E21B 10/28
With non-expansible roller cutters
Official title: with non-expansible roller cutters
E21B10/28 (With non-expansible roller cutters) appears on 184 US grants and 100 published applications in this corpus.
Search patents in E21B- Granted patents
- 184
- Published applications
- 100
- Assignees
- 85
- Inventors
- 265
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 11 | 0 |
| 1978 | 7 | 0 |
| 1979 | 2 | 0 |
| 1980 | 10 | 0 |
| 1981 | 8 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 7 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 6 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 1 |
| 2002 | 5 | 2 |
| 2003 | 3 | 1 |
| 2004 | 1 | 3 |
| 2005 | 1 | 2 |
| 2006 | 3 | 3 |
| 2007 | 2 | 1 |
| 2008 | 1 | 2 |
| 2009 | 1 | 5 |
| 2010 | 5 | 6 |
| 2011 | 3 | 6 |
| 2012 | 3 | 2 |
| 2013 | 4 | 6 |
| 2014 | 1 | 2 |
| 2015 | 3 | 4 |
| 2016 | 3 | 11 |
| 2017 | 6 | 7 |
| 2018 | 4 | 4 |
| 2019 | 8 | 7 |
| 2020 | 5 | 3 |
| 2021 | 7 | 9 |
| 2022 | 7 | 2 |
| 2023 | 4 | 4 |
| 2024 | 2 | 3 |
| 2025 | 5 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Splined/grooved 2 piece bit assembly16 Jun 2026US 12,655,693 B2Halliburton Energy Services.Inc.
- Wear support assemblies for raise boring tools9 Sep 2025US 12,410,665 B2Sandvik Mining and Construction Tools AB
- Slimline stop collar with seal to prevent micro-annulus leakage29 Apr 2025US 12,286,845 B2Downhole Products Limited
- Splined/grooved 2 piece bit assembly4 Mar 2025US 12,241,311 B2Halliburton Energy Services.Inc.
- Downhole traction tool and method of use18 Feb 2025US 12,227,997 B2Innovative Drilling Systems Limited
- Splined/grooved 2 piece bit assembly30 Apr 2026US 2026/0117594 A1Halliburton Energy Services.Inc.
- Connector assembly for use with microtunneling apparatus27 Nov 2025US 2025/0361777 A1
- Slimline stop collar with seal to prevent micro-annulus leakage20 Mar 2025US 2025/0092743 A1Downhole Products Limited
- Reamer Drill Bit Device9 Jan 2025US 2025/0012151 A1
- Splined/grooved 2 piece bit assembly12 Dec 2024US 2024/0410230 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Centered-leg roller cone drill bit157US 6,439,326 B1Smith International, Inc. · 2002
- Cutter head for pit-boring machine116US 4,448,269 AHitachi Construction Machinery Co., Ltd. · 1984
- Excavation bit for a drilling apparatus90US 6,533,050 B22003
- Roller pipe burster85US 6,568,488 B2Earth Tool Company, L.L.C. · 2003
- Drill bit with gage definition region70US 6,123,160 ABaker Hughes Incorporated · 2000