E21B 49/001
Testing the nature of borehole walls: specially adapted for underwater installations
Official title: {specially adapted for underwater installations}
E21B49/001 (Testing the nature of borehole walls: specially adapted for underwater installations) appears on 108 US grants and 41 published applications in this corpus.
Search patents in E21B- Granted patents
- 108
- Published applications
- 41
- Assignees
- 42
- Inventors
- 145
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 5 | 0 |
| 1978 | 8 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 1 | 0 |
| 1984 | 8 | 0 |
| 1985 | 7 | 0 |
| 1986 | 8 | 0 |
| 1987 | 11 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 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 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 3 |
| 2011 | 0 | 0 |
| 2012 | 0 | 3 |
| 2013 | 0 | 2 |
| 2014 | 2 | 1 |
| 2015 | 2 | 4 |
| 2016 | 3 | 4 |
| 2017 | 2 | 3 |
| 2018 | 3 | 1 |
| 2019 | 3 | 3 |
| 2020 | 4 | 4 |
| 2021 | 3 | 0 |
| 2022 | 1 | 5 |
| 2023 | 2 | 2 |
| 2024 | 3 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
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- Full bore sampler valve77US 4,576,234 ASchlumberger Technology Corporation · 1986
- Pressure controlled reversing valve68US 3,986,554 ASchlumberger Technology Corporation · 1976
- Ball operated J-slot64US 4,355,685 AHalliburton Services · 1982