E21B 49/003

Testing the nature of borehole walls: by analysing drilling variables or conditions

Official title: {by analysing drilling variables or conditions (E21B49/005 takes precedence; systems specially adapted for monitoring a plurality of drilling variables or conditions E21B44/00)}

E21B49/003 (Testing the nature of borehole walls: by analysing drilling variables or conditions) appears on 535 US grants and 605 published applications in this corpus.

Search patents in E21B

Granted patents: 535
Published applications: 605
Assignees: 170
Inventors: 1,319
Latest grant: 22 Sep 2026

Filings by year

E21B 49/003: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	1	0
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	2	0
1988	2	0
1989	4	0
1990	1	0
1991	1	0
1992	3	0
1993	2	0
1994	2	0
1995	1	0
1996	0	0
1997	1	0
1998	3	0
1999	1	0
2000	2	0
2001	2	1
2002	6	0
2003	2	5
2004	3	6
2005	2	4
2006	4	3
2007	3	5
2008	2	0
2009	1	2
2010	6	8
2011	2	4
2012	2	10
2013	6	14
2014	9	12
2015	17	57
2016	13	53
2017	30	53
2018	47	39
2019	48	47
2020	48	58
2021	46	57
2022	56	51
2023	63	48
2024	46	34
2025	24	18
2026	20	16

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

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