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E21B 23/0423

Using step motors

Official title: {using step motors}

E21B23/0423 (Using step motors) appears on 11 US grants and 6 published applications in this corpus.

Search patents in E21B

Granted patents: 11
Published applications: 6
Assignees: 6
Inventors: 10
Latest grant: 30 Dec 2025

Filings by year

E21B 23/0423: granted patents and published applications per publication 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	1	0
1988	0	0
1989	0	0
1990	0	0
1991	0	0
1992	0	0
1993	1	0
1994	0	0
1995	1	0
1996	0	0
1997	1	0
1998	2	0
1999	0	0
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	0	0
2009	0	0
2010	0	0
2011	0	0
2012	0	0
2013	0	0
2014	0	0
2015	0	0
2016	0	0
2017	0	0
2018	0	0
2019	0	0
2020	0	0
2021	0	1
2022	1	1
2023	0	1
2024	1	1
2025	2	1
2026	0	1

By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.

Recent patents

System and method for electrical control of downhole well tools30 Dec 2025US 12,509,961 B2Weatherford Technology Holdings, LLC
Synchronized actuator having multiple motors for downhole well tool27 May 2025US 12,312,909 B2Weatherford Technology Holdings, LLC
Service tool string with perforating gun assembly positioning tool13 Aug 2024US 12,060,779 B2Halliburton Energy Services.Inc.
System and method for electrical control of downhole well tools28 Jun 2022US 11,371,318 B2Weatherford Technology Holdings, LLC
Drill string orienting motor7 Jul 1998US 5,775,444 A

Most cited

By later US patents