USPTO 2015–2025 USPTO PatentsView Foreign Corporation

Duraflex Hong Kong Limited

USPTO PatentsView assignee record - 90 granted patents across 22 technology areas, active 2016–2025. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: A44B (BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE).

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

Explore the portfolio See the ranking

Total patents granted

CPC technology areas

6.0

Avg claims per patent

+110%

5-year filing velocity

The verdict

Duraflex holds 90 US patents across 22 technology areas, rank #4,004 of 50,000 tracked assignees.

#4,004
of 50,000 US assignees by volume: Top 38%
by Innovation Score (39.5/100): 6.0
avg claims per patent: +110%
filing velocity, last 5 yrs

Portfolio overview

Duraflex Hong Kong Limited has been granted 90 US utility patents between 2016 and 2025, placing Duraflex Hong Kong Limited at rank #4,004 across all assignees tracked by PlainPatent. This portfolio spans 22 distinct Cooperative Patent Classification (CPC) subclasses, averaging 6.0 claims per patent with primary concentration in A44B (BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE). As a Foreign Corporation, Duraflex Hong Kong Limited is one of the more focused assignees in the PatentsView dataset. By volume, Duraflex sits between CNPC USA Corporation (90 patents, rank #4,000) and Hodogaya Chemical Co., Ltd. (90 patents, rank #4,008) - the closest US assignees by grant volume. The composite Innovation Score of 39.5/100 blends portfolio volume, filing velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.

Filing cadence tells the strategic story. Between 2020 and 2025 the company received 61 grants, compared with 29 in the 2015–2019 window, a +110% shift in five-year velocity. An acceleration of this magnitude signals aggressive R&D investment and expanding technical ambition. The Foreign Corporation classification further shapes interpretation, since corporate, government, and individual filers pursue patents for materially different reasons.

Claim depth and technology breadth together indicate competitive posture. Duraflex Hong Kong Limited's 6.0 average claims per patent suggests focused, narrowly drawn claims typical of single-invention filings, while a multi-domain presence across 22 subclasses balances depth with breadth. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark Duraflex Hong Kong Limited against peers pursuing similar technology classes.

CNPC USA

90
Camco Manufacturi…

90
Compass Therapeut…

90
Dicastal North Am…

90
Ecole Superieure…

90
Egis Technology

90
Federal-mogul Mot…

90
Hodogaya Chemical

90
Duraflex Hong Kong ◀

90

What this shows Duraflex holds 90 patents at rank #4,004, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Duraflex

By rank, the assignees closest to #4,004 in granted patent volume.

Leaders in A44B (Buttons)

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

Duraflex's Innovation Score vs. every tracked assignee

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

39 Top 38% higher than 62% of 50,000 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 · 2016–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2016–2019 baseline. Full figures in the table below.

View data table

Duraflex Hong Kong Limited patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2016	9	10.0%
2017	3	3.3%
2018	8	8.9%
2019	9	10.0%
2020	17	18.9%
2021	15	16.7%
2022	7	7.8%
2023	8	8.9%
2024	8	8.9%
2025	6	6.7%

Which technologies does Duraflex Hong Kong Limited patent most?

A44B - BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE 40

A44D - INDEXING SCHEME RELATING TO BUTTONS, PINS, BUCKLES OR SLIDE FASTENERS, AND TO JEWELLERY, BRACELETS OR OTHER PERSONAL ADORNMENTS 12

Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION 10

F16G - BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR 10

A41D - OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES 4

A45C - PURSES; LUGGAGE; HAND CARRIED BAGS 3

A45F - TRAVELLING OR CAMP EQUIPMENT: SACKS OR PACKS CARRIED ON THE BODY 3

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 3

B29L - INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES 3

A41F - GARMENT FASTENINGS; SUSPENDERS 3

G10K - SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR 2

F16B - DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING 2

H01R - ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS 1

B29D - PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE 1

B23P - METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS 1

Top 15 of 22 technology areas

Patent Moat Analysis

Portfolio Volume Light

Tech Breadth Multi-domain

Claim Depth Simple

Velocity Accelerating

Where it ranks

Overall rank by patents

#4,004

Across all tracked assignees

Innovation Score

39.5 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

Frequently Asked Questions

How many patents does Duraflex Hong Kong Limited hold?

Duraflex Hong Kong Limited holds 90 US granted patents filed between 2016 and 2025, spanning 22 technology areas.

What is Duraflex Hong Kong Limited's Innovation Score?

Duraflex Hong Kong Limited has an Innovation Score of 39.5 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Duraflex Hong Kong Limited focus on?

Duraflex Hong Kong Limited's top technology area is A44B (BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE) with 40 patents. The company has filed patents in 22 CPC subclasses total.

Is Duraflex Hong Kong Limited's patent filing rate increasing or decreasing?

Duraflex Hong Kong Limited's recent filing velocity is +110% compared to the prior five-year period. This indicates accelerating innovation.

What does claim depth mean for Duraflex Hong Kong Limited's patents?

Duraflex Hong Kong Limited's patents average 6.0 claims each. This is relatively simple claim structure, typical for focused inventions.

How is the Duraflex Hong Kong Limited 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.

How to use this portfolio

Duraflex's 90 grants land it in the top 38% by Innovation Score, but volume alone doesn't tell you where the strength sits.

Read that count against the largest US assignees before treating it as dominance - Duraflex ranks #4,004 of 50,000. Top 50 holders
Most of this portfolio concentrates in A44B - see who else leads that technology area. A44B leaders
Check what the four-part Innovation Score actually rewards before comparing it to another company. How the score works

Patent counts and the Innovation Score measure patenting activity, not commercial success or the legal strength of any patent. Many patents are filed defensively. Verify the status of an individual patent against official USPTO records.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

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 byPlainPatent Editorial, US Patent Intelligence Editorial Team · 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.