E21B 21/012
Using exhaust air from the drilling motor for blowing off the dust
Official title: {using exhaust air from the drilling motor for blowing off the dust at the borehole entrance}
E21B21/012 (Using exhaust air from the drilling motor for blowing off the dust) appears on 4 US grants and 2 published applications in this corpus.
Search patents in E21B- Granted patents
- 4
- Published applications
- 2
- Assignees
- 3
- Inventors
- 4
- Latest grant
- 21 Sep 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 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 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Composition comprising an alkoxylated amine compound and a carboxylic acid compound, use thereof in water in oil emulsions and process using the composition as or as part of a drilling fluid21 Sep 2021US 11,124,688 B2Sasol Chemicals GmbH
- Composition comprising an alkoxylated amine compound and a carboxylic acid compound, use thereof in water in oil emulsions and process using the composition as or as part of a drilling fluid6 Mar 2018US 9,909,049 B2Sasol Performance Chemicals GmbH
- Mine dusting machine28 Apr 2015US 9,016,466 B1
- Sealant system for roof drilling apparatus27 Nov 1979US 4,175,757 AFansteel Inc.
- Composition Comprising an Alkoxylated Amine Compound and a Carboxylic Acid Compound, Use Thereof in Water in Oil Emulsions and Process Using the Composition as or as Part of a Drilling Fluid6 Sep 2018US 2018/0251667 A1Sasol Chemicals GmbH
- Composition Comprising an Alkoxylated Amine Compound and a Carboxylic Acid Compound, use thereof in Water in Oil Emulsions and Process Using the Composition as or as Part of a Drilling Fluid15 Jan 2015US 2015/0014062 A1Sasol Performance Chemicals GmbH
Most cited
By later US patents