Where does ChemFree Corporation rank among US patent assignees?

According to USPTO PatentsView (2015–2025 granted utility patents), ChemFree Corporation ranks #39,422 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 ChemFree Corporation hold?

ChemFree Corporation holds 6 US utility patents granted between 2015 and 2020, spanning 2 technology areas.

What is ChemFree Corporation's Innovation Score?

ChemFree Corporation has an Innovation Score of 17.3 out of 100 (4th percentile of the corpus). This composite metric weighs portfolio volume (40%), grant velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does ChemFree Corporation focus on?

ChemFree Corporation's top technology area is D06F (Laundering, Drying, Ironing, Pressing OR Folding Textile Articles) with 3 patents, ranking #84 of 220 assignees active in that subclass. Grants appear in 2 CPC subclasses total.

Is ChemFree Corporation's patent grant rate increasing or decreasing?

ChemFree Corporation's recent grant velocity is -80% 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 ChemFree Corporation's patents?

ChemFree Corporation's patents average 9.3 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 ChemFree 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 US Corporation

ChemFree Corporation

USPTO PatentsView assignee record - 6 granted patents across 2 technology areas, recorded in grant years 2015–2020. 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: D06F (Laundering, Drying, Ironing, Pressing OR Folding Textile Articles).

Compiled by PlainPatent · May 15, 2026

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The verdict

According to USPTO PatentsView, Chemfree ranks #39,422 of 49,997 tracked US assignees by granted-patent volume, with 6 patents across 2 technology areas.

#39,422
of 49,997 US assignees by volume: 4th percentile
by Innovation Score (17.3/100): 9.3
avg claims per patent: -80%
grant velocity, last 5 yrs

USPTO PatentsView assignee plate

Corpus R39422 · US Corporation #39,422 · 6 grants

GRANTS-MICRO · LOWER-Q · PHOTO-FINISH · CPC-NARROW · INNOV-LOW · CLAIMS-PAR · TYPE-USCORP · VEL-DROP · BOOK-FULL

GRANTS-MICRO 6 grants
LOWER-Q #39,422/49,997
PHOTO-FINISH Charles Buist DMD PA
CPC-NARROW D06F · 2 areas
INNOV-LOW 17.3/100
CLAIMS-PAR 9.3 claims/avg
TYPE-USCORP US Corporation
VEL-DROP -80% vel
BOOK-FULL 10/10 fields

Nearest grant-volume peer: Charles Buist, DMD, PA (±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 Chemfree’s 17.3 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 6.7 pts (39%) Velocity 0.0 pts (0%) Breadth 5.0 pts (29%) Claim depth 5.6 pts (32%)

Qualcomm Incorporated · highest

85
ChemFree · this assignee

17
3D Lighting… · lowest

7

What this shows Chemfree's Innovation Score is 17.3/100 (4th 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 Chemfree?

Each dot is one of Chemfree’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). Chemfree’s own 9.3 claims/patent is at or below the 10.3 median for these volume peers. Volume here does not track with deeper claims; several lower-volume peers claim more thoroughly per patent.

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

Where Chemfree's grants concentrate

ChemFree Corporation is a focused PatentsView assignee: 2 CPC subclasses with 50% of grants classified under D06F (Laundering, Drying, Ironing, Pressing OR Folding Textile Articles). Peak complete grant year is 2015 (3 grants) versus a trough of 1 in 2016. By volume, Chemfree sits between Charles Buist, DMD, PA and Chengdu Yishouweisheng Technology Inc..

Charles Buist DMD…

6
Charm Alarm

6
Chase

6
Cheray

6
Chemapotheca

6
Chemic Laboratori…

6
Chengdu Baiyu Pha…

6
Chengdu Yishouwei…

6
Chemfree ◀

6

What this shows ChemFree holds 6 patents at rank #39,545, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near ChemFree

By rank, the assignees closest to #39,545 in granted patent volume.

Leaders in D06F (Laundering)

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

Chemfree's Innovation Score vs. every tracked assignee

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

17 4th percentile higher than 4% 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 · 2015–2020

Grants by year

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

View data table

ChemFree Corporation patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	3	50.0%
2016	1	16.7%
2017	1	16.7%
2020	1	16.7%

Which technologies does ChemFree Corporation patent most?

D06F - Laundering, Drying, Ironing, Pressing OR Folding Textile Articles 3

B08B - Cleaning IN GENERAL; Prevention OF Fouling IN General 3

Top 2 of 2 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

ChemFree Corporation's patent record in context - here's where to go next.

ChemFree Corporation's lead technology class is D06F (Laundering, Drying, Ironing, Pressing OR Folding Textile Articles), 50% of its portfolio - see every assignee active in that class. Explore D06F
Ranked #39,422 of 49,997 tracked assignees by patent volume - see the full leaderboard. See the ranking
Compare ChemFree Corporation against Charles Buist, DMD, PA, an assignee filing at a similar volume. Compare portfolios
Innovation Score of 17.3/100 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.