Where does China ENFI Engineering Corporation rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), China ENFI Engineering Corporation ranks #25,992 of 50,000 assignees by granted-patent volume, the same sort as the companies listing and top-holders ranking. See /methodology/#corpus-placement.

How many patents does China ENFI Engineering Corporation hold?

China ENFI Engineering Corporation holds 10 US utility patents granted between 2018 and 2025, spanning 13 technology areas.

What is China ENFI Engineering Corporation's Innovation Score?

China ENFI Engineering Corporation has an Innovation Score of 31.8 out of 100 (top 61% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is China ENFI Engineering Corporation's patent grant rate increasing or decreasing?

China ENFI Engineering Corporation's recent grant velocity is +25% 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 China ENFI Engineering Corporation's patents?

China ENFI Engineering Corporation'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 China ENFI Engineering Corporation 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

China ENFI Engineering Corporation

Q: What technology areas does China ENFI Engineering Corporation focus on?

China ENFI Engineering Corporation's top technology area is C22B (PRODUCTION AND REFINING OF METALS ; PRETREATMENT OF RAW MATERIALS) with 4 patents. Grants appear in 13 CPC subclasses total.

USPTO PatentsView assignee record - 10 granted patents across 13 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: C22B (PRODUCTION AND REFINING OF METALS ; PRETREATMENT OF RAW MATERIALS).

Compiled by PlainPatent · May 15, 2026

Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, China ranks #25,992 of 50,000 tracked US assignees by granted-patent volume, with 10 patents across 13 technology areas.

#25,992
of 50,000 US assignees by volume: Top 61%
by Innovation Score (31.8/100): 11.2
avg claims per patent: +25%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R25992 · Foreign Corporation #25,992 · 10 grants

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

GRANTS-MICRO 10 grants
MID-PACK #25,992/50,000
PHOTO-FINISH Changzhou Tronly New…
CPC-FOCUS C22B · 13 areas
INNOV-THIN 31.8/100
CLAIMS-PAR 11.2 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-UP +25% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Changzhou Tronly New Electronics Materials 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.

Qualcomm Incorporated · highest

85
China ENFI Engineering · this assignee

32
3D Lighting Innovati… · lowest

7

What this shows China's Innovation Score is 31.8/100 (top 61% 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 China's grants concentrate

China ENFI Engineering Corporation is a focused PatentsView assignee: 13 CPC subclasses with 40% of grants classified under C22B (PRODUCTION AND REFINING OF METALS ; PRETREATMENT OF RAW MATERIALS). Peak complete grant year is 2019 (3 grants) versus a trough of 1 in 2018. By volume, China sits between Changzhou Tronly New Electronics Materials Co., Ltd. and Cipher Trace, Inc..

China's three-year grant acceleration

China ENFI Engineering Corporation shows 3 grants in 2022–2024 against only 5 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.

Changzhou Tronly…

10
Chattem

10
Checkerspot

10
Chiasma

10
Chronisense Medic…

10
Chronix Biomedical

10
Cielo Wigle

10
Cipher Trace

10
China ENFI Engine… ◀

10

What this shows China holds 10 patents at rank #26,036, 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 #26,036 in granted patent volume.

Leaders in C22B (Production AND Refining OF Metals)

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

China's Innovation Score vs. every tracked assignee

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

32 Top 61% higher than 39% 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 · 2018–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2018–2019 baseline. Full figures in the table below.

View data table

China ENFI Engineering Corporation patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2018	1	10.0%
2019	3	30.0%
2021	2	20.0%
2022	1	10.0%
2023	2	20.0%
2025partial year	1	10.0%

Which technologies does China ENFI Engineering Corporation patent most?

C22B - PRODUCTION AND REFINING OF METALS ; PRETREATMENT OF RAW MATERIALS 4

Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS 4

F27D - DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE 3

B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS 2

C01B - NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C 1

Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION 1

C23C - COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL 1

F27B - FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS 1

D01D - MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS 1

C04B - LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE ; CERAMICS ; REFRACTORIES; TREATMENT OF NATURAL STONE 1

D01F - CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS 1

B01F - MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING 1

G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES 1

Top 13 of 13 technology areas

Where it ranks

Overall rank by patents

#25,992

of 50,000 tracked assignees

Innovation Score

31.8 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

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.