G01F 23/26
By measuring variations of capacity or inductance of capacitors or inductors arising
Official title: by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
G01F23/26 (By measuring variations of capacity or inductance of capacitors or inductors arising) appears on 1,505 US grants and 1,367 published applications in this corpus.
Search patents in G01F- Granted patents
- 1,505
- Published applications
- 1,367
- Assignees
- 914
- Inventors
- 3,159
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 12 | 0 |
| 1978 | 15 | 0 |
| 1979 | 21 | 0 |
| 1980 | 17 | 0 |
| 1981 | 15 | 0 |
| 1982 | 18 | 0 |
| 1983 | 18 | 0 |
| 1984 | 29 | 0 |
| 1985 | 21 | 0 |
| 1986 | 16 | 0 |
| 1987 | 14 | 0 |
| 1988 | 10 | 0 |
| 1989 | 18 | 0 |
| 1990 | 21 | 0 |
| 1991 | 26 | 0 |
| 1992 | 22 | 0 |
| 1993 | 19 | 0 |
| 1994 | 10 | 0 |
| 1995 | 17 | 0 |
| 1996 | 23 | 0 |
| 1997 | 24 | 0 |
| 1998 | 19 | 0 |
| 1999 | 20 | 0 |
| 2000 | 20 | 0 |
| 2001 | 32 | 4 |
| 2002 | 27 | 16 |
| 2003 | 27 | 20 |
| 2004 | 24 | 31 |
| 2005 | 22 | 43 |
| 2006 | 28 | 27 |
| 2007 | 19 | 34 |
| 2008 | 24 | 38 |
| 2009 | 17 | 48 |
| 2010 | 24 | 48 |
| 2011 | 26 | 41 |
| 2012 | 26 | 38 |
| 2013 | 29 | 69 |
| 2014 | 36 | 45 |
| 2015 | 47 | 41 |
| 2016 | 51 | 63 |
| 2017 | 47 | 77 |
| 2018 | 59 | 75 |
| 2019 | 66 | 93 |
| 2020 | 57 | 78 |
| 2021 | 82 | 102 |
| 2022 | 68 | 79 |
| 2023 | 58 | 71 |
| 2024 | 60 | 61 |
| 2025 | 50 | 73 |
| 2026 | 34 | 52 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fluid measuring reservoir for breast pumps6 Oct 2026US 12,754,055 B2Willow Innovations, Inc.
- Measuring water level in highly deviated or horizontal hydrocarbon well sections15 Sep 2026US 12,735,978 B2Openfield
- Fill level gauge15 Sep 2026US 12,736,385 B2Endress + Hauser GmbH + Co. KG
- Liquid beverage flow meter able to distinguish air18 Aug 2026US 12,710,297 B2
- Automated sample handling instrumentation, systems, processes, and methods4 Aug 2026US 12,699,111 B2Gen-Probe Incorporated
- 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
- Liquid storage tank, liquid circulation device, recording apparatus including liquid circulation device, and liquid storage tank group1 Oct 2026US 2026/0296045 A1KYOCERA Corporation
- Capacitive detection device and methods24 Sep 2026US 2026/0287410 A1Beckman Coulter, Inc.
- Sewer cap monitoring system17 Sep 2026US 2026/0276427 A1QuadSprout Technologies LLC
Most cited
By later US patents
- Inductance-based dose measurement in syringes551US 6,068,615 AHealth Hero Network, Inc. · 2000
- Apparatus for determining and recording injection doses in syringes using electrical inductance400US 5,782,814 ARaya Systems, Inc. · 1998
- Level sensing372US 6,457,355 B12002
- Method and device for determining the quantity of product present in a reservoir, a product reservoir and a device for processing electrical signals intended for such a determination device204US 6,345,532 B1Canon Kabushiki Kaisha · 2002
- Capacitance-type fluid level sensor for i.v. and catheter bags202US 5,135,485 A1992