F04D 15/0227
Lack of liquid level being detected using a flow transducer
Official title: {Lack of liquid level being detected using a flow transducer}
F04D15/0227 (Lack of liquid level being detected using a flow transducer) appears on 43 US grants and 44 published applications in this corpus.
Search patents in F04D- Granted patents
- 43
- Published applications
- 44
- Assignees
- 26
- Inventors
- 46
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 3 |
| 2014 | 1 | 2 |
| 2015 | 0 | 13 |
| 2016 | 9 | 0 |
| 2017 | 5 | 1 |
| 2018 | 1 | 3 |
| 2019 | 2 | 2 |
| 2020 | 1 | 0 |
| 2021 | 3 | 1 |
| 2022 | 0 | 0 |
| 2023 | 4 | 1 |
| 2024 | 4 | 6 |
| 2025 | 6 | 6 |
| 2026 | 1 | 0 |
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 for the operation of a centrifugal pump89US 6,715,996 B2Danfoss Drives A/S · 2004
- Flow control74US 7,845,913 B2Pentair Water Pool and Spa, Inc. · 2010
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