F04D 15/0236
Lack of liquid level being detected by analysing the parameters of the
Official title: {Lack of liquid level being detected by analysing the parameters of the electric drive, e.g. current or power consumption}
F04D15/0236 (Lack of liquid level being detected by analysing the parameters of the) appears on 90 US grants and 108 published applications in this corpus.
Search patents in F04D- Granted patents
- 90
- Published applications
- 108
- Assignees
- 65
- Inventors
- 147
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 3 |
| 2003 | 2 | 2 |
| 2004 | 2 | 1 |
| 2005 | 1 | 3 |
| 2006 | 0 | 2 |
| 2007 | 1 | 3 |
| 2008 | 0 | 17 |
| 2009 | 3 | 7 |
| 2010 | 8 | 7 |
| 2011 | 5 | 3 |
| 2012 | 4 | 1 |
| 2013 | 6 | 1 |
| 2014 | 4 | 7 |
| 2015 | 0 | 7 |
| 2016 | 3 | 3 |
| 2017 | 3 | 4 |
| 2018 | 2 | 6 |
| 2019 | 8 | 4 |
| 2020 | 7 | 6 |
| 2021 | 3 | 3 |
| 2022 | 5 | 4 |
| 2023 | 5 | 3 |
| 2024 | 3 | 3 |
| 2025 | 2 | 3 |
| 2026 | 1 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Automatic pump protection system333US 4,913,625 AWestinghouse Electric Corp. · 1990
- 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
- Soft-start pump control system110US 5,545,012 ARule Industries, Inc. · 1996
- Digital logic control system for three-phase submersible pump motor107US 4,021,700 ABorg-Warner Corporation · 1977