G01F 25/00
Testing or calibration of apparatus for measuring volume, volume flow or liquid
Official title: Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
G01F25/00 (Testing or calibration of apparatus for measuring volume, volume flow or liquid) appears on 2,620 US grants and 2,658 published applications in this corpus.
Search patents in G01F- Granted patents
- 2,620
- Published applications
- 2,658
- Assignees
- 1,272
- Inventors
- 5,114
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 4 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 10 | 0 |
| 1982 | 17 | 0 |
| 1983 | 11 | 0 |
| 1984 | 17 | 0 |
| 1985 | 17 | 0 |
| 1986 | 16 | 0 |
| 1987 | 14 | 0 |
| 1988 | 12 | 0 |
| 1989 | 21 | 0 |
| 1990 | 24 | 0 |
| 1991 | 21 | 0 |
| 1992 | 16 | 0 |
| 1993 | 31 | 0 |
| 1994 | 22 | 0 |
| 1995 | 34 | 0 |
| 1996 | 31 | 0 |
| 1997 | 32 | 0 |
| 1998 | 29 | 0 |
| 1999 | 19 | 0 |
| 2000 | 13 | 0 |
| 2001 | 19 | 3 |
| 2002 | 20 | 28 |
| 2003 | 34 | 37 |
| 2004 | 36 | 47 |
| 2005 | 35 | 60 |
| 2006 | 50 | 69 |
| 2007 | 49 | 64 |
| 2008 | 46 | 94 |
| 2009 | 56 | 94 |
| 2010 | 90 | 87 |
| 2011 | 69 | 72 |
| 2012 | 64 | 98 |
| 2013 | 60 | 96 |
| 2014 | 92 | 135 |
| 2015 | 86 | 113 |
| 2016 | 96 | 119 |
| 2017 | 112 | 178 |
| 2018 | 110 | 154 |
| 2019 | 152 | 161 |
| 2020 | 173 | 180 |
| 2021 | 129 | 162 |
| 2022 | 160 | 149 |
| 2023 | 125 | 141 |
| 2024 | 133 | 117 |
| 2025 | 101 | 119 |
| 2026 | 84 | 81 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01F 25/10Testing or calibration of apparatus for measuring volume, volume flow or liquid1,746
- G01F 25/20Testing or calibration of apparatus for measuring volume, volume flow or liquid621
- G01F 25/0092Testing or calibration of apparatus for measuring volume, volume flow or liquid218
- G01F 25/0084Testing or calibration of apparatus for measuring volume, volume flow or liquid109
Recent patents
- Dynamic calibration and correction of stroke volume of a pump6 Oct 2026US 12,754,059 B2Fenwal, Inc.
- Testing augmenation scheme by stipulating multi-phase flow meter (MFPM) engineering enhancement methodology “tassmeem”6 Oct 2026US 12,754,060 B2Saudi Arabian Oil Company
- Method and apparatus to determine utility usage29 Sep 2026US 12,747,977 B2Arad Measuring Technologies Ltd.
- Method for noise diagnosis, method for signal control, diagnosis device and radiomatic level measuring device29 Sep 2026US 12,747,978 B2VEGA Grieshaber KG
- Metering systems and methods22 Sep 2026US 12,742,671 B2Sur-Flo Meters & Controls Ltd.
- Methods for determining continuous gas supply time based on smart gas, internet of things (iot) systems and media thereof1 Oct 2026US 2026/0298418 A1Chengdu Qinchuan Iot Technology Co., Ltd.
- Digitally assisted microwave multiphase flow meter1 Oct 2026US 2026/0298693 A1King Abdullah University of Science and Technology
- Multiphase flowmeter (mpfm) liquid referencing vehicle1 Oct 2026US 2026/0298694 A1Saudi Arabian Oil Company
- Validating a reading from an analog flow meter1 Oct 2026US 2026/0301435 A1Waltero Holding AB
- Categorizing a discrepancy in a measurement readout of a flow meter24 Sep 2026US 2026/0287412 A1Waltero Holding AB
Most cited
By later US patents
- Delivery of aerosol medications for inspiration598US 5,404,871 AAradigm Corporation · 1995
- Systems and methods for mass flow controller verification509US 9,169,975 B2ASM IP Holding B. V. · 2015
- Liquid flow rate estimation and verification by direct liquid measurement507US 5,866,795 AAPPLIED Materials.Inc. · 1999
- Gas flow rate verification unit475US 7,716,993 B2Ckd Corporation · 2010
- System and method for gas flow verification474US 7,376,520 B2Lam Research Corporation · 2008