Where does Bunka Shutter Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Bunka Shutter Co., Ltd. ranks #45,388 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 Bunka Shutter Co., Ltd. hold?

Bunka Shutter Co., Ltd. holds 5 US utility patents granted between 2017 and 2025, spanning 6 technology areas.

What is Bunka Shutter Co., Ltd.'s Innovation Score?

Bunka Shutter Co., Ltd. has an Innovation Score of 34.9 out of 100 (49th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Bunka Shutter Co., Ltd.'s patent grant rate increasing or decreasing?

Bunka Shutter Co., Ltd.'s recent grant velocity is +0% 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 Bunka Shutter Co., Ltd.'s patents?

Bunka Shutter Co., Ltd.'s patents average 11.2 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 Bunka Shutter 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

Bunka Shutter Co., Ltd.

Q: What technology areas does Bunka Shutter Co., Ltd. focus on?

Bunka Shutter Co., Ltd.'s top technology area is E06B (Fixed OR Movable Closures FOR Openings IN Buildings, Vehicles, Fences OR Like Enclosures IN General, e.g. Doors, Windows, Blinds, Gates) with 5 patents, ranking #167 of 637 assignees active in that subclass. Grants appear in 6 CPC subclasses total.

USPTO PatentsView assignee record - 5 granted patents across 6 technology areas, recorded in grant years 2017–2025. 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: E06B (Fixed OR Movable Closures FOR Openings IN Buildings, Vehicles, Fences OR Like Enclosures IN General, e.g. Doors, Windows, Blinds, Gates).

Compiled by PlainPatent · May 15, 2026

RSS updates for this company

Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, Bunka ranks #45,388 of 49,997 tracked US assignees by granted-patent volume, with 5 patents across 6 technology areas.

#45,388
of 49,997 US assignees by volume: 49th percentile
by Innovation Score (34.9/100): 11.2
avg claims per patent: +0%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R45388 · Foreign Corporation #45,388 · 5 grants

GRANTS-MICRO · BOTTOM-DECILE · PHOTO-FINISH · CPC-NARROW · INNOV-THIN · CLAIMS-PAR · TYPE-FRNCORP · VEL-FLAT · BOOK-FULL

GRANTS-MICRO 5 grants
BOTTOM-DECILE #45,388/49,997
PHOTO-FINISH Buffalo Memory
CPC-NARROW E06B · 6 areas
INNOV-THIN 34.9/100
CLAIMS-PAR 11.2 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-FLAT +0% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Buffalo Memory 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 Bunka’s 34.9 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 6.2 pts (18%) Velocity 13.3 pts (38%) Breadth 8.7 pts (25%) Claim depth 6.7 pts (19%)

Qualcomm Incorporated · highest

85
Bunka Shutter · this assignee

35
3D Lighting… · lowest

7

What this shows Bunka's Innovation Score is 34.9/100 (49th 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 Bunka?

Each dot is one of Bunka’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). Bunka’s own 11.2 claims/patent is at or below the 12.6 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

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

Where Bunka's grants concentrate

Bunka Shutter Co., Ltd. is a focused PatentsView assignee: 6 CPC subclasses with 100% of grants classified under E06B (Fixed OR Movable Closures FOR Openings IN Buildings, Vehicles, Fences OR Like Enclosures IN General, e.g. Doors, Windows, Blinds, Gates). By volume, Bunka sits between Buffalo Memory Co., Ltd. and BWA Water Additives UK Limited.

Bunka's three-year grant acceleration

Bunka Shutter Co., Ltd. shows 2 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.

Buffalo Memory

5
Bugcrowd

5
Buildscale

5
BULL

5
Burger King

5
Burgopak

5
Buzzinbees

5
BWA Water Additiv…

5
Bunka Shutter ◀

5

What this shows Bunka holds 5 patents at rank #45,211, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Bunka

By rank, the assignees closest to #45,211 in granted patent volume.

Leaders in E06B (Fixed OR Movable Closures FOR Openings IN Buildings)

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

Bunka's Innovation Score vs. every tracked assignee

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

35 49th percentile higher than 49% 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 · 2017–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2017–2019 baseline. Full figures in the table below.

View data table

Bunka Shutter Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2017	2	40.0%
2023	2	40.0%
2025partial year	1	20.0%

Which technologies does Bunka Shutter Co., Ltd. patent most?

E06B - Fixed OR Movable Closures FOR Openings IN Buildings, Vehicles, Fences OR Like Enclosures IN General, e.g. Doors, Windows, Blinds, Gates 5

E05B - LOCKS; Accessories THEREFOR; Handcuffs 2

E05Y - Indexing Scheme Associated With Subclasses E05d AND E05f, Relating TO Construction Elements, Electric Control, Power Supply, Power Signal OR Transmission, User Interfaces, Mounting OR Coupling, Details, Accessories, Auxiliary Operations NOT Otherwise Provided FOR, Application Thereof 2

A62C - Fire-fighting 1

F24F - AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR Currents FOR Screening 1

E05D - Hinges OR Suspension Devices FOR Doors, Windows OR Wings 1

Top 6 of 6 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

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

Bunka Shutter Co., Ltd.'s lead technology class is E06B (Fixed OR Movable Closures FOR Openings IN Buildings, Vehicles, Fences OR Like Enclosures IN General, e.g. Doors, Windows, Blinds, Gates), 100% of its portfolio - see every assignee active in that class. Explore E06B
Ranked #45,388 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Bunka Shutter Co., Ltd. against Buffalo Memory Co., Ltd., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 34.9/100 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.