USPTO 2015–2025 USPTO PatentsView Foreign Corporation

Em-tech Co., Ltd

USPTO PatentsView assignee record - 58 granted patents across 24 technology areas, recorded in grant years 2015–2025. 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: H04R (LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS).

Compiled by PlainPatent · May 15, 2026

Explore the portfolio See the ranking

Total patents granted

CPC technology areas

9.8

Avg claims per patent

+74%

5-year grant velocity

The verdict

According to USPTO PatentsView, Em-tech ranks #5,835 of 50,000 tracked US assignees by granted-patent volume, with 58 patents across 24 technology areas.

#5,835
of 50,000 US assignees by volume: Top 25%
by Innovation Score (44.6/100): 9.8
avg claims per patent: +74%
grant velocity, last 5 yrs

Portfolio overview

Em-tech Co., Ltd has been granted 58 US utility patents between 2015 and 2025, placing Em-tech Co., Ltd at #5,835 of 50,000 across all assignees tracked by PlainPatent. This portfolio spans 24 distinct Cooperative Patent Classification (CPC) subclasses, averaging 9.8 claims per patent with primary concentration in H04R (LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS). As a Foreign Corporation, Em-tech Co., Ltd is one of the more focused assignees in the PatentsView dataset. By volume, Em-tech sits between Contec, Llc (58 patents, rank #5,830) and Flashbay Electronics Hong Kong Limited (58 patents, rank #5,838) - the closest US assignees by grant volume. The composite Innovation Score of 44.6/100 blends portfolio volume, grant velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.

Grant cadence records the difference between two grant-year windows. Between 2020 and 2024 the company received 33 grants, compared with 19 in the 2015–2019 window, a +74% shift in five-year grant velocity. Both windows cover five complete grant years; the latest PatentsView year is a partial release and is excluded from this comparison, though it still appears in the yearly table and chart below. Grant timing can lag the related application by years, so this comparison does not establish current R&D spending, strategic intent, or a company’s application activity. The Foreign Corporation classification provides context for the assignee record, not a conclusion about its business strategy.

Claim depth and technology breadth describe this aggregate record. Em-tech Co., Ltd's 9.8 average claims per patent is an average count, not a measure of claim scope, legal strength, enforceability, or design-around risk. The record spans 24 CPC subclasses. Combined with portfolio volume, these figures let readers compare the documented grant records of assignees in similar technology classes.

Contec

58
Dfine

58
Dongbu Hitek

58
Duquesne Universi…

58
Echostar UK Holdi…

58
Engineered Contro…

58
Fuerst Group

58
Flashbay Hong Kong

58
Em-tech ◀

58

What this shows Em-tech holds 58 patents at rank #5,834, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Em-tech

By rank, the assignees closest to #5,834 in granted patent volume.

Leaders in H04R (Loudspeakers)

Other assignees with the most granted patents in Em-tech's primary technology class.

Assignees with similar portfolio profiles

Two PlainPatent-derived peer sets for Em-tech, neither rank-band nor same-CPC leaders (those blocks stay above).

Similar innovation score

Nearest assignees by Innovation Score (45 here).

Therma-stor Llc 45 GE Hybrid Technologies, Llc 45 Hexagon Technology AS 45 OCI Company Ltd. 45

Similar claim depth

Nearest assignees by average claims per patent (9.8 here).

Daishinku Corporation 9.8 avg Asahi Intecc Co., Ltd. 9.8 avg Samsung Heavy IND. Co., Ltd. 9.8 avg CLO Virtual Fashion Inc. 9.8 avg

Em-tech's Innovation Score vs. every tracked assignee

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

45 Top 25% higher than 75% 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 · 2015–2025

Grants by year

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

View data table

Em-tech Co., Ltd patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	6	10.3%
2016	2	3.4%
2017	2	3.4%
2018	2	3.4%
2019	7	12.1%
2020	4	6.9%
2021	8	13.8%
2022	14	24.1%
2023	4	6.9%
2024	3	5.2%
2025partial year	6	10.3%

Which technologies does Em-tech Co., Ltd patent most?

H04R - LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS 49

H02K - DYNAMO-ELECTRIC MACHINES 4

H10N - ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR 4

B06B - METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, ; e.g.; FOR PERFORMING MECHANICAL WORK IN GENERAL 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

H05K - PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS 2

H01F - MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES 2

F02K - JET-PROPULSION PLANTS 2

B64D - EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT 2

G10L - SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING 2

C07D - HETEROCYCLIC COMPOUNDS 1

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

A61B - DIAGNOSIS; SURGERY; IDENTIFICATION 1

A61N - ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY 1

H02N - ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR 1

Top 15 of 24 technology areas

Grant record at a glance

Portfolio Volume 58 grants

CPC subclasses 24

Avg. claims / grant 9.8

Velocity +74%

Historical grant data only; it does not rate legal strength or current strategy.

Where it ranks

Overall rank by patents

#5,835

of 50,000 tracked assignees

Innovation Score

44.6 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

Frequently Asked Questions

Where does Em-tech Co., Ltd rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Em-tech Co., Ltd ranks #5,835 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 Em-tech Co., Ltd hold?

Em-tech Co., Ltd holds 58 US utility patents granted between 2015 and 2025, spanning 24 technology areas.

What is Em-tech Co., Ltd's Innovation Score?

Em-tech Co., Ltd has an Innovation Score of 44.6 out of 100 (top 25% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Em-tech Co., Ltd focus on?

Em-tech Co., Ltd's top technology area is H04R (LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS) with 49 patents. Grants appear in 24 CPC subclasses total.

Is Em-tech Co., Ltd's patent grant rate increasing or decreasing?

Em-tech Co., Ltd's recent grant velocity is +74% compared to the prior five-year period (grant years, not application filing dates). This indicates accelerating grant output.

What does claim depth mean for Em-tech Co., Ltd's patents?

Em-tech Co., Ltd's patents average 9.8 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 Em-tech 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.

How to use this portfolio

Em-tech's 58 grants land it in the top 25% 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 - Em-tech ranks #5,835 of 50,000. Top 50 holders
Most of this portfolio concentrates in H04R - see who else leads that technology area. H04R 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

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.