G01F 23/22
Indicating or measuring liquid level or level of fluent solid material: by
Official title: by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water (involving the use of floats G01F23/30)
G01F23/22 (Indicating or measuring liquid level or level of fluent solid material: by) appears on 6,313 US grants and 5,484 published applications in this corpus.
Search patents in G01F- Granted patents
- 6,313
- Published applications
- 5,484
- Assignees
- 2,787
- Inventors
- 11,190
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 58 | 0 |
| 1977 | 56 | 0 |
| 1978 | 54 | 0 |
| 1979 | 57 | 0 |
| 1980 | 70 | 0 |
| 1981 | 53 | 0 |
| 1982 | 59 | 0 |
| 1983 | 57 | 0 |
| 1984 | 75 | 0 |
| 1985 | 61 | 0 |
| 1986 | 76 | 0 |
| 1987 | 76 | 0 |
| 1988 | 79 | 0 |
| 1989 | 94 | 0 |
| 1990 | 94 | 0 |
| 1991 | 108 | 0 |
| 1992 | 93 | 0 |
| 1993 | 92 | 0 |
| 1994 | 66 | 0 |
| 1995 | 84 | 0 |
| 1996 | 80 | 0 |
| 1997 | 97 | 0 |
| 1998 | 126 | 0 |
| 1999 | 88 | 0 |
| 2000 | 94 | 0 |
| 2001 | 114 | 25 |
| 2002 | 96 | 115 |
| 2003 | 135 | 116 |
| 2004 | 118 | 140 |
| 2005 | 109 | 155 |
| 2006 | 109 | 141 |
| 2007 | 101 | 166 |
| 2008 | 103 | 172 |
| 2009 | 95 | 177 |
| 2010 | 121 | 191 |
| 2011 | 132 | 163 |
| 2012 | 120 | 165 |
| 2013 | 125 | 211 |
| 2014 | 169 | 230 |
| 2015 | 196 | 247 |
| 2016 | 200 | 269 |
| 2017 | 196 | 276 |
| 2018 | 226 | 319 |
| 2019 | 310 | 325 |
| 2020 | 289 | 307 |
| 2021 | 255 | 301 |
| 2022 | 232 | 279 |
| 2023 | 215 | 289 |
| 2024 | 244 | 271 |
| 2025 | 209 | 261 |
| 2026 | 147 | 173 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01F 23/28By measuring the variations of parameters of electromagnetic or acoustic waves applied3,912
- G01F 23/26By measuring variations of capacity or inductance of capacitors or inductors arising1,505
- G01F 23/24By measuring variations of resistance of resistors due to contact with conductor1,104
- G01F 23/226Measuring the braking of a rotatable element27
- G01F 23/223Using a melting or dissolving material as a part of alarm-means10
Recent patents
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- Fluid measuring reservoir for breast pumps6 Oct 2026US 12,754,055 B2Willow Innovations, Inc.
- Modular field device6 Oct 2026US 12,754,056 B2Endress + Hauser GmbH + Co. KG
- System and method of detecting fluid levels in tanks6 Oct 2026US 12,754,057 B2Plainsight Technologies Inc.
- Dual-use level and temperature probe6 Oct 2026US 12,754,081 B2Goodrich Corporation
- Inkjet recording apparatus8 Oct 2026US 2026/0307392 A1KYOCERA Document Solutions Inc.
- Measuring device for autonomous and wireless detection of fluid media in an environment8 Oct 2026US 2026/0309533 A1Arianegroup SAS
- Measuring assembly of a field device on a container8 Oct 2026US 2026/0309534 A1VEGA Grieshaber KG
- Method for determining the inner diameter of a surge pipe using a fill level measuring device8 Oct 2026US 2026/0309535 A1Endress + Hauser GmbH + Co. KG
- Signal processing for multi-sensor distance calculation and level measurement in a tank8 Oct 2026US 2026/0309536 A1Rosemount Tank Radar AB
Most cited
By later US patents
- Automatic liquid dispenser and refrigerator with the same865US 7,661,448 B2LG Electronics Inc. · 2010
- Optical identification and monitoring system using pattern recognition for use with vehicles656US 5,845,000 AAutomotive Technologies International, Inc. · 1998
- Reflection free launcher for electromagnetic guide wire602US 7,345,623 B2McEwan Technologies, LLC · 2008
- Vehicular component control systems and methods554US 6,442,465 B2Automotive Technologies International, Inc. · 2002
- Inductance-based dose measurement in syringes551US 6,068,615 AHealth Hero Network, Inc. · 2000