Co., Ltd. against Mannington Mills, Inc., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 26.6/100 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.