Where does Tamagawa Seiki Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Tamagawa Seiki Co., Ltd. ranks #33,529 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 Tamagawa Seiki Co., Ltd. hold?

Tamagawa Seiki Co., Ltd. holds 8 US utility patents granted between 2015 and 2025, spanning 11 technology areas.

What is Tamagawa Seiki Co., Ltd.'s Innovation Score?

Tamagawa Seiki Co., Ltd. has an Innovation Score of 44.8 out of 100 (top 25% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Tamagawa Seiki Co., Ltd.'s patent grant rate increasing or decreasing?

Tamagawa Seiki Co., Ltd.'s recent grant velocity is -25% 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 Tamagawa Seiki Co., Ltd.'s patents?

Tamagawa Seiki Co., Ltd.'s patents average 9.1 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 Tamagawa Seiki 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

Tamagawa Seiki Co., Ltd.

Q: What technology areas does Tamagawa Seiki Co., Ltd. focus on?

Tamagawa Seiki Co., Ltd.'s top technology area is 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) with 3 patents, ranking #367 of 1,381 assignees active in that subclass. Grants appear in 11 CPC subclasses total.

USPTO PatentsView assignee record - 8 granted patents across 11 technology areas, recorded in grant years 2015–2025. 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: 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 OT).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Tamagawa ranks #33,529 of 49,997 tracked US assignees by granted-patent volume, with 8 patents across 11 technology areas.

#33,529
of 49,997 US assignees by volume: Top 25%
by Innovation Score (44.8/100): 9.1
avg claims per patent: -25%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R33529 · Foreign Corporation #33,529 · 8 grants

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

GRANTS-MICRO 8 grants
MID-PACK #33,529/49,997
PHOTO-FINISH Taidoc Technology
CPC-FOCUS G01D · 11 areas
INNOV-PAR 44.8/100
CLAIMS-PAR 9.1 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DOWN -25% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Taidoc Technology Corporation (±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 Tamagawa’s 44.8 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 (17%) Velocity 20.0 pts (45%) Breadth 11.7 pts (26%) Claim depth 5.5 pts (12%)

Qualcomm Incorporated · highest

85
Tamagawa Seiki · this assignee

45
3D Lighting… · lowest

7

What this shows Tamagawa's Innovation Score is 44.8/100 (top 25% 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 Tamagawa?

Each dot is one of Tamagawa’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). Tamagawa’s own 9.1 claims/patent is at or below the 11.3 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

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

Where Tamagawa's grants concentrate

Tamagawa Seiki Co., Ltd. is a focused PatentsView assignee: 11 CPC subclasses with 37.5% of grants classified under 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 OT). Peak complete grant year is 2022 (2 grants) versus a trough of 1 in 2015. By volume, Tamagawa sits between Taidoc Technology Corporation and Target Systemelektronik GMBH &CO. KG.

Tamagawa's three-year grant acceleration

Tamagawa Seiki Co., Ltd. shows 3 grants in 2022–2024 against only 0 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.

Taidoc Technology

8
Taiflex Scientific

8
Taiwan Chelic

8
Taiwan Shan YIN I…

8
Tanazawa Hakkosha

8
Tang Chou Industr…

8
Tapematic S P A

8
Target Systemelek…

8
Tamagawa Seiki ◀

8

What this shows Tamagawa holds 8 patents at rank #33,507, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Tamagawa

By rank, the assignees closest to #33,507 in granted patent volume.

Leaders in G01D (Measuring NOT Specially Adapted FOR A Specific Variable)

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

Tamagawa's Innovation Score vs. every tracked assignee

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

45 Top 25% higher than 75% 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 · 2015–2025

Grants by year

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

View data table

Tamagawa Seiki Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	1	12.5%
2016	1	12.5%
2017	1	12.5%
2018	1	12.5%
2022	2	25.0%
2024	1	12.5%
2025partial year	1	12.5%

Which technologies does Tamagawa Seiki Co., Ltd. patent most?

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 3

H01R - Electrically-conductive CONNECTIONS; Structural Associations OF A Plurality OF Mutually-insulated Electrical Connecting ELEMENTS; Coupling DEVICES; Current Collectors 2

H02K - Dynamo-electric Machines 2

G06F - Electric Digital Data Processing 2

H03M - CODING; DECODING; Code Conversion IN General 2

H02P - Control OR Regulation OF Electric Motors, Electric Generators OR Dynamo-electric CONVERTERS; Controlling Transformers, Reactors OR Choke Coils 2

G01R - Measuring Electric VARIABLES; Measuring Magnetic Variables 1

G01P - Measuring Linear OR Angular Speed, Acceleration, Deceleration, OR SHOCK; Indicating Presence, Absence, OR Direction, OF Movement 1

B23K - Soldering OR UNSOLDERING; WELDING; Cladding OR Plating BY Soldering OR WELDING; Cutting BY Applying Heat Locally, e.g. Flame CUTTING; Working BY Laser Beam 1

G01B - Measuring Length, Thickness OR Similar Linear DIMENSIONS; Measuring ANGLES; Measuring AREAS; Measuring Irregularities OF Surfaces OR Contours 1

H02J - Circuit Arrangements OR Systems FOR Supplying OR Distributing Electric POWER; Systems FOR Storing Electric Energy 1

Top 11 of 11 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

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

Tamagawa Seiki Co., Ltd.'s lead technology class is 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 OT), 37.5% of its portfolio - see every assignee active in that class. Explore G01D
Ranked #33,529 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Tamagawa Seiki Co., Ltd. against Taidoc Technology Corporation, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 44.8/100 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.