G01F 25/20
Testing or calibration of apparatus for measuring volume, volume flow or liquid
Official title: of apparatus for measuring liquid level
G01F25/20 (Testing or calibration of apparatus for measuring volume, volume flow or liquid) appears on 621 US grants and 679 published applications in this corpus.
Search patents in G01F- Granted patents
- 621
- Published applications
- 679
- Assignees
- 385
- Inventors
- 1,373
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 5 | 0 |
| 1993 | 7 | 0 |
| 1994 | 6 | 0 |
| 1995 | 8 | 0 |
| 1996 | 8 | 0 |
| 1997 | 9 | 0 |
| 1998 | 7 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 7 |
| 2003 | 9 | 5 |
| 2004 | 5 | 10 |
| 2005 | 8 | 14 |
| 2006 | 11 | 14 |
| 2007 | 10 | 11 |
| 2008 | 13 | 27 |
| 2009 | 11 | 22 |
| 2010 | 20 | 19 |
| 2011 | 20 | 9 |
| 2012 | 15 | 25 |
| 2013 | 9 | 23 |
| 2014 | 20 | 30 |
| 2015 | 24 | 30 |
| 2016 | 23 | 34 |
| 2017 | 33 | 56 |
| 2018 | 32 | 38 |
| 2019 | 41 | 45 |
| 2020 | 39 | 44 |
| 2021 | 38 | 60 |
| 2022 | 48 | 35 |
| 2023 | 27 | 33 |
| 2024 | 32 | 22 |
| 2025 | 23 | 40 |
| 2026 | 17 | 26 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for noise diagnosis, method for signal control, diagnosis device and radiomatic level measuring device29 Sep 2026US 12,747,978 B2VEGA Grieshaber KG
- Infrared vision positioning method for concrete pumping liquid level in tube of steel tubular arch bridge8 Sep 2026US 12,729,995 B2Chongqing Jiaotong University
- Calibration of modular fill-level gauges8 Sep 2026US 12,729,997 B2Endress + Hauser GmbH + Co. KG
- Method and device for detecting an impairment of a lever sensor18 Aug 2026US 12,710,305 B2Bayerische Motoren Werke Aktiengesellschaft
- Energy transfer from a drum to a displacement element11 Aug 2026US 12,704,107 B2Honeywell International Inc.
- Radiometric detector24 Sep 2026US 2026/0287413 A1Endress + Hauser GmbH + Co. KG
- Apparatus for in situ level and flow measurement17 Sep 2026US 2026/0276429 A1Pulsar Process Measurement Limited
- Machine learning-based fuel quantity indication system for an aircraft27 Aug 2026US 2026/0250008 A1The Boeing Company
- Fill volume determination for tiltable containers13 Aug 2026US 2026/0235431 A1Endress + Hauser GmbH + Co. KG
- Method for defining a filling level measurement range13 Aug 2026US 2026/0235432 A1Endress + Hauser GmbH + Co. KG
Most cited
By later US patents
- Fluid volume sensor195US 5,303,585 AJTL Medical Corporation · 1994
- Controller for ultrasonic sensors181US 5,437,178 AKay-Ray/Sensall, Inc. · 1995
- Container and adaptor for use with fluid volume sensor125US 5,586,085 A1996
- Dielectric liquid level sensor and method87US 4,806,847 ACaterpillar Inc. · 1989
- Analog hall-effect liquid level detector and method87US 5,636,548 ATesoro Alaska Petroleum Company · 1997