E21B 43/127
Adaptations of walking-beam pump systems
Official title: {Adaptations of walking-beam pump systems}
E21B43/127 (Adaptations of walking-beam pump systems) appears on 414 US grants and 416 published applications in this corpus.
Search patents in E21B- Granted patents
- 414
- Published applications
- 416
- Assignees
- 223
- Inventors
- 723
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 7 | 0 |
| 1996 | 9 | 0 |
| 1997 | 7 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 1 |
| 2002 | 3 | 2 |
| 2003 | 5 | 4 |
| 2004 | 2 | 3 |
| 2005 | 2 | 2 |
| 2006 | 1 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 1 | 2 |
| 2010 | 3 | 9 |
| 2011 | 4 | 11 |
| 2012 | 7 | 10 |
| 2013 | 6 | 17 |
| 2014 | 4 | 7 |
| 2015 | 15 | 22 |
| 2016 | 9 | 26 |
| 2017 | 13 | 36 |
| 2018 | 38 | 25 |
| 2019 | 22 | 35 |
| 2020 | 30 | 41 |
| 2021 | 38 | 38 |
| 2022 | 41 | 36 |
| 2023 | 27 | 25 |
| 2024 | 17 | 25 |
| 2025 | 25 | 23 |
| 2026 | 12 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Control unit for oil wells145US 4,102,394 AEnergy 76, Inc. · 1978
- Control system and method for AC motor driven cyclic load118US 4,971,522 A1990
- Tubing pump system for pumping well fluids94US 5,765,639 AMuth Pump LLC · 1998
- Well pump control system81US 5,281,100 AA.M.C. Technology, Inc. · 1994
- Speed control79US 4,145,161 AStandard Oil Company (Indiana) · 1979