G01F 23/04
Indicating or measuring liquid level or level of fluent solid material: by
Official title: by dip members, e.g. dip-sticks
G01F23/04 (Indicating or measuring liquid level or level of fluent solid material: by) appears on 304 US grants and 176 published applications in this corpus.
Search patents in G01F- Granted patents
- 304
- Published applications
- 176
- Assignees
- 158
- Inventors
- 564
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 8 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 6 | 0 |
| 1981 | 6 | 0 |
| 1982 | 8 | 0 |
| 1983 | 8 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 9 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 10 | 0 |
| 1991 | 15 | 0 |
| 1992 | 7 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 7 | 0 |
| 2002 | 4 | 7 |
| 2003 | 8 | 7 |
| 2004 | 2 | 5 |
| 2005 | 1 | 8 |
| 2006 | 7 | 5 |
| 2007 | 6 | 9 |
| 2008 | 9 | 9 |
| 2009 | 6 | 6 |
| 2010 | 5 | 7 |
| 2011 | 3 | 8 |
| 2012 | 5 | 3 |
| 2013 | 2 | 8 |
| 2014 | 5 | 4 |
| 2015 | 7 | 5 |
| 2016 | 4 | 6 |
| 2017 | 11 | 12 |
| 2018 | 8 | 8 |
| 2019 | 6 | 10 |
| 2020 | 9 | 12 |
| 2021 | 8 | 7 |
| 2022 | 11 | 11 |
| 2023 | 9 | 4 |
| 2024 | 8 | 6 |
| 2025 | 4 | 6 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Density invariant displacer-type liquid level measurement utilizing differential pressure transmitter23 Jun 2026US 12,663,304 B2Saudi Arabian Oil Company
- Apparatus for handling and/or measuring a liquid contained in a container and an empty level indicator system for detecting a corresponding empty level12 May 2026US 12,624,981 B2Ecolab USA Inc.
- Emptying detection device, emptying system and emptying detection method21 Apr 2026US 12,607,494 B2Otto Id Solutions GmbH
- Systems and methods for determining sludge levels in wastewater reservoirs19 Aug 2025US 12,392,651 B2Drone Des Champs Inc.
- Monitoring fullness of containers15 Jul 2025US 12,359,955 B2Waste Harmonics, LLC
- Monitoring fullness of containers13 Aug 2026US 2026/0235430 A1Waste Harmonics, LLC
- Test dipstick for sealing an oil sump during an engine oil leak test18 Jun 2026US 2026/0168839 A1GM Global Technology Operations LLC
- Cable based detection of bulk aggregate1 Jan 2026US 2026/0002810 A1OPI Systems, Inc.
- Monitoring fullness of containers25 Sep 2025US 2025/0297878 A1Waste Harmonics, LLC
- Density invariant displacer-type liquid level measurement utilizing differential pressure transmitter4 Sep 2025US 2025/0277687 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Dielectric liquid level sensor and method87US 4,806,847 ACaterpillar Inc. · 1989
- Apparatus for indicating oil temperature and oil level within an oil reservoir85US 7,509,753 B2Harley-Davidson Motor Company Group, Inc. · 2009
- Oil level indicating system for internal combustion engine66US 7,373,912 B2Ford Global Technologies, LLC · 2008
- Vent cap for oil tanks of machines and the like equipped with splash guard56US 7,959,026 B2Elesa S.p.A. · 2011
- Fluid level measuring system for machines46US 6,577,959 B1Power Plus, Inc. · 2003