E21B 1/38
Hammer piston type, i.e. in which the tool bit or anvil is
Official title: Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
E21B1/38 (Hammer piston type, i.e. in which the tool bit or anvil is) appears on 83 US grants and 71 published applications in this corpus.
Search patents in E21B- Granted patents
- 83
- Published applications
- 71
- Assignees
- 49
- Inventors
- 148
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 5 |
| 2010 | 1 | 3 |
| 2011 | 4 | 2 |
| 2012 | 1 | 1 |
| 2013 | 0 | 4 |
| 2014 | 2 | 4 |
| 2015 | 3 | 2 |
| 2016 | 3 | 7 |
| 2017 | 4 | 3 |
| 2018 | 4 | 7 |
| 2019 | 8 | 1 |
| 2020 | 3 | 6 |
| 2021 | 7 | 2 |
| 2022 | 5 | 6 |
| 2023 | 5 | 3 |
| 2024 | 3 | 6 |
| 2025 | 7 | 2 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Drill bit assembly for reverse circulation hammer2 Jun 2026US 12,644,338 B2Mincon International Limited
- Producing hydro-efflux hammer using catalyst-free PDC cutters5 May 2026US 12,617,015 B2Saudi Arabian Oil Company
- Down-the-hole hammer with ported piston and flow control valve21 Apr 2026US 12,607,069 B2Caterpillar Inc.
- Valve-controlled high-energy hydrostatic down-the-hole impact hammer23 Dec 2025US 12,503,915 B2Southwest Petroleum University
- Valve cylinder, impact device and method2 Sep 2025US 12,404,725 B2Sandvik Mining and Construction Oy
- Producing hydro-efflux hammer using catalyst-free pdc cutters20 Aug 2026US 2026/0241447 A1Saudi Arabian Oil Company
- Drill string apparatus11 Jun 2026US 2026/0160132 A1
- Hydraulic Hammering Device7 May 2026US 2026/0125951 A1Furukawa Rock Drill Co., Ltd.
- Drill bit assembly for reverse circulation hammer7 Aug 2025US 2025/0250862 A1Mincon International Limited
- Valve cylinder, impact device and method23 Jan 2025US 2025/0027368 A1Sandvik Mining and Construction Oy
Most cited
By later US patents
- Automatic drive hammer system and method for use thereof29US 4,993,500 AMobile Drilling Company, Inc. · 1991
- Back driving automatic hammer23US 6,003,619 A1999
- Hand-held hammer tool22US 4,766,963 AInstitut Cerac S. A. · 1988
- Liquid inertia tool19US 4,484,638 A1984
- Apparatus for water jet and impact drilling and mining17US 4,319,784 AConzinc Riotinto Malaysia Sendirian Berhard · 1982