F04B 49/225
With throttling valves or valves varying the pump inlet opening or the
Official title: {with throttling valves or valves varying the pump inlet opening or the outlet opening}
F04B49/225 (With throttling valves or valves varying the pump inlet opening or the) appears on 413 US grants and 332 published applications in this corpus.
Search patents in F04B- Granted patents
- 413
- Published applications
- 332
- Assignees
- 241
- Inventors
- 851
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 8 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 9 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 10 | 0 |
| 1997 | 9 | 0 |
| 1998 | 8 | 0 |
| 1999 | 3 | 0 |
| 2000 | 16 | 0 |
| 2001 | 18 | 2 |
| 2002 | 14 | 5 |
| 2003 | 14 | 12 |
| 2004 | 10 | 18 |
| 2005 | 6 | 9 |
| 2006 | 8 | 8 |
| 2007 | 2 | 5 |
| 2008 | 3 | 12 |
| 2009 | 7 | 12 |
| 2010 | 8 | 10 |
| 2011 | 7 | 9 |
| 2012 | 7 | 5 |
| 2013 | 6 | 7 |
| 2014 | 5 | 18 |
| 2015 | 9 | 17 |
| 2016 | 12 | 23 |
| 2017 | 14 | 19 |
| 2018 | 21 | 28 |
| 2019 | 19 | 22 |
| 2020 | 22 | 19 |
| 2021 | 17 | 20 |
| 2022 | 18 | 12 |
| 2023 | 20 | 15 |
| 2024 | 14 | 8 |
| 2025 | 12 | 8 |
| 2026 | 7 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Refueling method for supplying fuel to fracturing equipment185US 9,856,131 B12018
- Method for manipulating dosage control apparatus182US 6,966,325 B2Advanced Neuromodulation Systems, Inc. · 2005
- Positive-displacement type pump system119US 5,167,493 ANissan Motor Co., Ltd. · 1992
- Semi-automatic compressor controller and method of controlling a compressor110US 6,068,447 AStandard Pneumatic Products, Inc. · 2000
- Pump assembly useful in internal combustion engines99US 6,669,453 B12003