Where does Sekisui Plastics Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Sekisui Plastics Co., Ltd. ranks #4,913 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 Sekisui Plastics Co., Ltd. hold?

Sekisui Plastics Co., Ltd. holds 71 US utility patents granted between 2015 and 2025, spanning 45 technology areas.

What is Sekisui Plastics Co., Ltd.'s Innovation Score?

Sekisui Plastics Co., Ltd. has an Innovation Score of 48.5 out of 100 (top 16% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Sekisui Plastics Co., Ltd.'s patent grant rate increasing or decreasing?

Sekisui Plastics Co., Ltd.'s recent grant velocity is -16% 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 Sekisui Plastics Co., Ltd.'s patents?

Sekisui Plastics Co., Ltd.'s patents average 12.1 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 Sekisui Plastics 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

Sekisui Plastics Co., Ltd.

Q: What technology areas does Sekisui Plastics Co., Ltd. focus on?

Sekisui Plastics Co., Ltd.'s top technology area is C08J (WORKING-UP; General Processes OF COMPOUNDING; After-treatment NOT Covered BY Subclasses C08b, C08c, C08f, C08g or C08h) with 39 patents. Grants appear in 45 CPC subclasses total.

USPTO PatentsView assignee record - 71 granted patents across 45 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: C08J (WORKING-UP; General Processes OF COMPOUNDING; After-treatment NOT Covered BY Subclasses C08b, C08c, C08f, C08g or C08h).

Compiled by PlainPatent · May 15, 2026

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Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, Sekisui ranks #4,913 of 49,997 tracked US assignees by granted-patent volume, with 71 patents across 45 technology areas.

#4,913
of 49,997 US assignees by volume: Top 16%
by Innovation Score (48.5/100): 12.1
avg claims per patent: -16%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R4913 · Foreign Corporation #4,913 · 71 grants

GRANTS-SMALL · TOP-DECILE · PHOTO-FINISH · CPC-WIDE · INNOV-PAR · CLAIMS-RICH · TYPE-FRNCORP · VEL-DOWN · BOOK-FULL

GRANTS-SMALL 71 grants
TOP-DECILE #4,913/49,997
PHOTO-FINISH Proxense
CPC-WIDE C08J · 45 areas
INNOV-PAR 48.5/100
CLAIMS-RICH 12.1 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DOWN -16% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Proxense, LLC (±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.

Qualcomm Incorporated · highest

85
Menicon · near

49
Mitsubishi Heavy… · near

49
Paul Wurth · near

49
Salk Institute for… · near

49
Sekisui Plastics · this assignee

49
3D Lighting… · lowest

7

What this shows Sekisui's Innovation Score is 48.5/100 (top 16% 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.

Where Sekisui's grants concentrate

Sekisui Plastics Co., Ltd. is a focused PatentsView assignee: 45 CPC subclasses with 54.9% of grants classified under C08J (WORKING-UP; General Processes OF COMPOUNDING; After-treatment NOT Covered BY Subclasses C08b, C08c, C08f, C08g or C08h). Peak complete grant year is 2018 (11 grants) versus a trough of 2 in 2024. By volume, Sekisui sits between Proxense, LLC and Sichuan Qianli-beoka Medical Technology Inc..

Sekisui's three-year grant acceleration

From 2019–2021 to 2022–2024, Sekisui Plastics Co., Ltd. moved from 29 to 12 grants (0.41x the prior three-year total, a multiple, not a CAGR). See the growth leaderboard.

Proxense

71
Pukyong National…

71
Satake

71
Seattle Genetics

71
SR

71
Staubli Faverges

71
Schul Internation…

71
Sichuan Qianli-be…

71
Sekisui Plastics ◀

71

What this shows Sekisui holds 71 patents at rank #4,912, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Sekisui

By rank, the assignees closest to #4,912 in granted patent volume.

Leaders in C08J (Working-up)

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

Assignees with similar portfolio profiles

Two PlainPatent-derived peer sets for Sekisui, neither rank-band nor same-CPC leaders (those blocks stay above).

Similar innovation score

Nearest assignees by Innovation Score (49 here).

Paul Wurth S.A. 49 Menicon Co., Ltd. 49 Salk Institute for Biological Studies 49 Mitsubishi Heavy Industries Engineering, Ltd. 49

Similar claim depth

Nearest assignees by average claims per patent (12.1 here).

Nissha Co., Ltd. 12.1 avg Rheinmetall Waffe Munition GmbH 12.1 avg Nanolumens Acquisition, Inc. 12.1 avg Kyushu University 12.1 avg

Sekisui's Innovation Score vs. every tracked assignee

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

49 Top 16% higher than 84% 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

Sekisui Plastics Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	10	14.1%
2016	3	4.2%
2017	3	4.2%
2018	11	15.5%
2019	10	14.1%
2020	8	11.3%
2021	11	15.5%
2022	5	7.0%
2023	5	7.0%
2024	2	2.8%
2025partial year	3	4.2%

Which technologies does Sekisui Plastics Co., Ltd. patent most?

C08J - WORKING-UP; General Processes OF COMPOUNDING; After-treatment NOT Covered BY Subclasses C08b, C08c, C08f, C08g or C08h 39

C08F - Macromolecular Compounds Obtained BY Reactions Only Involving Carbon-to-carbon Unsaturated Bonds 27

C08L - Compositions OF Macromolecular Compounds 22

C09D - Coating Compositions, e.g. Paints, Varnishes OR LACQUERS; Filling PASTES; Chemical Paint OR INK REMOVERS; INKS; Correcting FLUIDS; WOODSTAINS; Pastes OR Solids FOR Colouring OR PRINTING; USE OF Materials Therefor 18

B29C - Shaping OR Joining OF PLASTICS; Shaping OF Material IN A Plastic State, NOT Otherwise Provided FOR; After-treatment OF THE Shaped Products, e.g. Repairing 15

B32B - Layered Products, i.e. Products Built-up OF Strata OF Flat OR Non-flat, e.g. Cellular OR Honeycomb, Form 13

A61Q - Specific USE OF Cosmetics OR Similar Toiletry Preparations 12

A61K - Preparations FOR Medical, Dental OR Toiletry Purposes 12

G02B - Optical Elements, Systems OR Apparatus 12

B29K - Indexing Scheme Associated With Subclasses B29b, B29c OR B29d, Relating TO Moulding Materials OR TO Materials FOR ; Moulds, ; Reinforcements, Fillers OR Preformed Parts, e.g. Inserts 11

C08K - Use of inorganic or non-macromolecular organic substances as compounding ingredients 11

Y10T - Technical Subjects Covered BY Former US Classification 11

C08G - Macromolecular Compounds Obtained Otherwise Than BY Reactions Only Involving Unsaturated Carbon-to-carbon Bonds 11

B60N - Seats Specially Adapted FOR VEHICLES; Vehicle Passenger Accommodation NOT Otherwise Provided FOR 10

B29L - Indexing Scheme Associated With Subclass B29c, Relating TO Particular Articles 10

Top 15 of 45 technology areas

Where it ranks

Overall rank by patents

#4,913

of 49,997 tracked assignees

Innovation Score

48.5 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

What to do with this data

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

Sekisui Plastics Co., Ltd.'s lead technology class is C08J (WORKING-UP; General Processes OF COMPOUNDING; After-treatment NOT Covered BY Subclasses C08b, C08c, C08f, C08g or C08h), 54.9% of its portfolio - see every assignee active in that class. Explore C08J
Ranked #4,913 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Sekisui Plastics Co., Ltd. against Proxense, LLC, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 48.5/100 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.