Where does Nippon Tungsten Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), Nippon Tungsten Co., Ltd. ranks #23,091 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 Nippon Tungsten Co., Ltd. hold?

Nippon Tungsten Co., Ltd. holds 12 US utility patents granted between 2015 and 2023, spanning 16 technology areas.

What is Nippon Tungsten Co., Ltd.'s Innovation Score?

Nippon Tungsten Co., Ltd. has an Innovation Score of 34.7 out of 100 (49th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is Nippon Tungsten Co., Ltd.'s patent grant rate increasing or decreasing?

Nippon Tungsten Co., Ltd.'s recent grant velocity is -50% 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 Nippon Tungsten Co., Ltd.'s patents?

Nippon Tungsten Co., Ltd.'s patents average 8.4 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 Nippon Tungsten 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.

USPTO 2015–2025 USPTO PatentsView Foreign Corporation

Nippon Tungsten Co., Ltd.

Q: What technology areas does Nippon Tungsten Co., Ltd. focus on?

Nippon Tungsten Co., Ltd.'s top technology area is C04B (Lime, MAGNESIA; SLAG; CEMENTS; Compositions Thereof, e.g. Mortars, Concrete OR Like Building MATERIALS; Artificial Stone ; Ceramics ; REFRACTORIES; Treatment OF Natural Stone) with 5 patents, ranking #266 of 1,052 assignees active in that subclass. Grants appear in 16 CPC subclasses total.

USPTO PatentsView assignee record - 12 granted patents across 16 technology areas, recorded in grant years 2015–2023. 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: C04B (Lime, MAGNESIA; SLAG; CEMENTS; Compositions Thereof, e.g. Mortars, Concrete OR Like Building MATERIALS; Artificial Stone ; Ceramics ; REFRACTORIES; Treatment OF Natural Stone).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Nippon ranks #23,091 of 49,997 tracked US assignees by granted-patent volume, with 12 patents across 16 technology areas.

#23,091
of 49,997 US assignees by volume: 49th percentile
by Innovation Score (34.7/100): 8.4
avg claims per patent: -50%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R23091 · Foreign Corporation #23,091 · 12 grants

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

GRANTS-MICRO 12 grants
MID-PACK #23,091/49,997
PHOTO-FINISH Nihon Yamamura Glass
CPC-FOCUS C04B · 16 areas
INNOV-THIN 34.7/100
CLAIMS-PAR 8.4 claims/avg
TYPE-FRNCORP Foreign Corp
VEL-DROP -50% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Nihon Yamamura Glass 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 Nippon’s 34.7 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 8.9 pts (26%) Velocity 6.7 pts (19%) Breadth 14.1 pts (41%) Claim depth 5.1 pts (15%)

Qualcomm Incorporated · highest

85
Nippon Tungsten · this assignee

35
3D Lighting… · lowest

7

What this shows Nippon's Innovation Score is 34.7/100 (49th 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 Nippon?

Each dot is one of Nippon’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). Nippon’s own 8.4 claims/patent is ABOVE the 3.6 median for these volume peers. More thorough claims than most filers at this scale, not just more of them.

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

Where Nippon's grants concentrate

Nippon Tungsten Co., Ltd. is a focused PatentsView assignee: 16 CPC subclasses with 41.7% of grants classified under C04B (Lime, MAGNESIA; SLAG; CEMENTS; Compositions Thereof, e.g. Mortars, Concrete OR Like Building MATERIALS; Artificial Stone ; Ceramics ; REFRACTORIES; Treatment OF Natural Stone). Peak complete grant year is 2016 (3 grants) versus a trough of 1 in 2017. By volume, Nippon sits between Nihon Yamamura Glass Co., Ltd. and NLU Products, L.L.C..

Nippon's three-year grant acceleration

Nippon Tungsten Co., Ltd. shows 3 grants in 2022–2024 against only 3 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.

Nihon Yamamura Gl…

12
Ningbo Gecen Prom…

12
Ningobo Yinzhou S…

12
Nippon Conlux

12
Nishikawa

12
Nisshinbo Brake

12
NLT Spine

12
NLU Products L L C

12
Nippon Tungsten ◀

12

What this shows Nippon holds 12 patents at rank #23,048, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Nippon

By rank, the assignees closest to #23,048 in granted patent volume.

Leaders in C04B (Lime)

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

Nippon's Innovation Score vs. every tracked assignee

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

35 49th percentile higher than 49% 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 · 2015–2023

Grants by year

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

View data table

Nippon Tungsten Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	2	16.7%
2016	3	25.0%
2017	1	8.3%
2019	2	16.7%
2020	1	8.3%
2022	2	16.7%
2023	1	8.3%

Which technologies does Nippon Tungsten Co., Ltd. patent most?

C04B - Lime, MAGNESIA; SLAG; CEMENTS; Compositions Thereof, e.g. Mortars, Concrete OR Like Building MATERIALS; Artificial Stone ; Ceramics ; REFRACTORIES; Treatment OF Natural Stone 5

G11B - Information Storage Based ON Relative Movement Between Record Carrier AND Transducer 4

H01L - Semiconductor Devices NOT Covered BY Class H10 3

H01J - Electric Discharge Tubes OR Discharge Lamps 3

C23F - Non-mechanical Removal OF Metallic Material From Surface ; Inhibiting Corrosion OF Metallic Material OR Incrustation IN GENERAL; Multi-step Processes FOR Surface Treatment OF Metallic Material Involving AT Least ONE Process Provided FOR IN Class C23 AND AT Least ONE Process Covered BY Subclass C21d 2

B26D - CUTTING; Details Common TO Machines FOR Perforating, Punching, Cutting-out, Stamping-out OR Severing 2

B26F - PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; Severing BY Means Other Than Cutting 2

H10H - Inorganic Light-emitting Semiconductor Devices Having Potential Barriers 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

Y10T - Technical Subjects Covered BY Former US Classification 1

C22C - Alloys 1

F16C - SHAFTS; Flexible SHAFTS; Elements OR Crankshaft MECHANISMS; Rotary Bodies Other Than Gearing ELEMENTS; Bearings 1

F04D - Non-positive-displacement Pumps 1

B82Y - Specific Uses OR Applications OF NANOSTRUCTURES; Measurement OR Analysis OF NANOSTRUCTURES; Manufacture OR Treatment OF Nanostructures 1

H01B - CABLES; CONDUCTORS; INSULATORS; Selection OF Materials FOR Their Conductive, Insulating OR Dielectric Properties 1

Top 15 of 16 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

Nippon Tungsten Co., Ltd.'s patent record in context - here's where to go next.

Nippon Tungsten Co., Ltd.'s lead technology class is C04B (Lime, MAGNESIA; SLAG; CEMENTS; Compositions Thereof, e.g. Mortars, Concrete OR Like Building MATERIALS; Artificial Stone ; Ceramics ; REFRACTORIES; Treatment OF Natural Stone), 41.7% of its portfolio - see every assignee active in that class. Explore C04B
Ranked #23,091 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare Nippon Tungsten Co., Ltd. against Nihon Yamamura Glass Co., Ltd., an assignee filing at a similar volume. Compare portfolios
Innovation Score of 34.7/100 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.