E21B 10/58
Chisel-type inserts
Official title: Chisel-type inserts ({E21B10/485,} E21B10/52 take precedence)
E21B10/58 (Chisel-type inserts) appears on 241 US grants and 93 published applications in this corpus.
Search patents in E21B- Granted patents
- 241
- Published applications
- 93
- Assignees
- 97
- Inventors
- 342
- Latest grant
- 27 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 8 | 0 |
| 1983 | 7 | 0 |
| 1984 | 12 | 0 |
| 1985 | 9 | 0 |
| 1986 | 5 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 7 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 11 | 0 |
| 1994 | 8 | 0 |
| 1995 | 8 | 0 |
| 1996 | 2 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 3 | 0 |
| 2000 | 10 | 0 |
| 2001 | 5 | 1 |
| 2002 | 6 | 5 |
| 2003 | 3 | 5 |
| 2004 | 2 | 12 |
| 2005 | 9 | 0 |
| 2006 | 7 | 5 |
| 2007 | 2 | 4 |
| 2008 | 1 | 4 |
| 2009 | 1 | 1 |
| 2010 | 5 | 6 |
| 2011 | 4 | 2 |
| 2012 | 3 | 3 |
| 2013 | 2 | 6 |
| 2014 | 3 | 8 |
| 2015 | 7 | 3 |
| 2016 | 7 | 5 |
| 2017 | 2 | 3 |
| 2018 | 3 | 6 |
| 2019 | 6 | 1 |
| 2020 | 2 | 4 |
| 2021 | 3 | 4 |
| 2022 | 3 | 2 |
| 2023 | 2 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Drill bit for boring earth and other hard materials27 May 2025US 12,312,868 B2Ulterra Drilling Technologies, L.P.
- Multidirectional auger bit22 Oct 2024US 12,123,263 B2Metal Tool Inc.
- Auger bit24 Oct 2023US 11,795,765 B2Metal Tool Inc.
- Cutting elements with increased curvature cutting edges28 Feb 2023US 11,591,858 B2Beijing Huamei, Inc.
- Drill bit for boring earth and other hard materials20 Dec 2022US 11,530,577 B2Ulterra Drilling Technologies, L.P.
- Cutting inserts for use in a downhole bit and methods therof11 Jun 2026US 2026/0160136 A1Schlumberger Technology Corporation
- Rotating bit with integral washer feature12 Mar 2026US 2026/0071647 A1The Sollami Company
- Multidirectional auger bit23 Mar 2023US 2023/0091613 A1Metal Tool Inc.
- Auger bit21 Jul 2022US 2022/0228445 A1Metal Tool Inc.
- Drill bit for boring earth and other hard materials27 Jan 2022US 2022/0025712 A1Ulterra Drilling Technologies, L.P.
Most cited
By later US patents
- Drill bit148US 4,373,593 AChristensen, Inc. · 1983
- Methods of manufacturing gradient composite metallic structures146US 4,398,952 AReed Rock Bit Company · 1983
- Sintered and forged article, and method of forming same145US 4,484,644 AIngersoll-Rand Company · 1984
- Drill bit with cemented carbide inserts136US 4,951,762 ASandvik AB · 1990
- Cutter head for pit-boring machine116US 4,448,269 AHitachi Construction Machinery Co., Ltd. · 1984