F04D 15/0218
The condition being a liquid level or a lack of liquid supply
Official title: {the condition being a liquid level or a lack of liquid supply}
F04D15/0218 (The condition being a liquid level or a lack of liquid supply) appears on 389 US grants and 391 published applications in this corpus.
Search patents in F04D- Granted patents
- 389
- Published applications
- 391
- Assignees
- 210
- Inventors
- 652
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 6 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 5 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 7 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 6 | 0 |
| 1997 | 4 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 6 | 0 |
| 2002 | 14 | 11 |
| 2003 | 8 | 4 |
| 2004 | 4 | 3 |
| 2005 | 1 | 7 |
| 2006 | 5 | 10 |
| 2007 | 5 | 14 |
| 2008 | 6 | 30 |
| 2009 | 5 | 22 |
| 2010 | 15 | 19 |
| 2011 | 10 | 14 |
| 2012 | 8 | 12 |
| 2013 | 19 | 14 |
| 2014 | 12 | 19 |
| 2015 | 9 | 27 |
| 2016 | 25 | 6 |
| 2017 | 19 | 28 |
| 2018 | 8 | 20 |
| 2019 | 23 | 18 |
| 2020 | 15 | 16 |
| 2021 | 20 | 14 |
| 2022 | 16 | 22 |
| 2023 | 17 | 19 |
| 2024 | 20 | 17 |
| 2025 | 20 | 15 |
| 2026 | 3 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Stick pump assembly1 Sep 2026US 12,723,590 B2Milwaukee Electric Tool Corporation
- Determining and utilizing a desired frequency for a mechanical shaker for a sump pump system16 Jun 2026US 12,655,849 B2State Farm Mutual Automobile Insurance Company
- Safety controls for electrical submersible pump systems28 Apr 2026US 12,612,917 B1Halliburton Energy Services.Inc.
- Enhanced dual float switch with illumination and switch discrimination28 Oct 2025US 12,454,955 B1Glentronics, Inc.
- Hydraulic system for a household appliance21 Oct 2025US 12,448,973 B2Copreci, S. Coop.
- Pump with anti-rotation function1 Oct 2026US 2026/0298252 A1Junsky Appliances Limited
- Method for Checking the Properties of a Conveyed Medium of a Centrifugal Pump, in Particular for Detecting a Dry Run6 Aug 2026US 2026/0226903 A1KSB SE & Co. KGaA
- Control device and pump apparatus30 Jul 2026US 2026/0218711 A1
- System for abnormal condition detection using nearest neighbor2 Jul 2026US 2026/0185904 A1Resideo LLC
- Method and system for controlling a fluid pressure in a fluid system25 Jun 2026US 2026/0174949 A1
Most cited
By later US patents
- Automatic pump protection system333US 4,913,625 AWestinghouse Electric Corp. · 1990
- Electric motor187US 9,570,945 B2Grundfos Holding A/S · 2017
- Apparatus and method for monitoring a sump pump173US 5,672,050 ALynx Electronics, Inc. · 1997
- Method of operating variable-speed submersible pump unit153US 6,481,973 B1Little Giant Pump Company · 2002
- Pump control responsive to timer, delay circuit and motor current112US 5,076,763 ARule Industries, Inc. · 1991