E21B 10/02
Core bits
Official title: Core bits (characterised by wear resisting parts E21B10/48)
E21B10/02 (Core bits) appears on 284 US grants and 224 published applications in this corpus.
Search patents in E21B- Granted patents
- 284
- Published applications
- 224
- Assignees
- 137
- Inventors
- 507
- Latest grant
- 3 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 6 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 2 | 0 |
| 1984 | 6 | 0 |
| 1985 | 6 | 0 |
| 1986 | 0 | 0 |
| 1987 | 10 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 5 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 4 | 0 |
| 1995 | 8 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 1 |
| 2003 | 3 | 3 |
| 2004 | 1 | 4 |
| 2005 | 1 | 0 |
| 2006 | 2 | 5 |
| 2007 | 0 | 4 |
| 2008 | 3 | 3 |
| 2009 | 3 | 2 |
| 2010 | 2 | 12 |
| 2011 | 6 | 9 |
| 2012 | 2 | 8 |
| 2013 | 5 | 14 |
| 2014 | 7 | 11 |
| 2015 | 8 | 23 |
| 2016 | 11 | 18 |
| 2017 | 11 | 13 |
| 2018 | 17 | 16 |
| 2019 | 12 | 17 |
| 2020 | 22 | 11 |
| 2021 | 15 | 15 |
| 2022 | 11 | 18 |
| 2023 | 11 | 8 |
| 2024 | 12 | 4 |
| 2025 | 3 | 5 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Determining fracture roughness from a core3 Feb 2026US 12,540,884 B2Saudi Arabian Oil Company
- Downhole rock mechanics characterisation tool, assembly and method20 Jan 2026US 12,529,309 B2ENI S. p. A.
- Continuous sampling drill bit23 Sep 2025US 12,421,804 B2Veracio Ltd.
- Wellbore operations system and method29 Jul 2025US 12,371,967 B2Saudi Arabian Oil Company
- Sidewall coring tool systems and methods8 Jul 2025US 12,352,161 B2Schlumberger Technology Corporation
- Continuous Sampling Drill Bit30 Oct 2025US 2025/0334007 A1Veracio Ltd.
- Method for releasing and tightening a screw connection between a core drilling device and a core bit, and core drilling device16 Oct 2025US 2025/0319523 A1Hilti Aktiengesellschaft
- Sidewall coring tools having active circulation features16 Oct 2025US 2025/0320816 A1Schlumberger Technology Corporation
- Determining Fracture Roughness from a Core13 Feb 2025US 2025/0052644 A1Saudi Arabian Oil Company
- Method for taking a core sample of a formation2 Jan 2025US 2025/0003311 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Combination drill bit328US 5,016,718 A1991
- Bit-stabilized combination coring and drilling system142US 5,568,838 ABaker Hughes Incorporated · 1996
- Self-centering polycrystalline diamond cutting rock bit135US 5,655,614 ASmith International, Inc. · 1997
- Rotary drill bit96US 4,640,374 AStrata Bit Corporation · 1987
- Rotary drill bit95US 4,538,691 AStrata Bit Corporation · 1985