Where does DDK Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), DDK Ltd. ranks #15,946 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 DDK Ltd. hold?

DDK Ltd. holds 18 US utility patents granted between 2015 and 2018, spanning 6 technology areas.

What is DDK Ltd.'s Innovation Score?

DDK Ltd. has an Innovation Score of 23.7 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%).

Is DDK Ltd.'s patent grant rate increasing or decreasing?

DDK Ltd.'s recent grant velocity is -100% 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 DDK Ltd.'s patents?

DDK Ltd.'s patents average 8.2 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 DDK 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

DDK Ltd.

Q: What technology areas does DDK Ltd. focus on?

DDK Ltd.'s top technology area is H01R (Electrically-conductive CONNECTIONS; Structural Associations OF A Plurality OF Mutually-insulated Electrical Connecting ELEMENTS; Coupling DEVICES; Current Collectors) with 16 patents, ranking #197 of 2,265 assignees active in that subclass. Grants appear in 6 CPC subclasses total.

USPTO PatentsView assignee record - 18 granted patents across 6 technology areas, recorded in grant years 2015–2018. 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: H01R (Electrically-conductive CONNECTIONS; Structural Associations OF A Plurality OF Mutually-insulated Electrical Connecting ELEMENTS; Coupling DEVICES; Current Collectors).

Compiled by PlainPatent · May 15, 2026

RSS updates for this company

Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, DDK ranks #15,946 of 49,997 tracked US assignees by granted-patent volume, with 18 patents across 6 technology areas.

#15,946
of 49,997 US assignees by volume: 13th percentile
by Innovation Score (23.7/100): 8.2
avg claims per patent: -100%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R15946 · Foreign Corporation #15,946 · 18 grants

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

GRANTS-MICRO 18 grants
MID-PACK #15,946/49,997
PHOTO-FINISH Daher Aerospace
CPC-NARROW H01R · 6 areas
INNOV-THIN 23.7/100
CLAIMS-PAR 8.2 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DROP -100% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Daher Aerospace (±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 DDK’s 23.7 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 10.2 pts (43%) Velocity 0.0 pts (0%) Breadth 8.7 pts (37%) Claim depth 4.9 pts (21%)

Qualcomm Incorporated · highest

85
DDK · this assignee

24
3D Lighting… · lowest

7

What this shows DDK's Innovation Score is 23.7/100 (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 DDK?

Each dot is one of DDK’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). DDK’s own 8.2 claims/patent is ABOVE the 7.7 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where DDK's grants concentrate

DDK Ltd. is a focused PatentsView assignee: 6 CPC subclasses with 88.9% of grants classified under H01R (Electrically-conductive CONNECTIONS; Structural Associations OF A Plurality OF Mutually-insulated Electrical Connecting ELEMENTS; Coupling DEVICES; Current Collectors). Peak complete grant year is 2017 (10 grants) versus a trough of 1 in 2016. By volume, DDK sits between Daher Aerospace and Digital Endoscopy GMBH.

Daher Aerospace

18
Daido Kogyo

18
Dakang Holding

18
DBV

18
Deepmotor

18
Densbits

18
Dentlytec G P L

18
Digital Endoscopy

18
DDK ◀

18

What this shows DDK holds 18 patents at rank #15,944, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near DDK

By rank, the assignees closest to #15,944 in granted patent volume.

Leaders in H01R (Electrically-conductive Connections)

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

DDK'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 · 2015–2018

Grants by year

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

View data table

DDK Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	2	11.1%
2016	1	5.6%
2017	10	55.6%
2018	5	27.8%

Which technologies does DDK Ltd. patent most?

H01R - Electrically-conductive CONNECTIONS; Structural Associations OF A Plurality OF Mutually-insulated Electrical Connecting ELEMENTS; Coupling DEVICES; Current Collectors 16

H05K - Printed CIRCUITS; Casings OR Constructional Details OF Electric APPARATUS; Manufacture OF Assemblages OF Electrical Components 7

C25D - Processes FOR THE Electrolytic OR Electrophoretic Production OF COATINGS; ELECTROFORMING; Apparatus Therefor 1

Y02E - Reduction OF Greenhouse GAS [GHG] Emissions, Related TO Energy Generation, Transmission OR Distribution 1

H01M - Processes OR Means, e.g. Batteries, FOR THE Direct Conversion OF Chemical Energy Into Electrical Energy 1

Y10S - Technical Subjects Covered BY Former Uspc Cross-reference ART Collections [XRACs] AND Digests 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

DDK Ltd.'s patent record in context - here's where to go next.

DDK Ltd.'s lead technology class is H01R (Electrically-conductive CONNECTIONS; Structural Associations OF A Plurality OF Mutually-insulated Electrical Connecting ELEMENTS; Coupling DEVICES; Current Collectors), 88.9% of its portfolio - see every assignee active in that class. Explore H01R
Ranked #15,946 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare DDK Ltd. against Daher Aerospace, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 23.7/100 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.