E21B 31/1075
Using explosives
Official title: {using explosives}
E21B31/1075 (Using explosives) appears on 20 US grants and 12 published applications in this corpus.
Search patents in E21B- Granted patents
- 20
- Published applications
- 12
- Assignees
- 15
- Inventors
- 33
- Latest grant
- 8 Jun 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 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 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 1 |
| 2018 | 0 | 5 |
| 2019 | 3 | 2 |
| 2020 | 3 | 1 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Downhole impact apparatus8 Jun 2021US 11,028,660 B2Impact Selector International, LLC
- Downhole impact apparatus4 Aug 2020US 10,731,431 B2Impact Selector International, LLC
- Downhole disconnect tool2 Jun 2020US 10,669,799 B2Impact Selector International, LLC
- Mini-severing and back-off tool with pressure balanced explosives21 Jan 2020US 10,538,984 B2W.T. Bell International, Inc.
- String shot back-off tool with pressure-balanced explosives26 Mar 2019US 10,240,421 B2
- Method and apparatus for performing a survey of tubing which is stuck in a borehole, e.g. for determining a free point14 May 2020US 2020/0149390 A1Altus Intervention (Technologies) AS
- Downhole Impact Apparatus5 Dec 2019US 2019/0368296 A1Impact Selector International, LLC
- Mini-Severing And Back-Off Tool With Pressure Balanced Explosives14 Feb 2019US 2019/0048676 A1W.T. Bell International, Inc.
- Downhole Apparatus15 Nov 2018US 2018/0328133 A1Impact Selector International, LLC
- Downhole tools having controlled degradation and method4 Oct 2018US 2018/0283141 A1Baker Hughes Incorporated
Most cited
By later US patents
- Back-off apparatus and method for retrieving pipe from wells79US 4,007,790 A1977
- Back-off tool43US 4,537,255 AJet Research Center, Inc. · 1985
- Downhole mobility and propulsion apparatus37US 4,624,306 ATraver Tool Company · 1986
- Well tubing drain26US 3,981,360 ACook Testing Co. · 1976
- Well drilling tool14US 4,431,053 ATexaco Inc. · 1984