G01F 23/24
By measuring variations of resistance of resistors due to contact with conductor
Official title: by measuring variations of resistance of resistors due to contact with conductor fluid
G01F23/24 (By measuring variations of resistance of resistors due to contact with conductor) appears on 1,104 US grants and 791 published applications in this corpus.
Search patents in G01F- Granted patents
- 1,104
- Published applications
- 791
- Assignees
- 674
- Inventors
- 2,194
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 23 | 0 |
| 1977 | 23 | 0 |
| 1978 | 16 | 0 |
| 1979 | 15 | 0 |
| 1980 | 23 | 0 |
| 1981 | 15 | 0 |
| 1982 | 13 | 0 |
| 1983 | 16 | 0 |
| 1984 | 17 | 0 |
| 1985 | 14 | 0 |
| 1986 | 20 | 0 |
| 1987 | 17 | 0 |
| 1988 | 26 | 0 |
| 1989 | 22 | 0 |
| 1990 | 23 | 0 |
| 1991 | 26 | 0 |
| 1992 | 30 | 0 |
| 1993 | 22 | 0 |
| 1994 | 15 | 0 |
| 1995 | 17 | 0 |
| 1996 | 21 | 0 |
| 1997 | 19 | 0 |
| 1998 | 22 | 0 |
| 1999 | 15 | 0 |
| 2000 | 11 | 0 |
| 2001 | 13 | 3 |
| 2002 | 5 | 16 |
| 2003 | 27 | 19 |
| 2004 | 18 | 21 |
| 2005 | 18 | 29 |
| 2006 | 21 | 28 |
| 2007 | 19 | 33 |
| 2008 | 16 | 25 |
| 2009 | 15 | 25 |
| 2010 | 17 | 27 |
| 2011 | 22 | 29 |
| 2012 | 16 | 25 |
| 2013 | 23 | 38 |
| 2014 | 19 | 39 |
| 2015 | 28 | 35 |
| 2016 | 36 | 33 |
| 2017 | 28 | 34 |
| 2018 | 36 | 38 |
| 2019 | 38 | 54 |
| 2020 | 44 | 48 |
| 2021 | 35 | 49 |
| 2022 | 42 | 29 |
| 2023 | 29 | 34 |
| 2024 | 31 | 28 |
| 2025 | 18 | 31 |
| 2026 | 9 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dual-use level and temperature probe6 Oct 2026US 12,754,081 B2Goodrich Corporation
- Fill level gauge15 Sep 2026US 12,736,385 B2Endress + Hauser GmbH + Co. KG
- Systems and methods for tank level monitoring4 Aug 2026US 12,698,997 B2Copeland Comfort Control LP
- Devices, systems, and methods for controlling liquid levels using isolation resistance14 Jul 2026US 12,681,509 B2Trane International Inc.
- Biosensor9 Jun 2026US 12,650,400 B2Leadway (Hk) Limited
- Inkjet recording apparatus8 Oct 2026US 2026/0307392 A1KYOCERA Document Solutions Inc.
- Devices, systems, and methods for controlling liquid levels using isolation resistance8 Oct 2026US 2026/0310244 A1Trane International Inc.
- Liquid ejecting apparatus and liquid accommodating device1 Oct 2026US 2026/0296042 A1Seiko Epson Corporation
- Device for sensing remaining amount of detergent in washing machine1 Oct 2026US 2026/0298689 A1Dsw Inc.
- Apparatus for detecting remaining amount of detergent in washing machine24 Sep 2026US 2026/0287409 A1
Most cited
By later US patents
- Fluid indicator for a containment vessel288US 4,880,982 AImpex Production & Development A/S (Ltd.) · 1989
- Wireless system for detecting and stopping water leaks209US 5,655,561 A1997
- Product dispensing controlled by RFID tags167US 7,009,519 B2S. C. Johnson & Sons, Inc. · 2006
- Fluid monitoring apparatus and method148US 7,878,058 B2Walker Engineering Company · 2011
- Method and apparatus for sensing liquid level using baseline characteristic105US 7,360,418 B2Keurig, Incorporated · 2008