CPC technology class · G01

G01F - Measuring Volume

Measuring volume, volume flow, mass flow or liquid level; metering by volume. 10,911 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

10,911
US patents granted: #11/18
in G01: 2.8%
G01 class share: +9%
5-yr velocity

The verdict

According to USPTO PatentsView, Measuring Volume ranks #163 of 670 CPC technology areas - 10,911 US patents granted since 2015, with recorded grant volume up 9% over five years.

#163
of 670 CPC technology areas: 10,911
US patents granted, 2015–2025: Endress+Hauser Flowtec
leading assignee (279): +9%
grant velocity, last 5 yrs

How G01F's grant cadence moved

Between 2020–2024, G01F recorded 5,213 grants versus 4,764 in 2015–2019 (+9% equal-window velocity). Across complete years, output peaked in 2020 at 1,277 grants and bottomed in 2015 at 737 (+73% peak-over-trough). Lead assignee Endress+Hauser Flowtec AG holds 2.6% of the class ; the top three share 5.9%.

Leaderboard read

G01F concentration, lead at 2.6%

Endress+Hauser Flowtec AG leads this historical grant record at 2.6% of G01F - foreign corporation assignees hold 54% of class grants (3,076 of 5,749). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 2.6%
Top three share: 5.9%
Lead over #2: 92

Where G01F sits inside G01

Among 18 subclasses in G01 (MEASURING; Testing), G01F ranks #11 and holds 2.8% of the parent class's 393,430 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

G01N 115,972 G01R 53,716 G01S 52,756 G01C 32,360 G01B 22,043 G01J 16,402 G01M 14,845 G01V 14,307

Rising assignees active in G01F

Company-wide grant multiples (2022–2024 vs 2019–2021) among assignees with ≥5 patents in this subclass. Growth is company-wide; class patent counts are subclass-specific.

#1 Chengdu Qinchuan IOT Technology Co., Ltd. 20x 9 → 179 company-wide · 21 in G01F
#2 Enercorp Engineered Solutions, LLC 14x 1 → 14 company-wide · 9 in G01F
#3 Terumo BCT Biotechnologies, LLC 11x 1 → 11 company-wide · 7 in G01F
#4 Perceptive Sensor Technologies, Inc. 7.00x 2 → 14 company-wide · 9 in G01F
#5 Flusso Limited 7.00x 1 → 7 company-wide · 7 in G01F

G01F grants by year, peak 2020 (1,277)

US utility-patent grants per year in G01F, 2015–2025 - recent five years are up 9% versus 2015–2019.

Endress+Hauser Flowtec

279
Deka Products…

187
Vega Grieshaber Kg

180
Micro Motion

175
Saudi Arabian Oil

130
Endress+Hauser Se+ Kg

124
Hitachi Automotive…

118
Schlumberger…

96
Rosemount Tank Radar…

95
Krohne

69
Krohne Messtechnik

66
Rosemount

61

What this shows Endress+Hauser Flowtec is the most active filer in G01F, holding 279 of the 10,911 patents in this class. Concentration at the top signals how contestable this technology area is for new entrants.

View data table

Top patent holders in CPC subclass G01F
Rank	Company	Patents in G01F
#1	Endress+Hauser Flowtec AG	279
#2	Deka Products Limited Parternship	187
#3	Vega Grieshaber KG	180
#4	Micro Motion, Inc.	175
#5	Saudi Arabian OIL Company	130
#6	Endress+Hauser SE+Co. KG	124
#7	Hitachi Automotive Systems, Ltd.	118
#8	Schlumberger Technology Corporation	96
#9	Rosemount Tank Radar AB	95
#10	Krohne AG	69
#11	Krohne Messtechnik GmbH	66
#12	Rosemount Inc.	61
#13	Horiba Stec, Co., Ltd.	58
#14	ENDRESS+HAUSER GMBH+CO.KG	56
#15	Fujikin Incorporated	45
#16	Mueller International, LLC	44
#17	Rosemount Aerospace Inc.	41
#18	Cameron International Corporation	39
#19	Azbil Corporation	35
#20	Yokogawa Electric Corporation	34

Footprint here vs. claim strategy

Each dot is a leading G01F assignee, placed by how many patents it holds in this class (horizontal) against its company-wide average claims per patent (vertical) - a read on whether the class is led by broad-but-shallow filers or focused deep-claim players.

Top 14 G01F assignees by class footprint. Bubble size = patents in G01F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near G01F's 10,911-grant footprint

Nationwide nearest neighbors for G01F (#163 of 670 by volume ; lead share 2.6%) - not the G01 parent-class siblings above.

Nearest by grant volume

F02B 11,001 G09F 11,061 H02G 11,084 C09J 11,139

Nearest by lead-assignee share

G01C 2.6% F21V 2.6% A45F 2.6% G08B 2.6%

Questions about G01F

Which company holds the most patents in G01F?

Endress+Hauser Flowtec AG leads G01F with 279 patents (2.6% of the subclass). By PatentsView assignee type, foreign corporations account for 54% of class grants.

Which G01F assignees grew fastest recently?

Among assignees with ≥5 grants in G01F, Chengdu Qinchuan IOT Technology Co., Ltd. shows the highest company-wide grant multiple (20x: 9 grants in 2019–2021 → 179 in 2022–2024) while holding 21 patents in this subclass. Growth is company-wide, not class-only.

How does G01F compare inside parent class G01?

Inside G01 (MEASURING; Testing), G01F ranks #11 of 18 subclasses by grant volume and holds 2.8% of the parent class total. The largest sibling is G01N (115,972 grants).

What to do with this data

G01F in context - here's where to go next.

Endress+Hauser Flowtec AG leads G01F with 279 grants in this class. See full portfolio
G01F ranks #163 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class G01, the largest sibling subclass is G01N with 115,972 grants. Explore G01N

Figures reflect USPTO PatentsView grant data through 2026-05-15; pending applications not yet granted are not counted.

Methodology - G01F figures are USPTO PatentsView granted-utility totals for this subclass (10,911 grants in the tracked window).

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.