Where does Yamaguchi Seiken Kogyo Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Yamaguchi Seiken Kogyo Co., Ltd. ranks #30,650 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 Yamaguchi Seiken Kogyo Co., Ltd. hold?

Yamaguchi Seiken Kogyo Co., Ltd. holds 9 US utility patents granted between 2018 and 2020, spanning 9 technology areas.

What is Yamaguchi Seiken Kogyo Co., Ltd.'s Innovation Score?

Yamaguchi Seiken Kogyo Co., Ltd. has an Innovation Score of 23.9 out of 100 (13th 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 Yamaguchi Seiken Kogyo Co., Ltd. focus on?

Yamaguchi Seiken Kogyo Co., Ltd.'s top technology area is G11B (Information Storage Based ON Relative Movement Between Record Carrier AND Transducer) with 8 patents, ranking #191 of 933 assignees active in that subclass. Grants appear in 9 CPC subclasses total.

Is Yamaguchi Seiken Kogyo Co., Ltd.'s patent grant rate increasing or decreasing?

Yamaguchi Seiken Kogyo Co., Ltd.'s recent grant velocity is +25% 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 Yamaguchi Seiken Kogyo Co., Ltd.'s patents?

Yamaguchi Seiken Kogyo Co., Ltd.'s patents average 8.9 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 Yamaguchi Seiken Kogyo 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

Yamaguchi Seiken Kogyo Co., Ltd.

USPTO PatentsView assignee record - 9 granted patents across 9 technology areas, recorded in grant years 2018–2020. 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: G11B (Information Storage Based ON Relative Movement Between Record Carrier AND Transducer).

Compiled by PlainPatent · May 15, 2026

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Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, Yamaguchi ranks #30,650 of 49,997 tracked US assignees by granted-patent volume, with 9 patents across 9 technology areas.

#30,650
of 49,997 US assignees by volume: 13th percentile
by Innovation Score (23.9/100): 8.9
avg claims per patent: +25%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R30650 · Foreign Corporation #30,650 · 9 grants

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

GRANTS-MICRO 9 grants
MID-PACK #30,650/49,997
PHOTO-FINISH Xuchang Longqi…
CPC-NARROW G11B · 9 areas
INNOV-THIN 23.9/100
CLAIMS-PAR 8.9 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-UP +25% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Xuchang Longqi Electronic Commerce Co., 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 Yamaguchi’s 23.9 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 8.0 pts (33%) Velocity 0.0 pts (0%) Breadth 10.6 pts (44%) Claim depth 5.3 pts (22%)

Qualcomm Incorporated · highest

85
Yamaguchi Seiken Kogyo · this assignee

24
3D Lighting… · lowest

7

What this shows Yamaguchi's Innovation Score is 23.9/100 (13th 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 Yamaguchi?

Each dot is one of Yamaguchi’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). Yamaguchi’s own 8.9 claims/patent is ABOVE the 5.8 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where Yamaguchi's grants concentrate

Yamaguchi Seiken Kogyo Co., Ltd. is a focused PatentsView assignee: 9 CPC subclasses with 88.9% of grants classified under G11B (Information Storage Based ON Relative Movement Between Record Carrier AND Transducer). Peak complete grant year is 2020 (5 grants) versus a trough of 2 in 2018. By volume, Yamaguchi sits between Xuchang Longqi Electronic Commerce Co., Ltd. and Yoto Limited.

Xuchang Longqi Co…

9
Xybix Systems

9
Y Jacobs Medical

9
Yamada

9
Yantai Ausbio Lab…

9
Yeil

9
Yoox Net-a-porter…

9
Yoto

9
Yamaguchi Seiken… ◀

9

What this shows Yamaguchi holds 9 patents at rank #30,619, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Yamaguchi

By rank, the assignees closest to #30,619 in granted patent volume.

Leaders in G11B (Information Storage Based ON Relative Movement Between Re…)

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

Yamaguchi's Innovation Score vs. every tracked assignee

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

24 13th percentile higher than 13% 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 · 2018–2020

Grants by year

Teal-shaded recent years (2020–present) versus the 2018–2019 baseline. Full figures in the table below.

View data table

Yamaguchi Seiken Kogyo Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2018	2	22.2%
2019	2	22.2%
2020	5	55.6%

Which technologies does Yamaguchi Seiken Kogyo Co., Ltd. patent most?

G11B - Information Storage Based ON Relative Movement Between Record Carrier AND Transducer 8

C09G - Polishing Compositions ; SKI Waxes 8

C09K - Materials FOR Miscellaneous Applications, NOT Provided FOR Elsewhere 6

B24B - Machines, Devices, OR Processes FOR Grinding OR Polishing ; Dressing OR Conditioning OF Abrading SURFACES; Feeding OF Grinding, Polishing, OR Lapping Agents 4

C08F - Macromolecular Compounds Obtained BY Reactions Only Involving Carbon-to-carbon Unsaturated Bonds 3

C01B - Non-metallic ELEMENTS; Compounds THEREOF; ; Metalloids OR Compounds Thereof NOT Covered BY Subclass C01c 3

C08K - Use of inorganic or non-macromolecular organic substances as compounding ingredients 2

C01P - Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds 2

H01L - Semiconductor Devices NOT Covered BY Class H10 1

Top 9 of 9 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

Yamaguchi Seiken Kogyo Co., Ltd.'s patent record in context - here's where to go next.

Yamaguchi Seiken Kogyo Co., Ltd.'s lead technology class is G11B (Information Storage Based ON Relative Movement Between Record Carrier AND Transducer), 88.9% of its portfolio - see every assignee active in that class. Explore G11B
Ranked #30,650 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Yamaguchi Seiken Kogyo Co., Ltd. against Xuchang Longqi Electronic Commerce Co., Ltd., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 23.9/100 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.