Where does SF Diamond Co., Ltd. rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), SF Diamond Co., Ltd. ranks #14,258 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 SF Diamond Co., Ltd. hold?

SF Diamond Co., Ltd. holds 21 US utility patents granted between 2020 and 2025, spanning 6 technology areas.

What is SF Diamond Co., Ltd.'s Innovation Score?

SF Diamond Co., Ltd. has an Innovation Score of 42.5 out of 100 (top 30% of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

Is SF Diamond Co., Ltd.'s patent grant rate increasing or decreasing?

Insufficient historical data is available to calculate a velocity trend for SF Diamond Co., Ltd..

What does claim depth mean for SF Diamond Co., Ltd.'s patents?

SF Diamond Co., Ltd.'s patents average 5.3 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 SF Diamond 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

SF Diamond Co., Ltd.

Q: What technology areas does SF Diamond Co., Ltd. focus on?

SF Diamond Co., Ltd.'s top technology area is E21B (Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells) with 6 patents, ranking #569 of 1,363 assignees active in that subclass. Grants appear in 6 CPC subclasses total.

USPTO PatentsView assignee record - 21 granted patents across 6 technology areas, recorded in grant years 2020–2025. 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: E21B (Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells).

Compiled by PlainPatent · May 15, 2026

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Explore the portfolio See the ranking

The verdict

According to USPTO PatentsView, SF ranks #14,258 of 49,997 tracked US assignees by granted-patent volume, with 21 patents across 6 technology areas.

#14,258
of 49,997 US assignees by volume: Top 30%
by Innovation Score (42.5/100): 5.3
avg claims per patent

USPTO PatentsView assignee plate

Corpus R14258 · Foreign Corporation #14,258 · 21 grants

GRANTS-SMALL · MID-PACK · PHOTO-FINISH · CPC-NARROW · INNOV-PAR · CLAIMS-SPARSE · TYPE-FRNCORP · SPAN-YRS · BOOK-RICH

GRANTS-SMALL 21 grants
MID-PACK #14,258/49,997
PHOTO-FINISH Schwind eye-tech-sol…
CPC-NARROW E21B · 6 areas
INNOV-PAR 42.5/100
CLAIMS-SPARSE 5.3 claims/avg
TYPE-FRNCORP Foreign Corp
SPAN-YRS 2020–2025 · 6y
BOOK-RICH 9/10 fields

Nearest grant-volume peer: Schwind eye-tech-solutions GmbH (±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 SF’s 42.5 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 10.7 pts (25%) Velocity 20.0 pts (47%) Breadth 8.7 pts (20%) Claim depth 3.2 pts (8%)

Qualcomm Incorporated · highest

85
SF Diamond · this assignee

43
3D Lighting… · lowest

7

What this shows SF's Innovation Score is 42.5/100 (top 30% 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 SF?

Each dot is one of SF’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). SF’s own 5.3 claims/patent is at or below the 17.5 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

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

Where SF's grants concentrate

SF Diamond Co., Ltd. is a focused PatentsView assignee: 6 CPC subclasses with 28.6% of grants classified under E21B (Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells). Peak complete grant year is 2023 (11 grants) versus a trough of 1 in 2020. By volume, SF sits between Schwind eye-tech-solutions GmbH and Shedrain Corporation.

SF's three-year grant acceleration

SF Diamond Co., Ltd. shows 17 grants in 2022–2024 against only 1 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.

Schwind eye-tech-…

21
SCT

21
Semantic PTY

21
Seyond

21
Shanghai Easy-use…

21
Sharp Fluidics

21
Shawcor

21
Shedrain

21
SF Diamond ◀

21

What this shows SF holds 21 patents at rank #14,248, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near SF

By rank, the assignees closest to #14,248 in granted patent volume.

Leaders in E21B (Earth OR Rock Drilling)

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

SF's Innovation Score vs. every tracked assignee

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

43 Top 30% higher than 70% 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 · 2020–2025

Grants by year

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

View data table

SF Diamond Co., Ltd. patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2020	1	4.8%
2022	1	4.8%
2023	11	52.4%
2024	5	23.8%
2025partial year	3	14.3%

Which technologies does SF Diamond Co., Ltd. patent most?

E21B - Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells 6

C01B - Non-metallic ELEMENTS; Compounds THEREOF; ; Metalloids OR Compounds Thereof NOT Covered BY Subclass C01c 3

C01P - Indexing Scheme Relating TO Structural AND Physical Aspects OF Solid Inorganic Compounds 3

C04B - Lime, MAGNESIA; SLAG; CEMENTS; Compositions Thereof, e.g. Mortars, Concrete OR Like Building MATERIALS; Artificial Stone ; Ceramics ; REFRACTORIES; Treatment OF Natural Stone 2

C22C - Alloys 1

B24D - Tools FOR Grinding, Buffing OR Sharpening 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

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

SF Diamond Co., Ltd.'s lead technology class is E21B (Earth OR Rock DRILLING; Obtaining OIL, GAS, Water, Soluble OR Meltable Materials OR A Slurry OF Minerals From Wells), 28.6% of its portfolio - see every assignee active in that class. Explore E21B
Ranked #14,258 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare SF Diamond Co., Ltd. against Schwind eye-tech-solutions GmbH, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 42.5/100 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.