F04D 15/029
For pumps operating in parallel
Official title: {for pumps operating in parallel}
F04D15/029 (For pumps operating in parallel) appears on 127 US grants and 124 published applications in this corpus.
Search patents in F04D- Granted patents
- 127
- Published applications
- 124
- Assignees
- 80
- Inventors
- 245
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 2 |
| 2003 | 2 | 3 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 1 | 0 |
| 2007 | 1 | 4 |
| 2008 | 0 | 1 |
| 2009 | 2 | 4 |
| 2010 | 1 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 3 | 5 |
| 2014 | 1 | 8 |
| 2015 | 5 | 6 |
| 2016 | 2 | 2 |
| 2017 | 7 | 4 |
| 2018 | 3 | 9 |
| 2019 | 6 | 14 |
| 2020 | 15 | 7 |
| 2021 | 11 | 11 |
| 2022 | 5 | 9 |
| 2023 | 7 | 12 |
| 2024 | 11 | 8 |
| 2025 | 9 | 7 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for providing at least one item of information relating to a hydraulic system25 Aug 2026US 12,716,433 B2KSB SE & Co. KGaA
- Twin pump unit casing having motor mounted touchscreens28 Jul 2026US 12,692,869 B2S. A. Armstrong Limited
- Method of starting and stopping pump apparatuses coupled in series7 Apr 2026US 12,595,799 B2Ebara Corporation
- Self-regulating open circuit pump unit13 Jan 2026US 12,523,229 B2S. A. Armstrong Limited
- Method for operating a wastewater-lifting system14 Oct 2025US 12,442,174 B2KSB SE & Co. KGaA
- Twin Pump Unit Casing Having Motor Mounted Touchscreens1 Oct 2026US 2026/0298247 A1S. A. Armstrong Limited
- Control device and pump apparatus30 Jul 2026US 2026/0218711 A1
- Load-balancing functionality in a pump unit18 Jun 2026US 2026/0173328 A1
- Variable Frequency Drive (VFD) Controllers With Engine Failover And Systems Including The Same18 Dec 2025US 2025/0385511 A1Cattron North America, Inc.
- Method of starting and stopping pump apparatuses coupled in series6 Nov 2025US 2025/0341215 A1Ebara Corporation
Most cited
By later US patents
- Pumping facilities and control systems171US 10,711,787 B1W. S. Darley & Co. · 2020
- Pump station control system and method118US 6,178,393 B12001
- System for sequencing chillers in a loop cooling plant and other systems that employ all variable-speed units104US 6,185,946 B12001
- Sump pump control system96US 4,222,711 AI.sup.2 DS · 1980
- Variable frequency drive system for fluid delivery system82US 5,522,707 AMetropolitan Industries, Inc. · 1996