China National Digital Switching System Engineering & Technological R&D Center
USPTO PatentsView assignee record - 6 granted patents across 2 technology areas, recorded in grant years 2018–2025. 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: H04L (Transmission OF Digital Information, e.g. Telegraphic Communication).
The verdict
According to USPTO PatentsView, China ranks #39,438 of 49,997 tracked US assignees by granted-patent volume, with 6 patents across 2 technology areas.
- #39,438
- of 49,997 US assignees by volume
- 7th percentile
- by Innovation Score (20.2/100)
- 14.2
- avg claims per patent
- +100%
- grant velocity, last 5 yrs
USPTO PatentsView assignee plate
Corpus R39438 · Foreign Corporation #39,438 · 6 grants
GRANTS-MICRO · LOWER-Q · PHOTO-FINISH · CPC-NARROW · INNOV-THIN · CLAIMS-RICH · TYPE-FRNCORP · VEL-SURGE · BOOK-FULL
- GRANTS-MICRO 6 grants
- LOWER-Q #39,438/49,997
- PHOTO-FINISH Chengdu BOE Display…
- CPC-NARROW H04L · 2 areas
- INNOV-THIN 20.2/100
- CLAIMS-RICH 14.2 claims/avg
- TYPE-FRNCORP Foreign Corp
- VEL-SURGE +100% vel
- BOOK-FULL 10/10 fields
Nearest grant-volume peer: Chengdu BOE Display Sci-tech 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 China’s 20.2 Innovation Score adds up
The same four weighted components behind every Innovation Score on PlainPatent: portfolio volume, grant velocity, technology breadth, and claim depth.
Innovation-score neighbourhood around China
Lowest and highest poles plus nearest Innovation Score peers, not a full corpus board reprint.
- Qualcomm Incorporated · highest
Qualcomm Incorporated · highest
85 score
- China National… · this assignee 20
China National… · this assignee
20 score
- 3D Lighting… · lowest 7
3D Lighting… · lowest
7 score
What this shows China's Innovation Score is 20.2/100 (7th 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 China?
Each dot is one of China’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). China’s own 14.2 claims/patent is ABOVE the 9.2 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.
Where China's grants concentrate
China National Digital Switching System Engineering & Technological R&D Center is a focused PatentsView assignee: 2 CPC subclasses with 100% of grants classified under H04L (Transmission OF Digital Information, e.g. Telegraphic Communication). Peak complete grant year is 2021 (2 grants) versus a trough of 1 in 2018. By volume, China sits between Chengdu BOE Display Sci-tech Co., Ltd. and China Tobacco Hubei Industrial Corporation Limited.
Who files at China's volume?
Granted US patents 2015–2025 versus its nearest-ranked assignees by volume, this company marked ◀
- Chengdu BOE Displ…
Chengdu BOE Display Sci-tech Co., Ltd.
6 patents
- Chengdu Youyang E…
Chengdu Youyang Electromechanical Product Design Co., Ltd.
6 patents
- China Academy OF…
China Academy OF Aerospace Aerodynamics
6 patents
- China Automotive…
China Automotive Systems, Inc.
6 patents
- China Railway NO…
China Railway NO. 3 Engineering Group Co., Ltd.
6 patents
- China Railway Tun…
China Railway Tunnel Group Co., Ltd.
6 patents
- China Three Gorge…
China Three Gorges Renewables (GROUP) Co., Ltd.
6 patents
- China Tobacco Hub…
China Tobacco Hubei Industrial Corporation Limited
6 patents
- China National Di… ◀
China National Digital Switching System Engineering & Technological R&D Center
6 patents
What this shows China holds 6 patents at rank #39,367, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.
Companies ranked near China
By rank, the assignees closest to #39,367 in granted patent volume.
- Chengdu BOE Display Sci-tech Co., Ltd. #39,363 · 6 patents
- Chengdu Youyang Electromechanical Product Design Co., Ltd. #39,364 · 6 patents
- China Academy OF Aerospace Aerodynamics #39,365 · 6 patents
- China Automotive Systems, Inc. #39,366 · 6 patents
- China Railway NO. 3 Engineering Group Co., Ltd. #39,368 · 6 patents
- China Railway Tunnel Group Co., Ltd. #39,369 · 6 patents
- China Three Gorges Renewables (GROUP) Co., Ltd. #39,370 · 6 patents
- China Tobacco Hubei Industrial Corporation Limited #39,371 · 6 patents
Leaders in H04L (Transmission OF Digital Information)
Other assignees with the most granted patents in China's primary technology class.
- International Business Machines Corporation 15,969 in class
- Qualcomm Incorporated 13,594 in class
- Huawei Technologies Co., Ltd. 11,697 in class
- Samsung Electronics Co., Ltd. 10,543 in class
- LG Electronics Inc. 9,062 in class
- Telefonaktiebolaget LM Ericsson (Publ) 8,543 in class
- Cisco Technology, Inc. 7,502 in class
- Microsoft Technology Licensing, LLC 7,301 in class
China's Innovation Score vs. every tracked assignee
Composite of portfolio volume, grant velocity, technology breadth, and claim depth (0–100)
20 7th percentile higher than 7% 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
Grants by year
Teal-shaded recent years (2020–present) versus the 2018–2019 baseline. Full figures in the table below.
View data table
| Year | Patents Granted | Share of Period |
|---|---|---|
| 2018 | 1 | 16.7% |
| 2021 | 2 | 33.3% |
| 2025partial year | 3 | 50.0% |
Which technologies does China National Digital Switching System Engineering & Technological R&D Center patent most?
Top 2 of 2 technology areas
Data Source
USPTO PatentsView, US granted patents 2015–2025
What to do with this data
China National Digital Switching System Engineering & Technological R&D Center's patent record in context - here's where to go next.
- China National Digital Switching System Engineering & Technological R&D Center's lead technology class is H04L (Transmission OF Digital Information, e.g. Telegraphic Communication), 100% of its portfolio - see every assignee active in that class. Explore H04L
- Ranked #39,438 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
- Compare China National Digital Switching System Engineering & Technological R&D Center against Chengdu BOE Display Sci-tech Co., Ltd., an assignee filing at a similar volume. Compare portfolios
- Innovation Score of 20.2/100 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.
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.